Answers
Answer:
Oxygen 17 isotope with neutral charge
Explanation:
The atom has 8 red protons and 8 black electrons so it is neutral. Since it has 8 protons, it has atomic number of 8, which is oxygen (O).
There are 9 blue neutrons. The mass number = #protons + #neutron = 8 + 9 = 17. Therefore it is the oxygen 17 isotope.
Related Questions
Describe metallic bonding. In your answer, state two common properties of metals, and explain how metallic bonding produces these properties.
Answers
ANSWER : Metallic bonding is a type of chemical bonding that occurs between metal atoms. It involves the sharing of valence electrons between metal atoms, resulting in a sea of electrons that surrounds a lattice of positively charged metal ions.
Two common properties of metals are malleability and conductivity. Malleability refers to the ability of a metal to be shaped into thin sheets without breaking, while conductivity refers to the ability of a metal to conduct electricity and heat.
Metallic bonding produces these properties because the sea of delocalized electrons is free to move throughout the lattice of metal ions. When a force is applied to a metal, the ions in the lattice can slide past each other, facilitated by the movement of these electrons. This ability to move and slide past each other is what gives metals their malleability.
Similarly, the delocalized electrons are able to carry an electric current through the metal lattice. As electrons move through the metal lattice, they collide with the metal ions, transferring energy and producing heat. This transfer of energy is what gives metals their high thermal conductivity. In addition, the delocalized electrons are also able to transfer electrical charge through the metal lattice, resulting in the high electrical conductivity observed in metals.
In summary, metallic bonding produces the properties of malleability and conductivity in metals by creating a sea of delocalized electrons that can move freely throughout the lattice of metal ions, allowing for the movement of ions and the transfer of energy and electrical charge.
Explanation :
there you go home this helps :)
Calculate the number of moles of Cu in 1.25x10^25 atoms of Cu
Answers
Answer: 1.25.173.
Explanation:just caluate
Write a summary paragraph discussing this experiment and the results. Use the following questions to help guide the content of your paragraph.
What was your hypothesis? According to your data, was your hypothesis was correct?
Why did some substances require larger additions before a color change was seen? What does this indicate about the strength of the acid or base?
What happened in the final step of the experiment? What does the final color indicate?
To what extent was this experiment useful in determining pH? Could a specific pH be determined using this procedure?
Why are acid and base indicators important? How could they be used in everyday life?
Answers
Answer:
The experiment tested the pH levels of various substances by using universal indicator and observing the color change. The hypothesis was that substances with a pH closer to 7 would require smaller amounts of indicator for a color change compared to substances with more extreme pH levels. The data collected supported this hypothesis, as substances with pH closer to 7 required smaller amounts of indicator. This indicates that the strength of the acid or base affects the amount of indicator needed for a color change. In the final step of the experiment, the universal indicator was added to a substance until the color stabilized, indicating the pH level. The final color observed indicates the pH level of the substance. While this experiment is useful in determining the approximate pH level of a substance, it cannot determine a specific pH. Acid and base indicators are important as they allow us to determine the pH level of a substance, which can be useful in everyday life, such as in pool maintenance or testing the acidity of soil for gardening.
Explanation:
Answer:
A hypothesis states your predictions about what your research will find. It is a tentative answer to your research question that has not yet been tested. For some research projects, you might have to write several hypotheses that address different aspects of your research question. Some substances work only for strong bases or weak bases or strongs acids. Example, if you have a weak base solution (pH=8) and you add phenolphthalein, then you need a lot of phenolpthalein drops to see a pink color change because phenolphthalein is for stronger bases 1. liquids such as lemonade clear soda and the clear shampoo would be acidic where as the baking soda dish soap and fertilizer would be basic, my hypothesis was somewhat correct all but the soda was correct by the looks of the colors.2. Some liquids required more because the strength of the acidity or base wasn't very strong thus requiring a larger amount of liquid added to the cabbage indicator.3. At the end of the experiment when the vinegar and baking powder were added together the colors mixed into a mix of the two more purple then the cabbage indicator and there was plenty of bubbles in the solution.4. Not very useful unless you know exactly what the colors indicate. Yes, all that would be needed is a ph scale.5. Acids and base indicators help us identify whether a substance is acidic or basic. They can be used to detect the nature of soil, samples etc which can be helpful.Acid-base indicators are most often used in a titration to identify the endpoint of an acid-base reaction. They are also used to gauge pH values and for interesting color-change science demonstrations.Find the ΔHr0 for the reaction : 2HCl(aq) + Ca(OH)2(s) → CaCl2(s) + 2H2O(l)
Answers
The standard enthalpy change of reaction for the given reaction is -46.9 kJ/mol. Since the enthalpy change is negative, it indicates that the reaction is exothermic and releases energy in the form of heat.
What is Enthalpy?
Enthalpy (H) is a thermodynamic property that describes the total heat content of a system at constant pressure. It is a measure of the internal energy of a system, which includes the energy required to create or destroy the system as well as the energy required to maintain its temperature and pressure.
The standard enthalpy change of reaction (ΔHr0) can be determined using the standard enthalpies of formation (ΔHf0) of the reactants and products.
2HCl(aq) + Ca(OH)2(s) → CaCl2(s) + 2H2O(l)
The standard enthalpy change of reaction can be calculated using the following equation:
ΔHr0 = Σ(nΔHf0(products)) - Σ(nΔHf0(reactants))
ΔHf0(HCl(aq)) = -167.2 kJ/mol
ΔHf0(Ca(OH)2(s)) = -986.1 kJ/mol
ΔHf0(CaCl2(s)) = -795.8 kJ/mol
ΔHf0(H2O(l)) = -285.8 kJ/mol
Substituting the values into the equation, we get:
ΔHr0 = [2(ΔHf0(H2O(l))) + ΔHf0(CaCl2(s))] - [2(ΔHf0(HCl(aq))) + ΔHf0(Ca(OH)2(s))]
ΔHr0 = [2(-285.8 kJ/mol) + (-795.8 kJ/mol)] - [2(-167.2 kJ/mol) + (-986.1 kJ/mol)]
ΔHr0 = (-571.6 kJ/mol - 795.8 kJ/mol) - (-334.4 kJ/mol - 986.1 kJ/mol)
ΔHr0 = -1367.4 kJ/mol + 1320.5 kJ/mol
ΔHr0 = -46.9 kJ/mol
Therefore, the standard enthalpy change of reaction for the given reaction is -46.9 kJ/mol. Since the enthalpy change is negative, it indicates that the reaction is exothermic and releases energy in the form of heat.
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Calculate the number of moles of Cu
( nCu
) in 2.2×1021
atoms of Cu
Answers
We can use this value to convert the given number of atoms of copper to moles of copper:
nCu = (2.2 x 10^21 atoms) / (6.022 x 10^23 atoms/mol)
nCu = 3.65 x 10^-3 mol
Therefore, there are approximately 3.65 x 10^-3 moles of copper (Cu) in 2.2 x 10^21 atoms of copper.
What is Avogadro's number?The Avogadro number, also known as Avogadro's constant, is a fundamental physical constant representing the number of particles (usually atoms or molecules) in one mole of a substance. It is defined as exactly 6.02214076 × 10^23 particles per mole.
What is the role of Avogadro's Number?The Avogadro number plays an important role in chemistry, physics, and other sciences that deal with the properties and behavior of matter at the atomic and molecular scale. It is used to convert the mass of a substance and the number of particles it contains and to determine the number of atoms or molecules involved in chemical reactions.
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what is the iupac name for the following compound? question 20 options: heptaneA. hexaneB. heptaneC. octaneD. nonane
Answers
Answer:
what is the IUPAC name for the following compound? question 20 options: heptane A. hexane B. heptane C. octane D. nonane
C. Octane
Explanation:
A solution of sodium acetate (NaCH3COO) has a pH of 9.41. The acid-dissociation constant for acetic acid is 1.8×10−5. What is the molarity of the solution?
Answers
Answer: The equation of the dissociation of the solution is given below:NaCH3COO -----> CH3COO- + Na+HA -----> A- + H+Using the equation of dissociation constant, Ka:Ka = [A-][H+]/[HA][H] = [A-][H+] = 10^-(pH)[H+] = 10^-9.44[H+] = 3.63 × 10^-10 MThus, [A-] = 3.63 × 10^-10 M[HA] = [A-][H+]/Ka[HA] = (3.63 × 10^-10 M)^2 / 1.8 × 10^-5[HA] = 7.32 × 10^-15 M
Therefore, the molarity of the sodium acetate (NaCH3COO) solution is 7.32 × 10^-15 M.
Explanation:
Type your answer here:
Table 1. Measurements Taken from a Simulation of a [insert mass value] kg Ball Released from Various Heights on a Ramp
Mass of ball (kg) Drop height on-ramp (m) Potential energy (J) Time to travel 1.0 m (s) Speed (m/s) Kinetic energy (J)
0.5
1.0
1.5
2.0
2.5
3.0
Conclusions
1. What conclusions can you draw about how the amount of potential energy stored in a system changes as a ball is placed at varying heights on a ramp? Write an evidence-based claim.
Type your answer here:
2. What conclusions can you draw about how the final kinetic energy of a ball in a system changes as a ball is placed at varying heights on a ramp? Write an evidence-based claim.
Type your answer here:
3. Develop a model (diagram) that shows how different amounts of gravitational potential energy (GPE) are stored in the earth-ball system when the ball is raised to different heights on the ramp.
Type your answer here:
4. How did you use what you learned from the first part of the experiment to design a marble run?
Type your answer here:
Answers
I used the results from the first part of the experiment to design a marble run by understanding the principles of potential and kinetic energy.
What is kinetic energy?Kinetic energy is the energy of motion. It is the energy an object has due to its motion. When an object is moving, it has kinetic energy. This energy is dependent on the mass of the object and its velocity. Kinetic energy can be calculated by multiplying the mass of the object by the square of its velocity and then dividing the result by two. Kinetic energy is one of the two main types of energy, along with potential energy. It has the ability to cause change within a system, such as breaking chemical bonds. When an object is at rest, it does not have kinetic energy. However, as soon as it begins to move, it acquires kinetic energy. Kinetic energy can be changed or transferred from one object to another, or from one form to another.
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Which of these is an example of an agricultural use for radiation?
A. making heavy isotopes to find new elements.
B. irradiating wheat to kill fungus.
C. diagnostic procedures that image inside the body, such as a PET scan.
D. locating leaks in a water line in a building.
Answers
An example of an agricultural use for radiation is option B which is irradiating wheat to kill fungus is an example of an agricultural use for radiation.
Radiation in agriculture explained.Radiation in agriculture refers to the use of various forms of ionizing radiation (such as gamma rays, X-rays, and electron beams) for agricultural purposes. This includes using radiation to improve crop yield and quality, preserve food, and control pests and diseases. Radiation can also be used to induce mutations in plants, which can lead to the development of new varieties with desirable traits such as increased yield, disease resistance, and drought tolerance. Additionally, radiation can be used to sterilize soil and agricultural products, such as spices and herbs, to eliminate harmful pathogens and pests. Overall, the use of radiation in agriculture has the potential to improve food safety, increase productivity, and reduce waste in the agricultural industry.
Therefore, radiation can be used to kill harmful organisms such as fungi and bacteria that can cause disease and spoilage in crops, as well as to improve breeding and seed production in plants.
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Lithium has an atomic mass of 6.941 amu. Lithium has two common isotopes.
Answers
Lithium has an atomic mass of 6.941 amu. Lithium has two common isotopes as lithium-6 and lithium-7.
What are isotopes?
Isotopes are the elements which have same atomic number but different mass number. For example - Carbon has three isotopes- C-12, C-13, C-14. If an element is found to have different isotopes in nature then it’s average atomic mass can be calculated as
Average atomic mass = (m×a + n×b) / (m+n)
Where a = Atomic mass of isotope A of element X
b = Atomic mass of isotope B of element X
A and B are present in m:n ratio in nature.
Therefore, Lithium has an atomic mass of 6.941 amu. Lithium has two common isotopes as lithium-6 and lithium-7.
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Water has a specific heat of 4.184 J/g°C. If the temperature of 250 g of
water changes from 22.9°C to 14.7°C, how much heat energy was removed
from the water?
Answers
Q = m x c x ΔT
where Q is the amount of heat energy in Joules (J), m is the mass of the water in grams (g), c is the specific heat capacity of water in J/g°C, and ΔT is the change in temperature in °C.
In this case, we have:
m = 250 g
c = 4.184 J/g°C
ΔT = 22.9°C - 14.7°C = 8.2°C (note that the temperature change is negative because the water is losing heat)
Substituting these values into the formula:
Q = 250 g x 4.184 J/g°C x (-8.2°C)
Q = -8,188.4 J
The negative sign indicates that heat energy was removed from the water (as opposed to added). Therefore, 8,188.4 J of heat energy was removed from the water.
An object that is at rest will begin to move if which of the following is true?
The surface on which it rests is frictionless.
The mass of the object is sufficient.
Gravity on the object can be reduced.
Unbalanced forces act on the object.
Answers
Answer:
D. Unbalanced forces act on the object
Explanation:
Newton's First Law of Motion states that an object at rest will remain at rest unless acted on by an outside force.
the object will begin to move when unbalanced forces act on it
Explanation:
Newton's first law of motion states that 'a body or an object will continue to be in its state of rest until it's acted upon by an external force'
Please put the steps in order from 1-5 first correct answer gets Brainliest.
Answers
5. This energy is released with wavelengths and frequencies within the visible portion of the electromagnetic spectrum.
3. The excited state is not a stable configuration for the atom because there are lower energy
sublevels not filled, so e' eventually fall back to original energy levels (ground state)
1. Electrons start in the most stable arrangement, called the ground state
2. Electrons absorb energy from heat or electricity and move to a higher energy level, this is called the excited state
4. When they fall back, the electrons have to release the energy absorbed to
move to the excited state.
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classification, dietry source,biochemical function and specific deficiency disease of vitamins
Answers
Answer:
Vitamins are essential organic compounds that are required in small amounts to maintain various physiological processes in the human body. They are classified into two groups: fat-soluble vitamins (A, D, E, and K) and water-soluble vitamins (B-complex vitamins and vitamin C).
The dietary sources and biochemical functions of each vitamin are as follows:
Vitamin A - Found in liver, fish, eggs, and dairy products. It is required for vision, immune function, and growth.
Vitamin D - Found in fatty fish, eggs, and fortified dairy products. It is required for bone health and helps the body absorb calcium.
Vitamin E - Found in nuts, seeds, and vegetable oils. It acts as an antioxidant and helps protect cells from damage.
Vitamin K - Found in green leafy vegetables and certain fruits. It is required for blood clotting.
B-complex vitamins - Found in meat, fish, poultry, whole grains, and fortified cereals. They play various roles in energy production, nervous system function, and red blood cell formation. Examples include:
Vitamin B1 (Thiamine) - Required for energy production and nerve function. Deficiency can cause beriberi.
Vitamin B2 (Riboflavin) - Required for energy production and cell growth. Deficiency can cause skin and eye disorders.
Vitamin B3 (Niacin) - Required for energy production and proper digestion. Deficiency can cause pellagra.
Vitamin B5 (Pantothenic Acid) - Required for energy production and hormone synthesis. Deficiency is rare.
Vitamin B6 (Pyridoxine) - Required for protein metabolism and immune function. Deficiency can cause anemia and neurological problems.
Vitamin B7 (Biotin) - Required for energy production and proper metabolism. Deficiency is rare.
Vitamin B9 (Folate) - Required for cell growth and development. Deficiency can cause anemia and birth defects.
Vitamin B12 (Cobalamin) - Required for nerve function and DNA synthesis. Deficiency can cause anemia and neurological problems.
Vitamin C - Found in citrus fruits, strawberries, kiwi, and bell peppers. It acts as an antioxidant and is required for collagen synthesis. Deficiency can cause scurvy.
In summary, vitamins are essential nutrients required for a range of functions in the body. They can be obtained through a balanced diet, and deficiency of any vitamin can lead to various health problems.
Explanation:
Calculate the number of moles of C2H6
(nC2H6
) in 7.93×1023
molecules of C2H6
Answers
According to the mole concept, there are 1.316 moles of ethane in 7.93×10²³ molecules of ethane.
What is a mole?Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.
It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.
Number of moles=number of molecules/Avogadro's number= 7.93×10²³/6.023×10²³=1.316
Thus, there are 1.316 moles of ethane in 7.93×10²³ molecules of ethane.
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Which of these is an example of an agricultural use for radiation?
A. making heavy isotopes to find new elements.
B. irradiating wheat to kill fungus.
C. diagnostic procedures that image inside the body, such as a PET scan.
D. locating leaks in a water line in a building.
Answers
Irradiating wheat to kill fungus is an example of an agricultural use for radiation.
option B.
What is irradiation?Irradiation of agricultural products is a process in which ionizing radiation (such as gamma rays or electron beams) is used to eliminate harmful organisms such as bacteria, viruses, fungi, and insects that may be present in the products. The process involves exposing the product to a controlled dose of radiation, which kills or sterilizes the harmful organisms without significantly affecting the quality, taste, or nutritional value of the product.
Thus, irradiation can be used to eliminate pests and diseases in agricultural products, including grains, fruits, and vegetables. Irradiation of wheat can be used to eliminate fungi, insects, and other harmful organisms, improving the shelf life and quality of the product.
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A balloon filled with exhaled air has a volume of 16.0 L at 1.08 atm. If the balloon is perfectly elastic, what is the volume of the balloon if it is taken into the mountains where the pressure is is 0.877 atm and the temperature is the same.
Answers
Answer:
be at a pressure of 0.987 atm if the temperature remains constant? P, V₁ = P2 V2 ... A helium-filled balloon has a volume of 50.0L at 25.0°C and 1.08atm.
Explanation:
right
What is pasteurisation
Answers
Castration is the method of storing milk there was discovered by Louis Pasteur
Explanation:
Castration is the method of storing milk there was discovered by Louis Pasteur
the partial sterilization of a product, such as milk or wine, to make it safe for consumption and improve its keeping quality.
Find the rate law of the experiment if the slope is 13.091 ml/s. And the equation is rate=k[h2o2][I^-]^y
Answers
The rate law of the experiment is rate = k[H2O2][I-]y, where k is the rate constant, H2O2 is the concentration of hydrogen peroxide, I- is the concentration of iodide ion, and y is the reaction order with respect to iodide ion.
What is hydrogen peroxide?Hydrogen peroxide is a compound made up of two hydrogen atoms and two oxygen atoms (H2O2). It is a colorless, odorless liquid that is slightly more viscous than water and is a strong oxidizing agent. Hydrogen peroxide is highly reactive and is commonly used as a bleaching agent, disinfectant, and antiseptic. It can also be used as a fuel, oxidizer, and propellant. In the environment, hydrogen peroxide is formed naturally by the breakdown of organic matter, such as plants and animals, and is found in rain and snow.
The slope of the experiment, 13.091 ml/s, is equal to k[H2O2]y. Since the slope is 1, the rate law is rate = k[H2O2][I-]1, which means the reaction is first order with respect to iodide ion.
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Zn + 2HCI H2 + ZnCI2 caculate the grams of zinc chloride produced if .236 grams of zinc react completely
Answers
The grams of zinc chloride produced if .236 grams of zinc react completely is 0.492 grams
Grams calculation
The balanced chemical equation for the reaction is:
Zn + 2 HCl → H2 + ZnCl2
The molar mass of Zn is 65.38 g/mol and the molar mass of ZnCl2 is 136.29 g/mol.
To calculate the grams of zinc chloride produced, we first need to find the number of moles of zinc used in the reaction:
moles of Zn = mass of Zn / molar mass of Zn
moles of Zn = 0.236 g / 65.38 g/mol
moles of Zn = 0.00361 mol
From the balanced chemical equation, we can see that the stoichiometric ratio of Zn to ZnCl2 is 1:1. This means that 0.00361 mol of Zn will produce 0.00361 mol of ZnCl2.
To calculate the mass of ZnCl2 produced, we can use the following equation:
mass of ZnCl2 = moles of ZnCl2 x molar mass of ZnCl2
mass of ZnCl2 = 0.00361 mol x 136.29 g/mol
mass of ZnCl2 = 0.492 g
Therefore, if 0.236 grams of zinc react completely, 0.492 grams of zinc chloride will be produced.
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100 POINTS I JUST NEED THE CONCLUSION THE OTHER STUFF IS THIER FOR YOU TO USE TO FIGURE OUT THE ANSWER
Properties of Light Lab Report
Instructions: In the Properties of Light—Bending Light Lab you will explore how light rays interact as they pass from one material, or medium, to another. Record your observations in the lab report below. You will submit your completed report.
Name and Title: jenna davis, Mrs.sipe, 3/2/23, 05.02
Include your name, instructor's name, date, and name of lab.
Objective(s):
In your own words, what was the purpose of this lab?
The purpose is to see how light bends in different circumstances.
Hypothesis:
In this section, please include the if/then statement you developed during your lab activity. This statement reflects your predicted outcome for the experiment.
If I project light rays through (choose one: air, water, glass), then they will refract, or bend, the most.
Procedure:
Please be sure to identify the test variable (independent variable) and the outcome variable (dependent variable) for this investigation. Remember, the test variable is what is changing in this investigation. The outcome variable is what you are measuring in this investigation.
Test variable (independent variable):
Outcome variable (dependent variable):
Select Intro to begin.
Once the simulation loads, you will drag the protractor onto the screen so that the 0 lines up with the dotted line in the center of the screen. Select the More Tools icon at the bottom of the lab interactive and be sure to select the Normal and Angles boxes. Do Not move the laser light.
You will test all three materials in the bottom, blue half of the screen: air, water, and glass. Remember, do not move the laser light.
Record your observations of how the light rays interact as they pass from air, on the top of the screen, through the three materials on the bottom of the screen
Data:
Record the data from each trial in the data chart below. Be sure to fill in the chart completely.
Material
Interactions
List any observations you made as the light rays passed from the air on the top of the screen to the selected material on the bottom of the screen.
Evidence
Using the protractor, measure the angle as the light passes from the top material to the bottom material on the screen. Also, note the index of refraction for each as indicated on the screen.
Trial One
Air on top
Laser keeps going straight
Bottom angle: 45
Bottom index of refraction:1.00
Air on bottom
The light is reflected
Trial Two
Air on top
The light is refracted
Bottom angle:31
Bottom index of refraction:1.33
Water on bottom
The reflected ray is dimmer
Trial Three
Air on top
The light is reflected
Bottom angle:29
Bottom index of refraction:1.50
Glass on bottom
The light is refracted
The reflected ray is dimmer
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please write in complete sentences.
Did your data support your hypothesis? Use evidence to explain.
Which material refracted the light rays the most: air, water, or glass?
Which material refracted the light rays the least: air, water, or glass?
How does density affect refraction?
Diamonds are a very dense material. Predict what would happen to the light ray if you projected it from air through a diamond.
Explain where you observe reflection, refraction, and absorption of light in your everyday activities.
Answers
Answer:
Conclusion:
The purpose of this lab was to observe how light rays interact as they pass from one material to another. The hypothesis stated that if light rays are projected through a material, they will refract the most. The data collected in this lab supports the hypothesis. When light rays were projected through air onto the different materials, they either refracted or reflected. The angle of refraction was measured for each material and it was found that the angle decreased as the index of refraction increased.
Water refracted the light rays the most while air refracted the least. The density of a material affects refraction because it changes the speed at which light travels through the material. A more dense material causes light to travel slower and bend more, leading to greater refraction. If light was projected through a diamond, it would refract significantly due to the high density of diamond.
Reflection, refraction, and absorption of light can be observed in many everyday activities. Reflection can be seen in mirrors, windows, and other reflective surfaces. Refraction can be observed when light passes through a lens or prism, causing the light to bend and create a spectrum of colors. Absorption can be seen when certain colors of light are absorbed by objects, making them appear a different color.
Using a 500 mL beaker, a teacher stirred sugar into some water. The sugar seemed to disappear during the stirring process. The beaker was then placed on the teacher’s demonstration desk. A few days later all of the water evaporated, and sugar appeared in the bottom of the beaker. Which is the best evidence that no chemical reaction occurred? A.All the sugar evaporated. B.Sugar combined with water to form a new substance. C.Sugar is still in the beaker. D.All the sugar dissolved faster due to stirring by the teacher.
Answers
The best evidence that no chemical reaction occurred in the process described is that the sugar is still in the beaker after the water has evaporated. Therefore, the correct answer is C.
What is a chemical reaction?The chemical, known as the reactant, is changed into a new substance, the product, during a chemical reaction. Here, the atoms that make up the reactants are rearranged to form products. This is an irreversible process.
In the process described in the question, sugar was simply dissolved in water to form a sugar-water solution. This is a physical change, not a chemical change, because the sugar molecules remained intact and did not undergo a chemical reaction with the water molecules. The sugar molecules were simply dispersed throughout the water, making them invisible to the eye.
When the water evaporated, the sugar molecules were left behind and re-crystallized in the bottom of the beaker. This process did not involve a chemical reaction, only a physical change.
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A 550.0 mL sample of gas at 40.0 °C and 895 torr is transferred to a second vessel where the temperature is 0.0 °C and the pressure is 745 torr. What is the volume of the second vessel?
Answers
The volume of the second vessel is approximately 450 mL. In physics and chemistry, pressure is an important concept that is used to describe the behavior of gases, liquids, and solids under different conditions.
What is Pressure?
It is a scalar quantity and is expressed in units such as pascals (Pa), pounds per square inch (psi), atmospheres (atm), or torr. Pressure is created by the collision of particles (atoms or molecules) with the walls of a container, and it can be influenced by factors such as temperature, volume, and the number of particles present.
The first step is to use the combined gas law to relate the initial conditions to the final conditions:
(P1V1)/T1 = (P2V2)/T2
where P is pressure, V is volume, and T is temperature, with subscripts 1 and 2 representing the initial and final conditions, respectively.
Plugging in the given values, we get:
(895 torr)(550.0 mL)/(313.15 K) = (745 torr)(V2)/(273.15 K)
Solving for V2, we get:
V2 = (895 torr)(550.0 mL)/(313.15 K) * (273.15 K)/(745 torr) ≈ 450 mL
Therefore, the volume of the second vessel is approximately 450 mL.
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A sample of potassium (K, found in Group 1) and a sample of iodine (I, found in Group 17) react, forming potassium iodide (KI), which is used to treat thyroid conditions. Complete the statements to describe this reaction. The reaction occurs because electrons are pulled away from the more | less electronegative element by the more | less electronegative element. The more electronegative element is found in Group 1 [ Group 17. The less electronegative element is found in Group 1 Group 17.
Answers
The words that complete the blanks are;
1) Less
2) More
3) Group 17
4) Group 1
What is electronegativity?Electronegativity is a measure of an atom's ability to attract electrons towards itself when it forms a chemical bond with another atom. It is a relative property, meaning that it is determined by comparing the electronegativities of two or more elements.
Electronegativity values are typically determined on a scale of 0 to 4, with 4 being the highest electronegativity value. Fluorine, the most electronegative element, has an electronegativity value of 4.0, while other elements have values that are lower than 4.0.
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A gaseous compound has a density of 1.50 g/L
at 27.1 °C
and 1.34 atm.
What is the molar mass of the compound?
Answers
Answer:
To find the molar mass of a gaseous compound given its density, temperature, and pressure, we can use the ideal gas law and the definition of density.
The ideal gas law is PV = nRT, where P is the pressure of the gas, V is the volume, n is the number of moles of the gas, R is the gas constant, and T is the temperature of the gas in Kelvin.
We can rearrange this equation to solve for the number of moles, n:
n = PV/RT
The density of a gas, d, is defined as the mass of the gas divided by its volume:
d = m/V
where m is the mass of the gas.
We can use the molar mass of the gas, M, to relate the mass of the gas to the number of moles:
m = nM
Combining these equations, we can solve for the molar mass of the gas:
M = m/n = (dV)/n = (dVRT)/P
Plugging in the given values, we get:
M = (1.50 g/L) x (0.08206 L·atm/mol·K) x (300.1 K) / (1.34 atm)
M = 64.4 g/mol
Therefore, the molar mass of the gaseous compound is approximately 64.4 g/mol.
Explanation:
How many moles of Argon are present in 11.2 grams of argon gas?
Answers
Answer:
0.280 moles
Explanation:
We can convert from grams to moles through molar mass.
Stoichiometry
Stoichiometry is the study of the relationship between quantities of substances. Part of stoichiometry is converting between different quantity measurements such as grams (g) and moles (mols).
One way to convert between g and mols is molar mass. Molar mass is the number of grams in one mole of a substance. Molar mass is a constant that can be found on periodic tables.
Conversion
First, we need to look at a periodic table and find that the molar mass of Argon (Ar) is 39.948 g/mol. To convert between units, set up a multiplication problem where the unwanted units (grams in this case) are in the numerator at one point and then in the denominator. Having the units in opposite positions allows the units to cancel out.
[tex]\frac{11.2g}{1} *\frac{1mol}{39.948g} =0.280mol[/tex]So, there are 0.280 moles of Argon in 11.2 grams. Note that this answer has been rounded according to significant figures rules.
An initial sample of iridium-192 is prepared pure, with no contamination of other isotopes. After a certain amount of time, one finds that the sample includes 4.4% osmium-192. How much time has passed since the initial sample was prepared?
Answers
Hence, 8.12 days had passed because the initial sample is made according to the isotopes.
Simply put, what is an isotope?Atoms that have the same protons and neutrons but different quantities of neutrons are called isotopes. Despite having almost equal chemical properties, they have different masses, which affects their physical characteristics.
This allows us to write: N/N0 (= 0.956 = (1/2)(t/T).
When we take the logarithmic of both sides, we obtain:
t/T*log(1/2) = log(0.956) = log(0.956)
When we solve for t/T, we get:
t/T = log(0.956)/log(1/2)=0.110
By dividing both sides by T, we can finally find t:
t = (0.110) (0.110) * T
Iridium-192 has a 73.83-day half-life. Therefore:
t = (0.110) (0.110) 8.12 days divided by 73.83 days.
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Consider the balanced equation:
2 CH4 (g) + 3 O2 (g) + 2 NH3 ---> 2 HCN (g) + 6 H2O (g)
If 203.6 g of NH3 is reacted with excess CH4 and O2, what mass in grams of HCN is produced?
Answers
The mass (in grams) of HCN produced when 203.6 g of NH₃ reacts with excess CH₄ and O₂ is 323.4 g
How do I determine the mass of HCN produced?The mass of HCN produced when 203.6 g of NH₃ reacts with excess CH₄ and O₂ can be obtained as follow:
2CH₄(g) + 3O₂(g) + 2NH₃ -> 2HCN(g) + 6H₂O(g)
Molar mass of NH₃ = 17 g/molMass of NH₃ from the balanced equation = 2 × 17 = 34 g Molar mass of HCN = 27 g/molMass of HCN from the balanced equation = 2 × 27 = 54 gFrom the balanced equation above,
34 g of NH₃ reacted to produce 54 g of HCN
Therefore,
203.6 g of NH₃ will react to produce = (203.6 × 54) / 34 = 323.4 g of HCN
Thus, the mass of HCN produced is 323.4 g
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Which of the following correctly describes delocalized valence electrons in a metal?
Group of answer choices
Valence electrons move from outer orbitals to inner orbitals of each atom.
Valence electrons move from inner orbitals to outer orbitals of each atom.
Valence electrons move between atoms in shared orbitals.
Valence elctrons move out of the orbitals and go into the air.
Answers
Valence electrons move between atoms in shared orbitals- correctly describes delocalized valence electrons in a metal
Why are valence electrons important and what do they do?
The outermost or valence shell electrons, known as valence electrons, are crucial because they shed light on an element's chemical characteristics and are the ones that are acquired, lost, or shared during a chemical reaction. In general, when an atom's outermost electron shell is complete, it is at its most stable and least reactive.
The number of valence electrons for neutral elements is the same as the number of the atom's main group. A periodic chart element's column can be used to determine its main group number. For instance, carbon, which belongs to group 4, has four external electrons.
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calculate the weight 'm' grams of 5.6L of chlorine gas cl2 at NTP.
Answers
The weight of 5.6 L of chlorine gas Cl₂ at NTP is 17.75 grams
How do i determine the weight of the chlorine gas at NTP?The volume of a gas at normal temperature and pressure, NTP, is given as
22.4 L = 1 mole of a gas
With the above information, we can obtain the weight (in grams) of the 5.6 L of chlorine gas Cl₂. This is shown below.
The following data were obtained from the question:
Volume chlorine gas, Cl₂ at NPT = 5.6 L1 mole of chlorine gas, Cl₂ = (2 × 35.5) = 71 gramsWeight of chlorine gas =?At normal temperature and pressure, NTP, the volume of chlorine gas is given as follow:
22.4 L = 1 mole of chlorine gas, Cl₂
22.4 L = 71 grams of chlorine gas, Cl₂
Therefore,
5.6 L = (5.6 L × 71 grams) / 22.4 L
5.6 L = 17.75 grams of chlorine gas, Cl₂
Thus, we can conclude from the above calculation that the weight of the gas at NTP is 17.75 grams
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