Answer:
D. 80 p+, 124 nº, 78 e-
Explanation:
The atomic number of mercury (Hg) is 80, which means it has 80 protons and 80 electrons in a neutral atom. The ion given is Hg2+ which means it has lost two electrons, so the number of electrons is now 80 - 2 = 78.
The mass number of mercury is 204, which means it has 204 nucleons in its nucleus. Since the ion is Hg2+, there are two mercury atoms present. Therefore, the total number of protons is 2 × 80 = 160, and the total number of neutrons is 204 - 160 = 44.
So the answer is D) 80 p+, 124 nº, 78 e-
Write the condensed formulas and provide IUPAC name for the following compound:
(a ethyl alcohol (in beverages)
The condensed formula and IUPAC nomenclature for the chemical ethyl alcohol are [tex]C_{2} H_{6} O[/tex].
The condensed formula approach is what?Condensed structural formulae, which conserve space and are easier and faster to type out, display the atoms' positions similarly to a structural formula but on a single line. When demonstrating how a group of atoms in a molecule are linked to a single atom, condensed structural formulae are also helpful.
How do you tell whether a formula has been compressed?The hydrogens (or other ions or groups) that are connected to the carbon atoms are immediately next to one another in condensed chemical formulations. The corners and endpoints of lines are assumed to have carbon atoms in line-angle formulae. As each carbon atom is connected to four hydrogen molecules in total, it is assumed that each one has four bonds.
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Outline why there is no limit to the number of control variables that an experiment can have.
Most experimental designs measures solely one or two variables at a time. Any different factor, which could probably impact the results, should be efficaciously controlled.
Why is it vital to restriction the number of variables in an experiment?Controlling variables is important due to the fact mild variations in the experimental set-up ought to strongly have an effect on the result being measured.
Can an scan have extra than one controlled variable explain?Controlled variables are portions that a scientist needs to remain constant. If they had been altered, it would appreciably have an effect on the experiment's results. Most experiments have extra than one controlled variable.
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Please Help Me!!
Question #81
Esters are a class of compounds that impart characteristic odor to some fruits. The ester one toy acetate, composed of carbon, hydrogen, and oxygen, has the odor of bananas. When 7.44 g of this compound undergoes complete combustion, 17.6 g CO2 and 7.22 g H2O are produced.
C2H3O2 is the empirical equation for acetate. The molar mass of acetate is 59.05 g/mol.
What is mass?Mass is the physical property of a body which measures its inertia, or its resistance to changes in its speed or direction of motion. Mass is often measured in units of kilograms, but can also be measured in other units such as pounds. Mass is different than weight, which is a measure of gravity's effect on a body. Mass is the same on all planets and in all parts of the universe, while the strength of gravity can vary.
To calculate the moles of acetate, we divide the mass of acetate by its molar mass:
7.44 g acetate / 59.05 g/mol = 0.1258 mol acetate
To calculate the moles of CO2 and H2O produced, we divide the mass
of CO2 and H2O by their molar masses:
17.6 g CO2 / 44.01 g/mol = 0.4002 mol CO2
7.22 g H2O / 18.02 g/mol = 0.4011 mol H2O
We can then compare the moles of CO2 and H2O produced with the moles of acetate:
0.1258 mol acetate = 0.4002 mol CO2 + 0.4011 mol H2O
This shows that the combustion of 7.44 g of acetate produced the expected ratio of CO2 and H2O.
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Organisms need certain types of nutrients for growth, repair, and other life processes. You get these nutrients from the foods you eat. Please list the three nutrients needed and provide at least one food source where you can find each nutrient.
sciences
Answer:
The three nutrients needed for growth, repair, and other life processes are:
Proteins: Proteins are important for building and repairing tissues in the body, as well as for producing enzymes and hormones. Good food sources of protein include chicken, fish, eggs, beans, lentils, nuts, and seeds.
Carbohydrates: Carbohydrates are the primary source of energy for the body. Good food sources of carbohydrates include whole grains, fruits, vegetables, and legumes.
Fats: Fats are important for insulation, protection, and energy storage in the body. Good food sources of healthy fats include avocados, nuts, seeds, olive oil, and fatty fish such as salmon.
Explanation:
How many grams of ammonia will be formed upon the reaction of 30.7 grams of nitrogen gas with excess hydrogen gas
Answer: 37.32
Explanation:
Nitrogen gas (N2) - 28.02 g/mol
Hydrogen gas (H2) - 2.02 g/mol
Ammonia gas (NH3) - 17.03 g/mol
Using the given mass of nitrogen gas, we can first calculate the number of moles of nitrogen gas present:
moles of N2 = mass of N2 / molar mass of N2
moles of N2 = 30.7 g / 28.02 g/mol
moles of N2 = 1.096 mol
From the balanced chemical equation, we know that one mole of nitrogen gas reacts with three moles of hydrogen gas to form two moles of ammonia gas. Since we have an excess of hydrogen gas, we can assume that all of the nitrogen gas will react to form ammonia gas. Therefore, we can calculate the number of moles of ammonia gas formed using the mole ratio from the balanced chemical equation:
moles of NH3 = (moles of N2) x (2 moles of NH3 / 1 mole of N2)
moles of NH3 = 1.096 mol x (2 mol/1 mol)
moles of NH3 = 2.192 mol
Finally, we can calculate the mass of ammonia gas formed using its molar mass:
mass of NH3 = moles of NH3 x molar mass of NH3
mass of NH3 = 2.192 mol x 17.03 g/mol
mass of NH3 = 37.32 g
A student is making a solution of sugar in water. If the student uses 0.55 moles of sugar and enough water to make 908.08 milliliters of solution, what is the molarity of the student's sugar solution?
Answer:
Molarity is defined as the number of moles of solute per liter of solution. In this problem, we are given the number of moles of sugar and the volume of the solution in milliliters. We first need to convert the volume to liters before we can calculate the molarity.
To convert milliliters to liters, we divide by 1000:
908.08 milliliters = 908.08/1000 = 0.90808 liters
Now we can use the formula for molarity:
Molarity = moles of solute / liters of solution
Plugging in the given values, we get:
Molarity = 0.55 moles / 0.90808 liters
Molarity = 0.606 M (rounded to three significant figures)
Therefore, the molarity of the student's sugar solution is 0.606 M.
Answer:
The molarity of the student's sugar solution is 0.60 M.
Explanation:
How many atoms are in 0.28 moles of Beryllium (Be)?
Answer:
To determine the number of atoms in 0.28 moles of Beryllium (Be), we need to use Avogadro's number, which is 6.022 x 10^23 atoms per mole.
First, we can calculate the number of moles of Beryllium (Be) in 0.28 moles by multiplying it by Avogadro's number:
0.28 moles x 6.022 x 10^23 atoms/mole = 1.68496 x 10^23 atoms
Therefore, there are approximately 1.68 x 10^23 atoms in 0.28 moles of Beryllium (Be).
Explanation:
A student prepares a solution by dissolving 20.0 g of aluminum chloride (AICI3) in
enough water to produce 500 mL of solution. What is the molarity of the solution?
Polici
0.160 M
0.320 M
0.080 M
0.040 M
A solution must be at a higher temperature than a pure solvent to boil. Which
colligative property can be employed to achieve this?
freezing-point depression
boiling-point elevation
vapor-pressure lowering
Which example will dissolve most slowly?
two sugar cubes
a tablespoon of ultrafine sugar
a tablespoon of table sugar
a tablespoon of coarse sugar
Answer: b
Explanation:
20.0g AlCl3/133.5715 g Alcl3 = .149732540 moles AlCl3
M=mol/L = 0.149732540/0.500=0.30
133.4515 (molar mass for AlCl3 from periodic table)
Answer:the second answer is boiling point elevation
the third answer is two sugar cubes
Explanation:
Which three observations provide the strongest evidence that the shape of Earth is a sphere
The three observations that provide the strongest evidence that the shape of Earth is a sphere are:
The curved shape of Earth's shadow on the Moon during a lunar eclipse.The fact that ships disappear over the horizon hull-first, and then gradually disappear completely.The observation of different constellations in the sky depending on the observer's location on Earth.Is the Earth really a sphere?The Earth is not a perfect sphere, but rather an oblate spheroid, meaning it is slightly flattened at the poles and bulging at the equator. This is due to the Earth's rotation, which causes the equatorial regions to bulge outwards due to centrifugal force.
However, for practical purposes, the Earth is often considered a sphere since the difference in shape is relatively small compared to its overall size.
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How do you think a magnet can causes something to move?
Answer: It's magnetic field.
Explanation: Its magnetic field causes any metal to be attracted to it. The strength of the attraction is based on how strong the field is.
Answer:
It's the weight due to gravity that it can cause something to move.
Explanation:
It is the process where strong and spatially varying magnetic fields exert forces on an object in such a way that is sufficient to counteract its weight due to gravity, allowing the object to 'float' off of the ground.
If the moon is half full on June 15, on approximately what date will it next become full? O A. June 29 O B. June 22 O C. July 14 O D. July 7 SUDIAIT
The next full moon will occur around July 14, which is answer choice C.
What is moon ?
The moon is a natural satellite of the Earth, meaning it is a celestial body that orbits the Earth. It is the fifth largest moon in the solar system and is the largest relative to the size of its host planet.
The moon is approximately one-quarter the size of the Earth and is the closest astronomical object to the Earth.
If the moon is half full on June 15, then we can determine the next full moon by adding approximately 29.5 days to June 15, which is the average length of time for the moon to complete a full cycle of phases.
So, the next full moon will occur around July 14, which is answer choice C.
Therefore, option C is the correct answer.
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Flourinated gases are made by humans and used as coolants in refrigerators and air conditioning systems. Fluorinated gas molecules have a low chemical reactivity, so they tend to stay in the atmosphere and trap heat energy. The graph below shows emissions of fluorinated gases from 1990 to 2013.
The graph supports the following statement: The use of fluorinated gases has contributed to global warming.
What role do fluorinated gases play in global warming?
Fluorinated gases, also known as F-gases, are a class of man-made gases found in a variety of industrial and commercial applications such as refrigeration and air conditioning systems, electrical equipment, and aerosol sprays. They consist of hydrofluorocarbons (HFCs), perfluorocarbons (PFCs), and sulphur hexafluoride (SF6).
F-gases are potent greenhouse gases, meaning they have a high global warming potential (GWP), which is a measure of their ability to trap heat in the atmosphere. HFCs, for example, have a GWP thousands of times greater than carbon dioxide (CO2).
F-gases contribute to global warming by trapping heat and preventing it from escaping into space when they are released into the atmosphere. The greenhouse effect causes the Earth's temperature to rise, resulting in climate change.
F-gases, in addition to having a direct impact on global warming, can indirectly contribute to climate change by encouraging the use of energy-intensive technologies such as air conditioning and refrigeration systems. Increased energy demand may result in the use of fossil fuels, which increases greenhouse gas emissions and worsens global warming.
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Calculate the mass of iron contained in 95.00 grams of iron(II) chloride.
Explanation:
Refer to pic above........
To determine the mass of iron in 95.00 grammes of iron(II) chloride, we must first determine the compound's molecular formula.
The formula for iron(II) chloride is FeCl2.FeCl2 has the following molar mass:1 x 55.845 g/mol equals 55.845 g/mol 2 x 35.45 g/mol = 70.90 g/mol Cl FeCl2 molar mass = 55.845 + 70.90 = 126.745 g/mol
We can now use the molar mass of FeCl2 to calculate the number of moles of FeCl2 contained in 95.00 grammes of the compound: The number of moles equals the mass molar mass. FeCl2 molecular weight = 95.00 g 126.745 g/mol = 0.7492 mol
Because FeCl2 contains one iron atom per molecule, the sample contains 0.7492 mol of iron. Iron mass = number of moles of Fe molar mass of Fe Iron mass = 0.7492 mol 55.845 g/mol = 41.96 g As a result, the iron mass in 95.00 grammes of iron(II) chloride is 41.96 grammes.
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what is a coefficient and give an example.
Answer:
Explanation:
In mathematics, a coefficient is a multiplicative factor in some term of a polynomial, a series, or an expression; it is usually a number, but may be any expression. When the coefficients are themselves variables, they may also be called parameters.
What makes hydrogen and methane hard to condense?
When the astronaut took this photo of Earth, what moon phase would have been visible in View from Earth?
Based on the photo provided, it appears to be a picture of the Earth as seen from space. Unfortunately, I cannot determine the phase of the Moon from this image alone as the Moon is not visible in the photo.
What are the phases of the moon ?
The phases of the Moon are the different appearances of the illuminated portion of the Moon as seen from Earth. There are eight commonly recognized phases of the Moon, which are:
New Moon, Waxing Crescent, First Quarter, Waxing Gibbous, Full Moon
Waning Gibbous, Third Quarter, Waning Crescent
The entire cycle of lunar phases takes approximately 29.5 days to complete, which is known as a lunar month.
Based on the photo provided, it appears to be a picture of the Earth as seen from space. Unfortunately, I cannot determine the phase of the Moon from this image alone as the Moon is not visible in the photo.
The phase of the Moon changes continuously over a period of approximately 29.5 days, so it would be necessary to have a separate photo of the Moon to determine its phase at the time the astronaut took this picture.
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Please help and answer this
According to the observations, work of scientist uses evidence while work of an engineer uses a practical approach.
What are observations?Observations are defined as a set of statements or facts which are recorded while conducting an experiment.Observations are made through sensing changes in the variables of the experiment.
It is specifically defined as an act of knowing or recording the changes in the variables of the experiment.Recording observations holds importance as recording observations avoid the experiment to be repeated over and over again.
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PLEASE ANSWER REALLY QUICK!!
Drag the item from the item bank to its corresponding match.
Put responses in the correct input to answer the question. Select a response, navigate to the desired input and insert the response. Responses can be selected and inserted using the space bar, enter key, left mouse button or touchpad. Responses can also be moved by dragging with a mouse.
This is to observe carefully and in detail so as to identify causes, key factors, or possible results.
This is what people do when they are searching for information. People often look in more than one location.
This is a prediction of the outcome of scientific processes based on analysis.
This is the process of steps taken in completing a task, such as a lab investigation.
We can see here that:
The cloudiest month - AprilThe coldest month - JanuaryThe hottest month - MayWhen the temperature first rose above 90 degrees - February.We see here that the bar graph will be more understandable if there is: A. Title.
Another thing that can aid in understanding the bar graph is: B. add pictures.
What is bar graph?Using rectangular bars with heights or lengths proportional to the values they represent, a bar chart or bar graph displays categorical data. Both a vertical and a horizontal bar plot are possible. A column chart is another name for a vertical bar graph.
An appropriate question to guide Sarah's research will be: C. Which fixture uses the most water in our home?
To make this a real experiment, Sarah has to do the following: D. Collect and analyze data before and after the leaks are fixed.
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A hockey puck is sitting at rest on the ice.
Determine all the forces acting on the puck.
Friction
Gravity
Normal
Drag
The friction force is the force that is created when two surfaces move against each other. The gravity force is the force of attraction between the puck and the Earth.
What is friction?Friction is the force that resists motion when two objects rub against each other. On the ice, the puck is in contact with the ice surface, creating a frictional force between the two surfaces.
Friction: Friction is the force that resists motion when two objects rub against each other. On the ice, the puck is in contact with the ice surface, creating a frictional force between the two surfaces. The frictional force is proportional to the normal force, which is the force that the ice surface exerts on the puck in the direction perpendicular to the surface.
Gravity: The force of gravity is the force that pulls the puck towards the center of the Earth. This force is always present and is directed downwards towards the ground.
Normal: The normal force is the force that the ice exerts on the puck in the direction perpendicular to the surface. This force is a reaction force to the force of gravity and is what prevents the puck from sinking into the ice.
Drag: Drag is the force created by the air resistance from the air molecules surrounding the puck. This force acts in the opposite direction of the puck's velocity, slowing it down. This force increases with the speed of the puck, but is always negligible compared to the other forces acting on the puck.
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Question 23
How would a base isolation system help to protect a building during an earthquake?
A. The base isolation system makes the building move in an opposite direction to
the shaking ground.
B. The base isolation system reduces the strength of an earthquake wave before it
reaches the building.
C. The base isolation system changes the direction of an earthquake wave before it
reaches the building.
D. The base isolation system prevents the building from coming into direct contact
with the shaking ground.
Answer:
D. The base isolation system prevents the building from coming into direct contact with the shaking ground.
Explanation:
During an earthquake, the ground moves rapidly and can cause significant damage to buildings and infrastructure. A base isolation system is a technique used to protect buildings and other structures from earthquake damage by reducing the amount of shaking they experience. The system involves isolating the building's foundation from the ground using flexible bearings, springs, or pads. This helps to decouple the building from the shaking ground and reduce the amount of energy that is transferred to the structure during an earthquake. By preventing direct contact between the building and the ground, the base isolation system can help to minimize damage to the building and improve its chances of survival during a seismic event.
Answer: D
Explanation: The base isolation system prevents the building from coming into direct contact with the shaking ground. RAHHHHHHHHH
Compare the ground-state electron configuration of oxygen and sulfur to that of selenium. What similarities or differences do you observe? How do you think this will affect the relative chemical or physical properties of these elements?
please help i need this as soon as possible thx
The ground-state electron configurations of oxygen, sulfur, and selenium are 2-8-8, 2-8-6, and 2-8-8-6 respectively. Oxygen and selenium both have 8 electrons in their outermost shell, while sulfur has 6.
This difference affects the chemical and physical properties of these elements, as elements with more electrons in their outermost shells tend to be more reactive due to increased electron availability for bonding.
As oxygen and selenium have the same number of electrons in their outermost shell, they have similar chemical and physical properties. Sulfur, with its fewer outer shell electrons, has different chemical and physical properties than oxygen and selenium.
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Which set of elements are most likely ductile and malleable?
a. Ag, Au, and C
b. Li, Zn, and Ag
c. K, S, and Ne
The set of elements that are most likely ductile and malleable is Li, Zn, and Ag (option B).
What is malleability and ductility?Malleability is the ability to be hammered into thin sheets; capable of being extended or shaped by beating with a hammer, or by the pressure of rollers.
Ductility is the ability of a material to be drawn out longitudinally to a reduced section without fracture under the action of a tensile force.
Ductility and malleability are the characteristics of metals.
In option B, lithium, zinc and silver are all metals.
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True or False: As an object's distance from the ground increases, so does its potential energy
Answer:
ture
Explanation:
The potential energy of any system veritably depends upon the distance depending upon the types of forces acting on the objects. The potential energy undeniably depends upon the distance and is inversely proportional to each other. If the force between the two is attractive then the potential energy will increase with increasing distance between them both, and if the force is repulsive then the potential energy will increase will decreasing the distance between them.
Which of these is NOT true of a molecule?
A:A. All molecules have equally strong bonds. B:B. A molecule is composed of at least two atoms. C:C. All molecules are too small to be seen without aid. D:D. A molecule forms after two atoms create a chemical bond
All molecules have equally strong bonds is not true of a molecule.
Strong covalent bonds hold atoms in molecules together, whereas weak intermolecular forces of attraction hold individual molecules together.
Ionic and covalent bonds are often regarded as strong bonding. But atoms or molecules can also unite to establish other, more transient relationships. London dispersion forces and hydrogen bonds are two examples of weak bonds that are frequently observed in biology.
Although the atoms in each molecule have strong bonds holding them together, the forces of attraction between molecules are often very weak. Usually gases, such covalent compounds include HCl, SO2, CO2, and CH4. There are weak attraction forces present in molecular structures.
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Use the reaction to answer the question.
N₂(g) + 3H₂(g) + 2NH3(g) + energy
When this reaction has reached equilibrium, how will it respond when the temperature of the system increases?
(1 point)
O The concentration of N₂ will decrease.
O The concentration of H₂ will decrease.
O The equilibrium will shift to the left.
O The equilibrium will shift to the right.
The equilibrium will respond to an increased temperature of the system by shifting to the left. Option 3.
Le Charterlier's principle
According to Le Chatelier's principle, when a system at equilibrium is subjected to a stress, the system will respond in a way that tends to counteract the stress and reestablish equilibrium. In this case, an increase in temperature is a stress that will disrupt the equilibrium.
According to the reaction equation, the forward reaction is exothermic, meaning that heat is released when the reaction proceeds in the forward direction. Therefore, an increase in temperature will cause the equilibrium to shift in the direction that absorbs heat, which is the reverse reaction.
To counteract the increase in temperature, the equilibrium will shift to the left, favoring the reactants. This means that the concentration of N₂ and H₂ will increase, while the concentration of NH₃ will decrease. Therefore, the correct answer is: The equilibrium will shift to the left.
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HELP PLEASE
How many grams are in 6.500 moles of calcium nitride, Ca3N2?
Answer:
963.95
Explanation:
to go from moles to anything you multiply. so when going from moles to grams to take your moles and them multiply by the molar mass of the compound. the molar mass in this case is 148.3.
look back at parts A and B to compare the properties of the unknown elements with the properties of the unknown elements. Based ok these properties, match each unknown element to its group in the periodic table. Drag each tile to the correct box .
The periodic table, also known as the periodic table of elements, is set up so that scientists can rapidly determine an element's mass, number of electrons, electron configuration, and other distinctive molecular characteristics.
What is periodic table?The chemical elements are arranged in rows and columns on what is known as the periodic table, or periodic chart of the (chemical) elements. It is frequently used in physics, chemistry, and other disciplines and is frequently regarded as a symbol of chemistry.
It is a visual representation of the periodic law, which asserts that the atomic numbers of chemical elements have a roughly periodic relationship with their characteristics. The table is split into four sections that are approximately rectangular in shape.
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A person with type A blood (AO) is crossed with a person with type B blood (BO). Which of the following shows the correct phenotype percentages.
If a person with type A blood (AO) is crossed with a person with type B blood (BO), the correct genotype percentage is 25% AB, 25% BO 25%AO, and 25% OO while the phenotypes are 25% A, 25% B, 25% AB and 25% O.
What is a punnet square in genetics?A punnet square in genetics is a useful diagram to estimate the phenotypes in offspring, in this case we have
A O
B AB BO
O AO OO
Therefore, with this data, we can see that the punnet square can be used to estimate phenotypes and thus determine the proportion of offspring.
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Please help me with this.
The number of moles of aluminum chloride that forms when 81g of aluminium reacts is 3 moles.
How to calculate stoichiometry?Stoichiometry is the study and calculation of quantitative (measurable) relationships of the reactants and products in chemical reactions (chemical equations).
According to this question, aluminium reacts with chlorine to produce aluminum chloride.
Based on the balanced equation, 2 moles of aluminum produces 2 moles of aluminium chloride.
81 g of aluminium is equivalent to 3 moles of aluminum
This means that 3 moles of aluminum chloride will be produced if 3 moles of aluminum reacts.
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Balance this equation: CS^2 + O^2 ---> CO^2 + SO^2
Balanced equation = CS₂ + O₂ = 2CO₂ + SO₂ . The reaction's mass and charge are in balance on both sides.
What is a reaction to balance?An equation for a chemical reaction that has the same total charge and number of atoms for both the reactants and the products is called a balanced equation. To put it another way, the reaction's mass and charge are in balance on both sides.
A balanced chemical equation is one in which the mass of the reactants and the mass of the products are both equal to the number of atoms of each element on both sides of the equation.
Why do we balance equations?To comply with the law of conservation of mass, which states that "Total mass of all the products of the reaction in a chemical reaction is equal to the total mass of all the reactants," the chemical equation must be balanced.
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