According to the question the volume of dry butane at 824.1 torr and 55.9 °C is 0.945 L.
What is volume?Volume is the measure of the three-dimensional space that an object or substance occupies. It is usually measured in cubic units such as milliliters (ml), liters (L), or cubic centimeters (cm3). Volume is an important physical property of substances because it helps to determine the amount of a material present in a given space.
We can use the Ideal Gas Law to calculate the volume of the dry butane gas.
The Ideal Gas Law states that PV = nRT, where P is pressure, V is volume, n is the number of moles of the gas, R is the ideal gas constant, and T is temperature.
First, we need to calculate the number of moles of butane gas, n, using the molar mass of butane, which is 58.12 g/mol.
n = (mass of gas)/(molar mass of gas)
n = (1.00 L * 754.4 torr * 0.08206 L*atm/mol*K * (283.15 K))/(58.12 g/mol * 101.325 kPa/atm)
n = 0.077 moles
Now that we know the number of moles of butane gas, we can calculate the volume of the dry butane gas at the new pressure and temperature.
V = (nRT)/P
V = (0.077 moles * 0.08206 L*atm/mol*K * (328.04 K))/(824.1 torr)
V = 0.945 L
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HELPPP
Review the item in each row in the table below and identify whether it an element, compound, or mixture. If it is a mixture, then also specify whether heterogeneous or homogeneous. explain how?
Answer:
Oil and water: mixture/heterogeneous
Explanation:
1. Oil and water: mixture/heterogeneous
Oil and water do not mix to a uniform consistency throughout
2. Copper wire: element
3. Chalk: compound
4. Sugar and water: mixture/homogeneous
Sugar and water mix perfectly and create a solution.
5. Water: compound
6. Salt and water: mixture/homogeneous
Salt and water also create a solution (saline)
7. Aluminum foil: element
8. Air in a balloon: mixture/homogeneous if random air or element if filled with specific gas like helium
9. Nitrogen: element
10. Pizza: mixture/heterogeneous
Each substance on the pizza can be readily identified and seperated
A student mixed 24.5 g of magnesium bromide with 8.67 x 1022 molecules of hydroiodic acid... They recovered 8.23 g of acid. What is the percent yield?
Explanation:
Refer to pic............
reflection
about balancing chemical equation
and molecular wiegth and mollar mass
and molecular ratio and moles of molecules / atoms/
pwede nyo bang gawin Lahat Yan ng reflection
We know a balanced equation by counting the atoms of both sides of the reaction equation.
How do you balance chemical equation?It seems you are asking something about the balancing of chemical reaction equations and I will explain just that.
Balancing a chemical equation involves making sure that the number of atoms of each element on the reactant side of the equation is equal to the number of atoms of that element on the product side of the equation. Here are the steps to balance a chemical equation:
Write the chemical equation using the correct chemical formulas for the reactants and products.
Count the number of atoms of each element on the reactant side and the product side of the equation.
Identify the element that is not balanced.
Use coefficients (numbers in front of the chemical formulas) to balance the equation. Start with the element that appears in the fewest number of compounds and work your way up.
Double-check that the equation is balanced by counting the number of atoms of each element on both sides of the equation.
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Jana is a scientist and is designing a portable water warmer that can help her warm up her samples while away from the lab. The device will store two chemicals separately. When she wants to warm up water, she will activate the device, which will mix the chemicals together to generate energy in the form of heat. The heat will increase the temperature of a third part of the device, which is filled with water. Jana wants to find the best amount of two chemicals that will generate energy in a safe and portable way. She mixes copper sulphate and zinc in a beaker and records her observations in the table.
Jana needs her device to be able to warm water to temperatures between 70 °C and 100 °C. She tests the device using different amounts of copper sulfate and zinc and records the resulting water temperature at different time intervals.
The table shows the amount of zinc and copper sulfate that were used for each trial. The graph shows the data she collected on the temperature of the water.
⦁ Determine the type of reaction that took place in the beaker. Justify your answer using evidence from the graph.
⦁ Interpret the factors that affected the water temperature. List at least 2 factors.
⦁ How could Jana modify her design to meet the temperature constraints? Provide at least 3 ideas.
⦁ Is this copper sulfate and zinc reaction balanced? Justify your answer.
CuSO4 (aq) + H2O (aq) + Zn(s) Cu(s) + ZnSO4(aq) + H2O(aq)
⦁ What other combination of reactive chemicals can Jana use in case copper sulfate and zinc didn’t give her the results she was waiting for?
⦁ Create a model to demonstrate a chemical reaction, including a detailed explanation of the reaction and any changes that occur.
⦁ Research 2 other examples from real life where endothermic and exothermic reactions can be used safely in creating items of benefit to humanity. Describe the role of the reaction in the product usage.
Answer: I would love to help but i cant see the table
Explanation:
Jana can modify her device by increasing the amount of zinc and decreasing the amount of copper sulfate to generate more heat, which will increase the water temperature within the desired range of 70°C to 100°C.
How could Jana modify her design to meet the temperature constraints?
Factors that affected the water temperature include the amount of zinc and copper sulfate used, the duration of activation, and the initial temperature of water. To meet the temperature constraints, Jana could modify her device by:Increasing the amount of zinc and decreasing the amount of copper sulfate to generate more heatDecreasing the amount of water to be heatedUsing a more efficient heat transfer mechanismBy making these modifications, Jana can increase the water temperature to the desired range and ensure that her device is portable, safe, and effective.
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Introduction:
Define the following terms:
Chemical reaction, reactant, product, precipitate, Law of Conservation of Mass
Each element's mass at the start of an interaction will be the same as its mass at the conclusion of the reaction.
Does water operate as a reactant?Individual water molecules may behave as catalysts or reactants in the process. By interactions between solute and solvent and solvent rearrangement, water can influence variations in the free activation power.
Which side is composed of products and reactants?In a chemical reaction, the active sites (what you start with) are transformed into byproducts (what you end with). An arrow separates the reaction mixture, which are displayed on the left side about an equation, from the product, which are displayed on the right.
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Can you help me put this in order please i know henning Bramd go first but i need this quick
The list appears to be a chronological order of famous scientists and chemists. Here's the order from earliest to latest:
Hennig BrandRobert BoyleMarie CurieJohn NewlandsLothar MeyerDimitri MendeleevJ.J ThomsonErnest RutherfordSir William RamsayGlenn SeaborgWho are scientists?Generally, Robert Boyle (1627-1691): Irish chemist and physicist, known as the founder of modern chemistry.
Hennig Brand (c. 1630 – c. 1710): German alchemist and the discoverer of phosphorus.
Marie Curie (1867-1934): Polish-born physicist and chemist, famous for her pioneering research on radioactivity and the first woman to win a Nobel Prize.
John Newlands (1837-1898): English chemist who developed the concept of the periodic table of elements.
J.J Thomson (1856-1940): English physicist who discovered the electron and isotopes.
Lothar Meyer (1830-1895): German chemist who independently developed the concept of the periodic table around the same time as Dmitri Mendeleev.
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How are global winds produced?
a) When low pressure equatorial air moves to replace sinking high pressure polar air.
b) When high pressure equatorial air moves to replace sinking low pressure polar air.
c) When high pressure polar air moves to replace rising low pressure equatorial air.
d) When low pressure polar air moves to replace rising high pressure equatorial air.
Global winds are produced when high pressure polar air moves to replace rising low pressure equatorial air.
What do you mean by global wind?
Large-scale atmospheric circulation patterns that cover the entire planet are referred to as global winds. The uneven heating of the Earth's surface by the sun, which results in temperature differences and pressure gradients, is what causes these winds. Ocean currents are influenced by global winds, which also move heat and moisture throughout the planet and affect weather and climate patterns.
The trade winds, the dominant westerlies, and the polar easterlies are the three main wind belts that make up the global wind system. In the tropics, the predominant westerlies move from west to east, but in the mid-latitudes, the trade winds move from east to west. Near the poles, polar easterlies wind from east to west.
The correct option is:
c) When high pressure polar air moves to replace rising low pressure equatorial air.
The uneven heating of the Earth's surface by the sun, which results in temperature disparities and pressure gradients, is what causes global winds. Low pressure occurs close to the equator and high pressure occurs close to the poles as a result of warm air rising at the equator and cold air sinking at the poles.
Global winds are caused by air flowing from high-pressure to low-pressure regions. In this instance, the global wind system is created when high pressure polar air travels towards the equator to replace rising low pressure equatorial air.
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What is the formula (length)x(width)x(height) used for? a The formula for finding the density b The formula for finding the volume c The formula for finding the mass
To determine the density of a solid that has regular side lengths, it is first needed to calculate the volume of the solid using the equation volume = length x width x height option b)
What is density with example?density is the bulk of a solid component per unit volume. d = M/V, where d is density, M is mass, and V is volume, is the expression for density. Grams per cubic centimetre are a standard unit of measurement for density.
For example, the density of water is 1 gramme per cubic centimetre, and Earth's density is 5.51 grammes per cubic centimetre. Another way to state density is in kilos per cubic metre (in metre-kilogram-second or SI units).
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HELP!!! CHEMISTRY QUESTION NEED ANSWERED QUICKLY!!!
(Picture attached)
The forward reaction for Reaction B is...
- endothermic
- exothermic
If Reaction B was at equilibrium and then was heated ______ CH3OH would be present after the reaction adjusts to the new temperature.
- more
- less
- the same amount of
If Reaction B was at equilibrium and then H2 was added, _____ CH3OH would be present after the reaction adjusts.
- more
- less
- the same amount of
If Reaction B was at equilibrium and then H2 was added, _____ CO would be present after the reaction adjusts.
- more
- less
- the same amount of
Answer:
#1 exothermic
Science (middle school work)
The answers include the following:
The fossil record arranges fossils in order from oldest to youngest gives us a picture of how the organism evolve over time.A Romer's gap is when fossil stop in the fossil record.Fossils are the remains of organisms preserved in the earth that provides of life's history of earth.Index minerals are primarily found in metamorphic rocks because these rocks form at low temperature and pressure.What is a Fossil?This is referred to as any preserved remains, impression, or trace of any once-living thing from a past geological age.
They are the remains of organisms preserved in the earth that provides of life's history of earth and also provides more information about the evolutionary sequence and activities which took place on earth as a whole.
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17. How many joules of heat are absorbed to raise the
temperature of 435 grams of water at 1 atm from
25°C to its boiling point, 100.°C?
A) 4.5 X 10^4 J
C) 2.5 X 10^7 J
B) 1.4 X 10^5 J
D) 7.4 X 10^7 J
The amount of heat absorbed to raise the temperature of 435 grams of water at 1 atm from 25°C to its boiling point, 100°C, is approximately 1.4 × 10^5 joules
What is specific heat?
Specific heat is the amount of heat energy required to raise the temperature of a substance by one unit of temperature per unit of mass. It is a physical property that helps to characterize a substance and is typically measured in units of joules per gram per degree Celsius (J/g°C) or calories per gram per degree Celsius (cal/g°C).
The amount of heat absorbed to raise the temperature of a substance can be calculated using the formula:
Q = mcΔT
where Q is the amount of heat absorbed (in joules), m is the mass of the substance (in kilograms), c is the specific heat capacity of the substance (in joules per kilogram per degree Celsius), and ΔT is the change in temperature (in degrees Celsius).
Substituting the given values, we get:
m = 435 grams = 0.435 kg
ΔT = 100°C - 25°C = 75°C
The specific heat capacity of water is 4.184 J/g°C. We can convert this to joules per kilogram per degree Celsius (J/kg°C) by dividing by 1000:
c = 4.184 J/g°C ÷ 1000 = 4.184 J/kg°C
Substituting these values, we get:
Q = (0.435 kg) × (4.184 J/kg°C) × (75°C)
Q = 140,089.2 J
Therefore, the amount of heat absorbed to raise the temperature of 435 grams of water at 1 atm from 25°C to its boiling point, 100°C, is approximately 1.4 × 10^5 joules. The answer closest to this value is option (B).
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4Al + 3O2 -> 2Al203
How many Liters of oxygen gas at STP are required to react with 2.00 moles of aluminum?
Explanation:
Refer to picture above.........
reflection
about balancing chemical equation
and molecular wiegth and mollar mass
and molecular ratio and moles of molecules / atoms/
pwede nyo bang gawin Lahat Yan ng reflection
Answer:
The chemical equation for this reaction above would be written as: 2 H 2 ( g) + O 2 ( g ) → 2 H 2 O ( g )
Explanation:
These symbols represent sodium hydroxide and hydrogen gas. Sodium hydroxide is
a strong base. (Chemicals that contain the hydroxide ion (OH) are bases.)
How do the products of the reaction relate to the phenol red test and the splint test?
The appearance of pink color in the phenol red test and the presence of flame and "pop" sound in the splint test indicate the production of NaOH and H2 gas, respectively, in the reaction between zinc, HCl, and NaOH.
How does sodium hydroxide and hydrogen gas appear from the phenol red test and the splint test?Sodium hydroxide (NaOH) and hydrogen gas (H2) can be produced by the reaction between zinc and hydrochloric acid (HCl) in the presence of sodium hydroxide. This reaction can be tested using the phenol red test and the splint test.
In the phenol red test, phenol red indicator is added to the reaction mixture. Phenol red is a pH indicator that changes color depending on the acidity or basicity of the solution. When NaOH is added to the reaction mixture, it neutralizes the acid (HCl) and increases the pH of the solution. This causes phenol red to change from yellow (acidic) to pink (basic). The appearance of pink color indicates the presence of NaOH.
In the splint test, a lighted splint is brought near the reaction mixture. When H2 gas is produced in the reaction, it can be tested using the splint test. H2 is a highly flammable gas that reacts with oxygen (O2) to produce water (H2O) vapor. When a lighted splint is brought near the reaction mixture, it can ignite the H2 gas, producing a "pop" sound and a small flame. This appearance of flame and "pop" sound confirms the presence of H2 gas.
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Use the equation for Boyle’s Law to calculate the following. (2pts)
A piston chamber, like a car engine, is filled with 2.00 L of nitrogen gas at 425kPa. The piston is compressed to a volume of 0.35 L.
What is now the pressure inside of the piston chamber? (Assume no gas leaked out).
According to the question the pressure inside the piston chamber is 2414.29 kPa.
What is pressure?Pressure is a measure of the force applied to a given area. It is usually expressed in terms of force per unit area such as pascals (Pa). Pressure is an important concept in physics and is used to describe a variety of phenomena in many areas of science. Pressure is most commonly used to describe the force applied by a gas or liquid on an object. The greater the pressure, the stronger the force. It can also be used to describe forces that are applied to a surface by a solid object. Pressure can be measured with a variety of instruments such as manometers, barometers, and pressure gauges.
The equation for Boyle's Law is P1V1=P2V2, where P1 is the original pressure, V1 is the original volume, P2 is the new pressure, and V2 is the new volume. Using this equation, we can calculate the new pressure, P2, as follows:
P2 = (P1V1)/V2
P2 = (425kPa * 2.00L) / 0.35L
P2 = 2414.29kPa
Therefore, the pressure inside the piston chamber is 2414.29kPa.
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give an example of false solution
An example of false solution is a natural gas.
What is Natural Gas?Natural gas is primarily methane with smaller quantities of other hydrocarbons.
It was formed millions of years ago when dead marine organisms sunk to the bottom of the ocean and were buried under deposits of sedimentary rock.
False solutions are those that do not actually address the problem at hand substantially but deceive people into believing that they do, while at the same time triggering other serious problems.
Examples of false solutions include:
clean development mechanisms; carbon markets; carbon capture and storage; burning trees and biomass as BioenergyTherefore, an example of false solution is a natural gas.
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what's the difference between ionic and covalent bonding
Answer:
There are primarily two forms of bonding that an atom can participate in: Covalent and Ionic. Covalent bonding involves the sharing of electrons between two or more atoms. Ionic bonds form when two or more ions come together and are held together by charge differences.
Explanation:
The force of gravity is dependent on certain factors. According to the illustration, what factor(s) influence the gravitational attraction between two objects. A) mass and distance B) distance and pull C) composition and mass D) mass and density
According to the illustration, the factors that influence the gravitational attraction between two objects would be mass and distance. Option A.
Factors influencing gravitational attractionThe gravitational attraction between two objects is determined by two factors: their masses and the distance between them.
The greater the mass of each object, the greater the gravitational attraction between them. The farther apart the objects are, the weaker the gravitational force between them.This is due to the inverse square law, which states that the force between two objects is proportional to the inverse square of the distance between them.
Therefore, the correct answer is mass and distance.
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Answer:it is A
Explanation:
Can you help me put this in order please i know henning Bramd go first but i need this quick
•Hennig Brand
• Sir William Ramsay
• Ernest Rutherford
• Dimitri Mendeleev
• J.J Thomson
• John Newlands
• Lothar Meyer
• Glenn Seaborg
• Robert Boyle
• Marie Curie
Scientists in their order of discoveries are Robert Boyle,Hennig Brand, Lothar Meyer,Sir William Ramsay,Marie Curie,John Newlands,Glenn Seaborg,Ernest Rutherford, Dimitri Mendeleev,J.J Thomson.
Who are scientists?A scientist is a person who researches to advance knowledge in an area of the natural sciences.
In classical antiquity, there was no real ancient analog of a modern scientist. Instead, philosophers engaged in the philosophical study of nature called natural philosophy, a precursor of natural science.Though Thales (circa 624–545 BC) was arguably the first scientist for describing how cosmic events may be seen as natural, not necessarily caused by gods.
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Which is the correct assumption used to calculate the steady-state concentration of a pollutant in the lake, so that the concentration in the lake is equal to the one in the exit stream: group of answer choices the pollutant is conservative the lake is completely mixed steady- state conditions prevail first-order reaction kinetic no pollutant accumulation in the lake
The correct assumption used to calculate the steady-state concentration of a pollutant in the lake, so that the concentration in the lake is equal to the one in the exit stream is that the pollutant is conservative, meaning that it does not react or transform chemically in the lake or in the exit stream. This assumption allows for the use of mass balance equations to calculate the steady-state concentration of the pollutant based on the inflow and outflow rates, assuming that there is no accumulation of the pollutant in the lake. The other assumptions listed (completely mixed lake, steady-state conditions, first-order reaction kinetics) may also be relevant in certain cases, but the conservative pollutant assumption is the most fundamental and necessary one for the calculation of steady-state pollutant concentrations.
If X is an atom from group 3 and Y is an atom from group 6, what is the most likely ionic formula?
If X is an atom from the group 3 and Y is an atom from the group 6, the most likely ionic formula is X₂Y₃.
The X is the atom from the group 3 and it will form the cation = X³⁺
The Y is the atom from the group 6 and it will form the anion = Y²⁻
To balance the charges, the 2X³⁺ cations and the 3Y²⁻ anions form the ionic formula. The ionic formula of the compound is as follows :
The ionic formula = X₂Y₃
This is called as the ionic compound, in which the compound is formed by the sharing of the electrons.
Thus, the ionic formula is X₂Y₃.
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Methane gas combusts according to the following chemical
equation:
CHA(g) + 202(g) -› CO2(g) + 2H,0(1)
29.2 L of methane gas is combusted with 63.3 L of oxygen
gas at STP. What volume of carbon dioxide is produced in the
reaction?
L CO2
Your answer should be rounded to three significant figures. Do not Include
units In your answer.
Answer:
From the balanced chemical equation, we know that 1 mole of methane reacts with 2 moles of oxygen gas to produce 1 mole of carbon dioxide and 2 moles of water vapor. At STP (standard temperature and pressure, 0°C and 1 atm), 1 mole of gas occupies 22.4 L of volume.
First, we need to determine how many moles of methane and oxygen are involved in the reaction. Since the volumes of gases are given at STP, we can use the ideal gas law:
n = PV/RT
where n is the number of moles of gas, P is the pressure, V is the volume, R is the gas constant, and T is the temperature. At STP, the pressure is 1 atm and the temperature is 0°C or 273 K. Therefore, we have:
n(CH4) = (29.2 L)(1 atm)/(0.0821 L·atm/mol·K)(273 K) ≈ 1.15 mol
n(O2) = (63.3 L)(1 atm)/(0.0821 L·atm/mol·K)(273 K) ≈ 2.49 mol
From the balanced chemical equation, we know that 1 mole of methane produces 1 mole of carbon dioxide. Therefore, we can determine the volume of carbon dioxide produced using the ideal gas law:
V(CO2) = n(CO2)RT/P
where V is the volume, n is the number of moles, R is the gas constant, T is the temperature, and P is the pressure. At STP, the pressure is 1 atm and the temperature is 0°C or 273 K. Therefore, we have:
V(CO2) = (1.15 mol)(0.0821 L·atm/mol·K)(273 K)/(1 atm) ≈ 26.7 L
Therefore, approximately 26.7 L of carbon dioxide gas is produced in the reaction.
If 20. 0 g of magnesium react with excess hydrochloric acid, how many grams of magnesium chloride are produced? ____Mg + ____HCl ___MgCl2 + _____H2
78.3 grams of magnesium chloride are produced when 20.0 g of magnesium reacts with excess hydrochloric acid.
The balanced chemical equation for the reaction between magnesium and hydrochloric acid is:
Mg + 2HCl → MgCl2 + H2
From the equation, we can see that one mole of magnesium reacts with two moles of hydrochloric acid to produce one mole of magnesium chloride and one mole of hydrogen gas.
To find the amount of magnesium chloride produced when 20.0 g of magnesium reacts, we first need to convert the mass of magnesium to moles. The molar mass of magnesium is 24.31 g/mol, so:
moles of Mg = 20.0 g / 24.31 g/mol = 0.823 moles of Mg
According to the stoichiometry of the balanced equation, 1 mole of magnesium produces 1 mole of magnesium chloride, so the moles of magnesium chloride produced will also be 0.823 moles.
Finally, we can convert the moles of magnesium chloride to grams using the molar mass of magnesium chloride, which is 95.21 g/mol:
mass of MgCl2 = 0.823 moles × 95.21 g/mol = 78.3 g
When 20.0 g of magnesium reacts with excess hydrochloric acid, 78.3 g of magnesium chloride is formed. The reaction's balanced chemical equation is:
Mg + 2HCl → MgCl2 + H2
So, 20.0 g of Mg reacts with 1.65 moles of HCl to produce 78.3 g of MgCl2 and H2 gas.
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HELP ME OUT PLEASEE
4. How many molecules are in 163.395g calcium hydroxide, Ca(OH)2?
5. How many moles of bromine are in 3.68 mol sulphur tetrabromide, SBr4?
According to concept of Avogadro's number and mole concept, there are 13.28×10²³ molecules and 14.72 moles respectively.
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 molecules=163.395/74.09×6.023×10²³=13.281×10²³ molecules and number of moles= 3.68×4=14.72 moles.
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Consider all of the different types of c-h bonds in cyclopentene and rank them in order of increasing bond strength? 10. 25 (
In cyclopentene, there are three types of C-H bonds:
Allylic C-H bond (bond adjacent to the double bond)
Bridgehead C-H bond (bond at the bridgehead carbon)
Methylenic C-H bond (bond in the ring)
The order of increasing bond strength is generally:
Allylic C-H bond
Methylenic C-H bond
Bridgehead C-H bond
Cyclopentene is a cyclic hydrocarbon with the molecular formula C5H8. It is an unsaturated compound with a double bond between two carbon atoms in the ring, making it an alkene. Cyclopentene is a clear, colorless liquid that is insoluble in water but soluble in many organic solvents. It is commonly used as a starting material in the synthesis of various organic compounds, including pharmaceuticals and agrochemicals.Cyclopentene undergoes various chemical reactions due to its unsaturated nature, such as addition reactions with electrophiles and hydrogenation reactions. It can also undergo polymerization to form poly(cyclopentene) with a high glass transition temperature and good mechanical properties.
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e.
Which two statements are true about this chemical reaction that forms acid
rain?
2NO₂ + H₂O
0-N=0 H-O-H
0-N=0
→HNO₂ +
HNO HON=0
HNO,
O
A. The bonds that form are between N and O in NO₂ and between H
and O in H₂O.
B. The bonds that break are between N and O in HNO2 and between
O and H in HNO3.
C. The bonds that form are between N and O in HNO2 and between
O and H in HNO3.
D. The bonds that break are between N and O in NO₂ and between H
and O in H₂O.
The two statement which are true about acid rain with chemical changes are the bonds that form are between N and O in HNO₂ and between O and H in HNO₃.The bonds that break are between N and O in NO₂ and between H and O in H₂O.
What are chemical changes?Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
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If you calculated 1.22 × 0.91, how many significant figures would be in the answer?
2
3
4
5
Answer: 2.
Explanation: Because, if you multiply 1.22 by 0.91 or .91, you’ll get 1.1102.
*If this answer doesn’t help, let me know so I can configure this.
Which of the following is NOT a safety precaution for handling radioactive material?
A. Store radioactive material in a shielded container.
B. Remove all metal before entering the containment room.
C. Use tongs or robotic arms to handle materials.
D. Monitor exposure with a film dose bandage.
The option which is not a safety precaution for handling Radioactive material is option B. Remove all metal before entering the containment room.
Radioactive substances are those which have an unstable nucleus. They achieve stability by emitting radiations like alpha particles, beta particles and gamma rays.
Working or experimenting on such substances can pose serious health risks like cancer, cardiovascular diseases etc.
Therefore following strict safety precautions while handling radioactive material is mandatory.
Certain safety measure could include
1) Protect the skin from radiation exposure by using film bandages.
2) When the radioactive sample is not in use, store them in a shielded container right away.
3) Always use gloves, tongs or remote operated robotic arms to handle the samples.
4) Do not eat, drink, smoke, or apply cosmetics in the laboratory.
5) Wear disposable clothes to reduce the risk of contamination from the samples.
Therefore, The option which is not a safety precaution for handling Radioactive material is option B. Remove all metal before entering the containment room.
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Given the reaction,
2 H2 (g) + 02 (g) -> 2 H20 (g)
Find the mass of water produced from 6.4 L H2 at STP if all of it reacts. Round your answer to two decimal places.
Answer:
First, we need to find the number of moles of H2 present in 6.4 L at STP (Standard Temperature and Pressure), which is 0°C and 1 atm pressure. At STP, one mole of any gas occupies 22.4 L of volume.
So, the number of moles of H2 present in 6.4 L at STP is:
6.4 L H2 x (1 mol H2/22.4 L H2) = 0.286 mol H2
From the balanced chemical equation, we know that 2 moles of H2 produce 2 moles of H2O.
So, 0.286 mol H2 will produce (2/2) x 0.286 = 0.286 mol H2O.
Finally, we can use the molar mass of water (18.015 g/mol) to find the mass of water produced:
0.286 mol H2O x 18.015 g/mol = 5.16 g H2O
Therefore, the mass of water produced from 6.4 L H2 at STP is 5.16 g.
the kelvin temperature of gas decreases to one- third its original value the pressure exerted on the gas remains constant what happens to the volume of the gas?
the amount of gas present does not change when the pressure is applied to it It gets bigger.
When a gas's temperature declines but its pressure and amount stay constant, what happens to its volume?These are typical examples of how temperatures can alter the volume of a confined gas while keeping the pressure constant:The volume increases as the temperature rises and decreases as the temperature drops.
How does a gas's pressure change as its temperature decreases?A gas's molecules move more swiftly when it is heated because they are given more energy.More pressure and greater collisions are the direct result for the container's walls.Yet, cooling the particles will make them move more slowly and lower pressure.Try this to play about with the relationships a little.
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