AnswersTX-Chemistry B-CRUnit Test

Unit Test — Unit test Answers

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The volume of a gas decreases to half of its original volume, but the gas maintains the same number of moles and temperature. According to the ideal gas law, what will most likely happen to the pressure?

A
It will double.
B
It will decrease.
C
It will increase slightly.
D
It will remain the same.
2
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The gases listed are at standard temperature and pressure:· 1 mol of CO2 gas· 1 mol of N2 gas· 2 mol of O2 gasWhich statement is correct?

A
The volume of 1 mol of CO2 is greater than that of 2 mol of O2 .
B
The volume of 1 mol of CO2 is greater than that of 1 mol of N2 .
C
The volumes of 2 mol of O2 and 1 mol of N2 gases are the same.
D
The volumes of 1 mol of CO2 and 1 mol of N2 gases are the same.
3

A scientist is examining a mixture of nitrogen, hydrogen, and ammonia. The individual pressures that are exerted by nitrogen and hydrogen are 0.26 atm and 0.28 atm, respectively. If the total pressure is 0.90 atm, what is the partial pressure of ammonia?Use .

Question illustration
A
0.27 atm
B
0.36 atm
C
0.54 atm
D
0.90 atm
4

The ideal gas constant, R has several different values that could be used. Which quantity causes these differences?

A
pressure
B
temperature
C
volume
D
moles
5

Which law is described by saying that when the pressure of a gas in a sealed container is cut in half, the gas will double in volume at a steady temperature?

A
Boyle’s law
B
Charles’s law
C
Dalton’s law
D
Gay-Lussac’s law
6

A tire at 21°C has a pressure of 0.82 atm. Its temperature decreases to –3.5°C. If there is no volume change in the tire, what is the pressure after the temperature change?Use .

Question illustration
A
0.75 atm
B
0.89 atm
C
1.1 atm
D
1.3 atm
7

Consider the reaction.Which statement is true at STP? (The atomic mass of Mg is 24.31 u.)

Question illustration
A
3.0 g of Mg produce 3.0 L of H2 gas.
B
3.0 g of Mg produce 22.4 L of H2 gas.
C
24.31 g of Mg produce (3 22.4) L of H2 gas.
Option C
D
(3 24.31) g of Mg produce (3 22.4) L of H2 gas.
Option D
8

Which quantity is held constant when working with Boyle’s, Charles’s, and Gay-Lussac’s laws?

A
volume
B
moles
C
pressure
D
temperature
9

Consider the reaction.How many grams of carbon should be burned in an excess of oxygen at STP to obtain 2.21 L of carbon dioxide?

Question illustration
A
1.18 g
B
2.21 g
C
4.12 g
D
4.34 g
10

Which proportionality shows the result of combining Avogadro’s law with Boyle’s law?

A
Option
Option A
B
Option
Option B
C
Option
Option C
D
Option
Option D
11

Shana solves stoichiometry problems using the equation for the synthesis of water.Which interpretation of the balanced equation would cause Shana to make a mistake?

Question illustration
A
Two moles of hydrogen react with one mole of oxygen to form two moles of water.
B
Two grams of hydrogen react with one gram of oxygen to form two grams of water.
C
Two molecules of hydrogen react with one molecule of oxygen to form two molecules of water.
D
Two liters of hydrogen react with one liter of oxygen to form two liters of water.
12

What is the volume of 0.200 mol of an ideal gas at 200. kPa and 400. K?Use and .

Question illustration
A
0.83 L
B
3.33 L
C
5.60 L
D
20.8 L

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