Question 1

0.450 moles of NaCl are dissolved in 95.0 mL of water. Calculate the molarity of the NaCl solution.

Accepted Answer

4.7M

Answer

2.1M

Answer

0.21M

Answer

0.0047M

Question 2

How many moles of Ca(NO3)2 are there in 75 mL of 0.25 M solution?.

Accepted Answer

0.0188 mol

Answer

3.33 mol

Answer

0.00333 mol

Answer

18.8 mol

Question 3

15 g of NaCl occupy a volume of 75 mL. What is the molarity of the solution?

Accepted Answer

3.4 M

Answer

0.019 M

Answer

0.0034 M

Answer

0.29 M

Question 4

Hydrogen gas reacts with nitrogen gas to produce ammonia, as shown below.

3 H$_2$ + N$_2$ —> 2 NH$_3$

Approximately how many grams of hydrogen gas are needed to completely react with 84 grams of nitrogen gas?

Accepted Answer

18g

Answer

84g

Answer

6g

Answer

9g

Question 5

Hydrogen gas reacts with oxygen gas to produce water, as shown below.

2 H$_2$ + O$_2$ —> 2 H$_2$O

Approximately how many grams of hydrogen gas are needed to completely react with 128 grams of oxygen gas?

Accepted Answer

16g

Answer

8g

Answer

4g

Answer

32g

Question 6

The equation below shows the reaction of silicon dioxide (SiO$_2$) with carbon (C) to produce silicon carbide (SiC).  Assume that 200 g of silicon dioxide reacts with excess carbon to produce 213.1 g of silicon carbide. 
 
SiO$_2$ + 3 C —> SiC + 2 CO                               
    What is the approximate percent yield for this reaction?

Accepted Answer

62.3%

Answer

40%

Answer

72.2%

Answer

80%

Question 7

According to kinetic molecular theory, which statement best describes a gas?

Accepted Answer

Its volume if mostly empty space

Answer

All particles have equal energy

Answer

Its composition is very orderly

Answer

Mass changes frequently

Question 8

Which of the following is Boyle's Law?

Accepted Answer

P$_i$V$_i$=P$_f$V$_f$

Answer

V$_i$/T$_i$=V$_f$/T$_f$

Answer

P$_i$/T$_i$=P$_f$/T$_f$

Question 9

Which of the following is Charles Law?

Accepted Answer

V$_i$/T$_i$=V$_f$/T$_f$

Answer

P$_i$/T$_i$=P$_f$/T$_f$

Answer

P$_i$V$_i$=P$_f$V$_f$

Question 10

Which of the following is Gay-Lussac's Law?

Accepted Answer

P$_i$/T$_i$=P$_f$/T$_f$

Answer

V$_i$/T$_i$=V$_f$/T$_f$

Answer

P$_i$V$_i$=P$_f$V$_f$

Question 11

A 2-L sample of an ideal gas at 278 K has a pressure of 0.5 atm.

Assuming that volume is constant, what is the approximate pressure of the gas after it is heated to 378 K?

Accepted Answer

0.7atm

Answer

25atm

Answer

50atm

Answer

2.7atm

Question 12

A sample of an ideal gas occupies a volume of 15 L at 20 mm Hg.   
  
Assuming that temperature is constant, what volume does the gas occupy at 100 mm Hg?

Accepted Answer

3L

Answer

15L

Answer

5L

Answer

85L

Question 13

Before a bicycle was ridden, its front tire had a pressure of 45 psi. After a long ride, the same tire measured 48 psi. What Gas Law explains this phenomenon?

Accepted Answer

Gay-Lussac's

Answer

Roberts

Answer

Charles

Answer

Boyle's

Question 14

What group on the periodic table contains the noble gases?

Accepted Answer

8a/18

Answer

7a/17

Answer

1

Answer

2

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