Question 1

Which of the following best describes what is happening in the image of the beaker with a blue precipitate forming at the bottom?

Accepted Answer

A precipitation reaction is occurring, forming an insoluble solid from two aqueous solutions.

Question 2

According to Table 3.2, what is the oxidation state of sulfur in $$SO_4$$^{2-}$$?

Accepted Answer

$$+6$$

Question 3

Which of the following reactions is an example of an oxidation-reduction (redox) reaction?

Accepted Answer

$$MnO_4^-(aq) + 4H^+(aq) + 2Cl^-(aq$$) \rightarrow $$Mn^{2+}(aq) + 2H_2O(l$$) + $$Cl_2(g$$)$$

Question 4

In the reaction $$Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)$$, which species is oxidized?

Accepted Answer

$$Zn$$

Question 5

Which step is performed first when balancing a redox equation in acidic solution?

Accepted Answer

Balance all atoms except for H and O.

Question 6

A sample of gas occupies 4.0 L at 2.0 atm. If the pressure is increased to 4.0 atm at constant temperature, what is the new volume?

Accepted Answer

2.0 L

Question 7

Which law explains why a hot air balloon rises when the air inside is heated?

Accepted Answer

Charles's Law

Question 8

What is the total pressure in a container that holds $$0.50$$ mol $$H_2 (2.4 $$atm) and $$1.25$$ mol $$He (6.0 $$atm) at $$20^	ext{o}C$$?

Accepted Answer

8.4 atm

Question 9

A reaction occurs in basic solution. After balancing all atoms except H and O, what is the next step?

Accepted Answer

Add $$H_2O to $$the side lacking oxygen.

Question 10

Which of the following statements about the kinetic-molecular theory of gases is FALSE?

Accepted Answer

Gas particles exert attractive forces on each other.

Question 11

A 1.00 L flask contains $$1.00 	imes 10$$^{20}$$ molecules of N_2$ at 175^	$$ext{o}C$$. What is the pressure in kPa? (R = 8.314$ kPa L mol$$^{-1}$$ K$$^{-1}$$)

Accepted Answer

$$0.68$$ kPa$$\cdotL$

Question 12

Which of the following is the correct balanced equation for the redox reaction in basic solution: $$MnO_4^-(aq) + CN^-(aq$$) \rightarrow $$MnO_2(s) + $$OCN^-(aq)$$?

Accepted Answer

$$MnO_4^-(aq) + CN^-(aq) + 2H_2O(l$$) \rightarrow $$MnO_2(s) + $$OCN^-(aq) + 2OH^-(aq)$$

Question 13

A gas sample has a pressure of 98.4 kPa, a volume of 5.00 L, and a temperature of $$25^	ext{o}C. $$How many moles of gas are present? ($$R = 8.314$$ kPa L mol$$^{-1} K$^{-1})$$

Accepted Answer

$$0.198$$ mol

Question 14

Which of the following is NOT a property of gases explained by the kinetic-molecular theory?

Accepted Answer

Definite shape and volume

Question 15

If 2.0 mol of $$H_2$$ gas and 1.0 mol of $$O_2$$ gas react to form water vapor at STP, what volume of water vapor is produced?

Accepted Answer

$$44.8 L$$

Question 16

Which of the following is the correct relationship for Avogadro's Law?

Accepted Answer

$$V_1$$/$$n_1$$ = $$V_2$$/$$n_2$$

Question 17

A reaction produces $$0.50$$ mol $$CO_2$$ gas at $$25^	ext{o}C$$ and $$1.00$$ atm. What volume does the $$CO_2$$ occupy?

Accepted Answer

$$11.2 L$$

Question 18

Which of the following is the correct value for the universal gas constant $$R in SI $$units?

Accepted Answer

$$8.314 J $$mol$$^{-1} K$^{-1}$$

Aqueous Reactions and Gas Laws: Core Concepts and Applications

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