Q: Which of the following reactions is a decomposition reaction?

$$\text{CuCO}_3(s) \xrightarrow{\Delta} \text{CuO}(s) + \text{CO}_2(g)$$

Q: Which of the following is the correct balanced equation for the reaction between hydrochloric acid and sodium hydroxide?

$$\text{HCl}(aq) + \text{NaOH}(aq) \rightarrow \text{NaCl}(aq) + \text{H}_2\text{O}(l)$$

Question 1

Which of the following best describes the reaction between aqueous lead (II) nitrate and copper (I) chloride to form lead (II) chloride and copper (I) nitrate?

Accepted Answer

It is a double replacement reaction.

Question 2

Given the reaction: $$2	ext{AlCl}_3(aq) + 3	ext{Na}_2	ext{CO}_3(aq) ightarrow 	ext{Al}_2(	ext{CO}_3)_3(s) + 6	ext{NaCl}(aq)$$, how many moles of NaCl are produced from 0.436 moles of AlCl$$_3$$?

Accepted Answer

$$1.31$$ moles

Question 3

Which of the following is a Brønsted-Lowry acid?

Accepted Answer

All of the above

Question 4

What is the conjugate acid of ammonia ($$	ext{NH}_3$$)?

Accepted Answer

$$	ext{NH}_4^+$$

Question 5

A titration is performed using 25.8 mL of 2.5 M KOH to neutralize 20.0 mL of H$$_2SO$_4. $$What is the molarity of the H$$_2SO$_4$$ solution? (Use $$n_aM_aV_a = n_bM_bV_b$$ with $$n_a=2$$, $$n_b=1)$$

Accepted Answer

$$1.6 M$$

Question 6

A 18.5 g block of copper at $$99.5^\circC is $$placed in 58.5 mL of water at $$22.3^\circC. $$The final temperature is $$26.1^\circC. $$What is the specific heat ($$C_p) of $$copper? (Assume $$C_{water} = 4.18 J/g$^\circC$$, density of water = 1.0 g/mL)

Accepted Answer

$$0.684 J/g$^\circC$$

Question 7

Which of the following best describes a buffer solution?

Accepted Answer

A solution that resists changes in pH when small amounts of acid or base are added.

Question 8

Which equation correctly represents the relationship used in titration calculations?

Accepted Answer

$$n_aM_aV_a = n_bM_bV_b$$

Question 9

Which of the following is NOT a property of acids?

Accepted Answer

They feel slippery to the touch.

Question 10

A sample of gas occupies 4.00 L at 1.00 atm and 300 K. What will be its volume at 2.00 atm and 300 K, assuming ideal gas behavior?

Accepted Answer

$$2.00 L$$

Question 11

Which law states that the volume of a gas is directly proportional to its temperature at constant pressure?

Accepted Answer

Charles's Law

Question 12

Which of the following reactions is a decomposition reaction?

Accepted Answer

$$	ext{CuCO}_3(s) \xrightarrow{\Delta} 	ext{CuO}(s) + 	ext{CO}_2(g)$$

Question 13

Which of the following best describes an exothermic process?

Accepted Answer

A process that releases heat to the surroundings.

Question 14

If 100.0 g of water at $$25.0^\circC $$absorbs 836 J of heat, what is the final temperature of the water? ($$C_p = 4.18 J/g$^\circC)$$

Accepted Answer

$$27.0^\circC$$

Question 15

Which of the following is the correct balanced equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$	ext{HCl}(aq) + 	ext{NaOH}(aq) ightarrow 	ext{NaCl}(aq) + 	ext{H}_2	ext{O}(l)$$

Question 16

Which of the following statements about the ideal gas law is correct?

Accepted Answer

It combines Boyle's, Charles's, and Avogadro's laws.

Question 17

Which of the following is a characteristic of bases?

Accepted Answer

They turn red litmus paper blue.

Question 18

A buffer solution is made by mixing acetic acid and sodium acetate. What happens when a small amount of HCl is added to this buffer?

Accepted Answer

The pH decreases slightly, but remains relatively constant.

Question 19

Which of the following best describes potential energy in a chemical system?

Accepted Answer

Energy stored in chemical bonds.

Question 20

Which of the following is the correct formula for copper (II) carbonate?

Accepted Answer

$$	ext{CuCO}_3$$

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