Question 1

Which of the following best describes the limiting reactant in a chemical reaction?

Accepted Answer

The reactant that is completely consumed first, stopping the reaction.

Question 2

Given the balanced equation: $$2H_2 + O_2$ \rightarrow 2H_2O$$, if you start with 4 moles of $$H_2$$ and 2 moles of $$O_2$$, how many moles of $$H_2O$$ can be produced?

Accepted Answer

4 moles

Question 3

A 105 mL solution contains 254 g of $$CaCl_2. $$What is the molarity of the solution? (Molar mass of $$CaCl_2 = 110.98$ g/mol)

Accepted Answer

$$21.5\ M$$

Question 4

Which of the following compounds is insoluble in water?

Accepted Answer

$$AgCl$$

Question 5

What is the net ionic equation for the reaction between $$AgNO_3(aq$$)$$ and $$NaI(aq)$$?

Accepted Answer

$$Ag^+(aq) + I^-(aq) \rightarrow AgI(s)$$

Question 6

A 500 mL sample of sulfuric acid is titrated with $$0.01000\ M$$ $$NaOH. If$$ $$22.05\ mL of$$ $$NaOH is $$required to reach the equivalence point, what is the molarity of the $$H_2SO_4$$ solution? (Balanced equation: $$H_2SO_4 + 2NaOH \rightarrow 2H_2O + Na_2SO_4)$$

Accepted Answer

$$0.000441\ M$$

Question 7

Which of the following statements about strong and weak electrolytes is correct?

Accepted Answer

Strong electrolytes completely dissociate in water.

Question 8

What is the oxidation number of sulfur in $$SO_4$$^{2-}$$?

Accepted Answer

$$+6$$

Question 9

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction where an insoluble solid forms from two aqueous solutions.

Question 10

A sample of nitrogen gas is collected over water at $$20.0\ ^\circ C$$ and a total pressure of $$1.00\ atm. $$The vapor pressure of water at this temperature is $$17.5\ torr. $$What is the partial pressure of nitrogen gas in atm?

Accepted Answer

$$0.977\ atm$$

Question 11

Which of the following is the correct expression for the ideal gas law?

Accepted Answer

$$PV = nRT$$

Question 12

A 1.3 mole sample of argon gas is at $$25^\circ C$$ and $$1142\ torr. $$What is its volume in liters? ($$R = 0.08206\ L\cdot atm/(mol\cdot K)$$, $$1\ atm = 760\ torr)$$

Accepted Answer

$$24.7\ L$$

Question 13

According to Graham’s Law, which gas will effuse faster: $$H_2 or$$ $$O_2$$?

Accepted Answer

$$H_2$$ because it is lighter.

Question 14

Which of the following best explains why real gases deviate from ideal behavior at high pressures?

Accepted Answer

Attractive forces between particles become significant.

Question 15

What is the root-mean-square speed ($$u_{rms}) of a $$nitrogen molecule at $$32^\circ C$$? ($$M = 28.0\ g/mol$$, $$R = 8.314\ J/(mol\cdot K)$$, $$T = 305\ K)$$

Accepted Answer

$$511\ m/s$$

Question 16

Which of the following is a correct statement about the kinetic molecular theory of gases?

Accepted Answer

The average kinetic energy of gas particles is proportional to the temperature in Kelvin.

Question 17

A 2.0 L bottle contains 0.25 mol $$N_2$$ and 0.32 mol $$O_2 at$$ $$32^\circ C. $$What is the total pressure in the bottle? ($$R = 0.08206\ L\cdot atm/(mol\cdot K))$$

Accepted Answer

$$3.0\ atm$$

Question 18

Which of the following is the correct balanced equation for the combustion of ethanol ($$C_2H_5OH$$)?

Accepted Answer

$$C_2H_5OH + 3O_2 \rightarrow 2CO_2 + 3H_2O$$

Question 19

Which of the following is a spectator ion in the reaction: $$AgNO_3(aq) + $$NaI(aq) \rightarrow AgI(s) + $$NaNO_3(aq$$)$$?

Accepted Answer

$$Na^+$$

General Chemistry Study Guide: Chemical Reactions, Solutions, and Gases

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