Question 1

A student titrates 25.0 mL of 0.100 M HCl with 0.200 M NaOH. What volume of NaOH is required to reach the equivalence point?

$$\mathrm{HCl(aq) + NaOH(aq) \rightarrow NaCl(aq) + H_2O(l)}$$

Accepted Answer

$$12.5\ \mathrm{mL}$$

Question 2

Which of the following is a correct balanced equation for a gas-evolution reaction between sodium carbonate and hydrochloric acid?

Accepted Answer

$$\mathrm{Na_2CO_3(aq) + 2HCl(aq) \rightarrow 2NaCl(aq) + H_2O(l) + CO_2$(g)}$$

Question 3

What is the oxidation state of sulfur in $$\mathrm{H_2SO_4}$$?

Accepted Answer

$$+6$$

Question 4

Consider the reaction: $$\mathrm{2Na(s) + Cl_2$(g) \rightarrow 2NaCl(s)}. $$Which species is the oxidizing agent?

Accepted Answer

$$\mathrm{Cl_2$}$$

Question 5

Which of the following reactions is spontaneous under standard conditions?

Accepted Answer

$$\mathrm{Zn(s) + Cu$$^{2+}$$(aq) \rightarrow Zn$$^{2+}$$(aq) + Cu(s)}$$

Question 6

Convert a pressure of $$760\ \mathrm{mmHg} to $$atmospheres.

Accepted Answer

$$1.00\ \mathrm{atm}$$

Question 7

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

Accepted Answer

$$2.00\ \mathrm{L}$$

Question 8

A $$0.500\ \mathrm{mol}$$ sample of an ideal gas is at $$273\ \mathrm{K}$$ and $$2.00\ \mathrm{atm}. $$What is its volume? Use $$R = 0.0821\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$}$$.

$$PV = nRT$$

Accepted Answer

$$5.69\ \mathrm{L}$$

Question 9

A mixture contains $$2.0\ \mathrm{mol} of$$ $$\mathrm{O_2$}$$ and $$3.0\ \mathrm{mol} of$$ $$\mathrm{N_2$} in a$$ $$10.0\ \mathrm{L}$$ container at $$300\ \mathrm{K}. $$What is the partial pressure of $$\mathrm{O_2$}$$? (Assume ideal gas behavior, $$R = 0.0821\ \mathrm{L\cdot atm\cdot $$mol^{-1}$$\cdot K$$^{-1}$$})$$

Accepted Answer

$$4.92\ \mathrm{atm}$$

Question 10

How many grams of $$\mathrm{CO_2$}$$ are produced when $$10.0\ \mathrm{g} of$$ $$\mathrm{C_2H_5OH} ($$ethanol, molar mass $$46.07\ \mathrm{g/mol}) is $$completely combusted?

$$\mathrm{C_2H_5OH(l) + 3O_2(g) \rightarrow 2CO_2(g) + 3H_2O(l)}$$

Accepted Answer

$$13.0\ \mathrm{g}$$

Question 11

Which of the following statements best describes the kinetic molecular theory of gases?

Accepted Answer

Gas particles move in constant, random motion and collisions between them are perfectly elastic.

Question 12

Which of the following is NOT a redox reaction?

Accepted Answer

$$\mathrm{HCl(aq) + NaOH(aq) \rightarrow NaCl(aq) + H_2O(l)}$$

Question 13

A weather balloon is filled with $$5.00\ \mathrm{L} of $$helium at $$1.00\ \mathrm{atm}$$ and $$300\ \mathrm{K}. If $$the balloon rises to a region where the pressure is $$0.500\ \mathrm{atm}$$ and the temperature is $$250\ \mathrm{K}$$, what is the new volume of the balloon?

$$\frac{P_1V_1}{T_1$} = \frac{P_2V_2}{T_2$}$$

Accepted Answer

$$7.50\ \mathrm{L}$$

Question 14

Which of the following best explains why increasing the temperature of a gas at constant volume increases its pressure?

Accepted Answer

The gas particles move faster and collide with the walls more frequently and with greater force.

Question 15

Which of the following is the correct conversion between $$1.00\ \mathrm{atm}$$ and $$\mathrm{kPa}$$?

Accepted Answer

$$1.00\ \mathrm{atm} = 101.3\ \mathrm{kPa}$$

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