Q: A sample contains 3.00 moles of NaCl. What is the mass of this sample in grams? ($$M_{NaCl} = 58.44\ \mathrm{g/mol})$$

$$3.00\ \mathrm{mol} \times 58.44\ \mathrm{g/mol} = 175.32\ \mathrm{g}$$

Q: Given the reaction: $$2\mathrm{Al} + 3\mathrm{Cl}_2 \rightarrow 2\mathrm{AlCl}_3$$, how many moles of AlCl$$_3$$ are produced from 6.0 moles of Cl$$_2$$?

$$6.0\ \mathrm{mol}\ \mathrm{Cl}_2 \times \frac{2\ \mathrm{mol}\ \mathrm{AlCl}_3}{3\ \mathrm{mol}\ \mathrm{Cl}_2} = 4.0\ \mathrm{mol}\ \mathrm{AlCl}_3$$

Q: Which of the following is the correct formula for calculating the molarity ($$M) of a $$solution?

$$M = \frac{\text{moles of solute}}{\text{liters of solution}}$$

Q: A gas occupies 2.0 L at 1.0 atm and 300 K. What will be its volume at 2.0 atm and 300 K? (Assume ideal gas behavior.)

$$V_2$$ = $$V_1$$ \times \frac{$$P_1$$}{$$P_2$$} = 2.0\ \mathrm{L} \times \frac{1.0\ \mathrm{atm}}{2.0\ \mathrm{atm}} = 1.0\ \mathrm{L}$$

Question 1

Which of the following statements best describes the difference between an element and a compound?

Accepted Answer

An element is a pure substance made of only one type of atom, while a compound is a substance made of two or more different elements chemically bonded together.

Question 2

A sample contains 3.00 moles of NaCl. What is the mass of this sample in grams? ($$M_{NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$3.00\ \mathrm{mol} 	imes 58.44\ \mathrm{g/mol} = 175.32\ \mathrm{g}$$

Question 3

Which of the following is the correct electron configuration for a neutral atom of sulfur ($$Z=16$$)?

Accepted Answer

$$1s^2$$\ $$2s^2$$\ $$2p^6$$\ $$3s^2$$\ $$3p^4$$

Question 4

Which of the following compounds is most likely to be ionic?

Accepted Answer

NaCl

Question 5

Given the reaction: $$2\mathrm{Al} + 3\mathrm{Cl}_2 \rightarrow 2\mathrm{AlCl}_3$$, how many moles of AlCl$$_3$$ are produced from 6.0 moles of Cl$$_2$$?

Accepted Answer

$$6.0\ \mathrm{mol}\ \mathrm{Cl}_2 	imes \frac{2\ \mathrm{mol}\ \mathrm{AlCl}_3}{3\ \mathrm{mol}\ \mathrm{Cl}_2} = 4.0\ \mathrm{mol}\ \mathrm{AlCl}_3$$

Question 6

Which of the following is the correct net ionic equation for the reaction between aqueous Na$$_2SO$_4$$ and BaCl$$_2$$?

Accepted Answer

$$\mathrm{Ba}^{2+}(aq) + \mathrm{SO}_4$$^{2-}$$(aq) \rightarrow \mathrm{BaSO}_4(s)$$

Question 7

Which of the following acids is a strong acid?

Accepted Answer

HNO$$_3$$

Question 8

A solution is prepared by dissolving 0.50 mol of NaOH in enough water to make 1.0 L of solution. What is the concentration of NaOH?

Accepted Answer

$$0.50\ \mathrm{mol/L}$$

Question 9

Which of the following is the correct balanced chemical equation for the combustion of methane?

Accepted Answer

$$\mathrm{CH}_4 + 2\mathrm{O}_2 \rightarrow \mathrm{CO}_2 + 2\mathrm{H}_2\mathrm{O}$$

Question 10

Which of the following statements about oxidation numbers is correct?

Accepted Answer

The oxidation number of oxygen in most compounds is $$-2.$$

Question 11

Which of the following is the correct formula for calculating the molarity ($$M) of a $$solution?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{liters of solution}}$$

Question 12

A gas occupies 2.0 L at 1.0 atm and 300 K. What will be its volume at 2.0 atm and 300 K? (Assume ideal gas behavior.)

Accepted Answer

$$V_2$$ = $$V_1$$ 	imes \frac{$$P_1$$}{$$P_2$$} = 2.0\ \mathrm{L} 	imes \frac{1.0\ \mathrm{atm}}{2.0\ \mathrm{atm}} = 1.0\ \mathrm{L}$$

Question 13

Which of the following statements about endothermic and exothermic reactions is correct?

Accepted Answer

Endothermic reactions absorb heat from the surroundings, while exothermic reactions release heat.

Question 14

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

Accepted Answer

$$PV = nRT$$

Question 15

Which of the following molecules has a bent molecular geometry according to the VSEPR model?

Accepted Answer

H$$_2O$$

Question 16

Which of the following is the correct Lewis structure for the nitrate ion ($$\mathrm{NO}_3^-$$)?

Accepted Answer

One nitrogen atom bonded to three oxygen atoms, with one double bond and two single bonds, and a negative charge distributed over the oxygens.

Question 17

Which of the following intermolecular forces is strongest in liquid water?

Accepted Answer

Hydrogen bonding

Question 18

Which of the following statements about atomic radius trends in the periodic table is correct?

Accepted Answer

Atomic radius decreases across a period from left to right.

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