Q: A sample contains 2.00 moles of NaCl. What is the mass of the sample in grams? ($$M_{NaCl} = 58.44\ \mathrm{g/mol})$$

$$2.00\ \mathrm{mol} \times 58.44\ \mathrm{g/mol} = 116.88\ \mathrm{g}$$

Q: A gas sample has a volume of 2.0 L at 1.0 atm and 300 K. What will the volume be 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 2.00 moles of NaCl. What is the mass of the sample in grams? ($$M_{NaCl} = 58.44\ \mathrm{g/mol})$$

Accepted Answer

$$2.00\ \mathrm{mol} 	imes 58.44\ \mathrm{g/mol} = 116.88\ \mathrm{g}$$

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

A student mixes 0.50 mol of H$$_2$$ with 0.25 mol of O$$_2 to $$produce water. What is the limiting reactant in the reaction $$2H_2 + O_2$ \rightarrow 2H_2O$$?

Accepted Answer

O$$_2$$

Question 6

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

Accepted Answer

$$Ba^{2+}(aq$$) + $$SO_4$$^{2-}(aq) \rightarrow $$BaSO_4(s$$)$$

Question 7

Which of the following acids is a strong acid?

Accepted Answer

HCl

Question 8

What is the oxidation number of sulfur in H$$_2SO$_4$$?

Accepted Answer

+6

Question 9

A solution is prepared by dissolving 0.10 mol of NaOH in enough water to make 500 mL of solution. What is the molarity of the solution?

Accepted Answer

$$0.10\ \mathrm{mol} / 0.500\ \mathrm{L} = 0.20\ \mathrm{M}$$

Question 10

Which of the following best describes an endothermic reaction?

Accepted Answer

A reaction that absorbs heat from the surroundings, resulting in a positive $$\Delta H$$

Question 11

Which of the following is the correct application of Hess's Law?

Accepted Answer

The enthalpy change for a reaction is the sum of the enthalpy changes for each step in the reaction pathway.

Question 12

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

Accepted Answer

CO$$_2$$

Question 13

Which of the following statements about hybrid orbitals is correct?

Accepted Answer

sp$$^3$$ hybridization involves the mixing of one s orbital and three p orbitals.

Question 14

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

Accepted Answer

Hydrogen bonding

Question 15

A gas sample has a volume of 2.0 L at 1.0 atm and 300 K. What will the volume be 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 16

Which of the following best explains why ionic compounds tend to have high melting points?

Accepted Answer

Strong electrostatic forces between oppositely charged ions require a large amount of energy to break.

Question 17

Which of the following is the correct formula for calculating the density of a substance?

Accepted Answer

$$	ext{Density} = \frac{	ext{Mass}}{	ext{Volume}}$$

Question 18

Which of the following best describes the trend in atomic radius across a period from left to right?

Accepted Answer

Atomic radius decreases due to increasing nuclear charge.

Question 19

Which of the following is the correct Lewis structure for the nitrate ion ($$NO_3$$^-$$)?

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.

General Chemistry I: Final Exam Key Topics and Study Guide

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