Q: Which of the following equations correctly represents the calculation of enthalpy change ($$\Delta H) $$for a reaction using bond energies?

$$\Delta H = \sum \text{Bond energies of bonds broken} - \sum \text{Bond energies of bonds formed}$$

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

$$m = \dfrac{\text{moles of solute}}{\text{kg of solvent}}$$

Question 1

Which of the following best describes the main focus of General Chemistry II (CH 222HZ) at Oregon State University?

Accepted Answer

The exploration and application of principles related to the solid, liquid, and gaseous states of matter, stoichiometry, thermochemistry, kinetics, and equilibrium.

Question 2

A student mixes 50.0 g of water at $$25.0\ ^\circ\mathrm{C}$$ with 50.0 g of water at $$75.0\ ^\circ\mathrm{C}. $$Assuming no heat is lost to the surroundings, what is the final temperature of the mixture? (Specific heat of water $$c = 4.18\ \mathrm{J/g\cdot ^\circ C})$$

Accepted Answer

$$50.0\ ^\circ\mathrm{C}$$

Question 3

Which equation correctly expresses the relationship between pressure, volume, temperature, and number of moles for an ideal gas?

Accepted Answer

$$PV = nRT$$

Question 4

Which of the following statements about intermolecular forces is correct?

Accepted Answer

London dispersion forces are present in all molecular substances.

Question 5

A reaction is found to be first order in A and second order in B. What is the rate law for this reaction?

Accepted Answer

$$	ext{rate} = k[A][B]^2$$

Question 6

Which of the following best explains why salt (NaCl) is used to melt ice on roads in winter?

Accepted Answer

Salt decreases the freezing point of water, causing ice to melt at lower temperatures.

Question 7

Which of the following is the correct expression for the equilibrium constant $$K_c$$ for the reaction: $$\mathrm{N_2$}(g) + 3\mathrm{H_2$}(g) \rightleftharpoons 2\mathrm{NH_3$}(g)$$?

Accepted Answer

$$K_c = \dfrac{[\mathrm{NH_3$}]^2}{[\mathrm{N_2$}][\mathrm{H_2$}]^3}$$

Question 8

A 0.10 M solution of a nonvolatile, nonelectrolyte solute in water has a lower vapor pressure than pure water. Which property of solutions does this illustrate?

Accepted Answer

Colligative properties

Question 9

Which of the following best describes the effect of a catalyst on a chemical reaction?

Accepted Answer

A catalyst decreases the activation energy, increasing the reaction rate without being consumed.

Question 10

Which of the following equations correctly represents the calculation of enthalpy change ($$\Delta H) $$for a reaction using bond energies?

Accepted Answer

$$\Delta H = \sum 	ext{Bond energies of bonds broken} - \sum 	ext{Bond energies of bonds formed}$$

Question 11

A sample of gas occupies 2.00 L at 1.00 atm and $$25.0\ ^\circ\mathrm{C}. $$What will be its volume at 0.500 atm and $$25.0\ ^\circ\mathrm{C}$$, assuming ideal gas behavior?

Accepted Answer

$$4.00\ \mathrm{L}$$

Question 12

Which of the following factors will NOT affect the rate of a chemical reaction?

Accepted Answer

The color of the reactants

Question 13

Which of the following is a correct statement about dynamic equilibrium in a chemical reaction?

Accepted Answer

The rates of the forward and reverse reactions are equal.

Question 14

A solution is prepared by dissolving 10.0 g of NaCl in 100.0 g of water. Which of the following best describes the resulting solution?

Accepted Answer

The solution is a homogeneous mixture.

Question 15

Which of the following best explains why water has a relatively high boiling point compared to other molecules of similar size?

Accepted Answer

Water molecules form strong hydrogen bonds with each other.

Question 16

Which of the following is the correct formula for calculating the molality ($$m) of a $$solution?

Accepted Answer

$$m = \dfrac{	ext{moles of solute}}{	ext{kg of solvent}}$$

Question 17

A reaction has an activation energy of $$50\ \mathrm{kJ/mol}. If a $$catalyst lowers the activation energy to $$20\ \mathrm{kJ/mol}$$, what is the most likely effect on the reaction rate?

Accepted Answer

The reaction rate will increase.

Question 18

Which of the following is a real-world example of a colligative property?

Accepted Answer

The boiling point elevation of water when sugar is added.

Question 19

Which of the following best describes the kinetic molecular theory as it applies to gases?

Accepted Answer

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

General Chemistry II (CH 222HZ) Syllabus and Course Overview

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