WGU C255 KGO1 Intro to Chemistry

1. What causes values of PV/nRT to be less than one for a real gas?

• Attractive forces
• Molecular volumes
• Reflective walls
• Repulsive forces

2. Which conditions would lead to the largest deviation from ideal gas behavior?

• 0.01 atm and -50°C
• 1 atm and 100°C
• 5 atm and 0°C
• 2000 atm and 0°C

3. What is a major difference between ideal gas molecules and real gas molecules?

• Real gases have a molecular weight of zero.
• Real gases have no attraction to one another.
• Real gases have no kinetic energy.
• Real gases have a nonzero molecular volume.

4. One unit of solid zinc reacts with one unit of copper(II) chloride to yield one unit of zinc chloride and one unit of solid copper.
Zn(s) + CuCl₂(aq) → ZnCl₂(aq) + Cu(s)
What is the correct classification of the balanced chemical equation?

• Synthesis
• Single replacement
• Double replacement
• Decomposition

5. Given: R = 0.08205 L • atm mol • K
What is the volume, in milliliters, of a tank that has 25.3 moles of I₂ gas at 2.45 atm and 315 K?

• 3.93 × 10⁶ mL
• 2.67 × 10² mL
• 3.93 × 10³ mL
• 2.67 × 10⁵ mL

6. What is the pH of a solution that has a hydroxide ion (OH⁻) concentration of 7.8 × 10⁻¹¹ M, and is it an acid or a base?

• pH = 3.89, acid
• pH = 3.89, base
• pH = 10.11, acid
• pH = 10.11, base

7. Given the following chemical reaction that has reached equilibrium:
ClNO₂(g) + NO(g) ⇌ NO₂(g) + ClNO(g)
What will happen to the equilibrium if some ClNO is removed?

• The concentrations of the reactants and the products will not change.
• The reaction will shift to decrease the concentration of the reactants, while increasing the concentration of the products.
• The concentrations of both the reactants and the products will decrease.
• The reaction will shift to increase the concentration of the reactants, while decreasing the concentration of the products.

8. The following balanced equation is exothermic. One mole of gaseous hydrogen reacts with one mole of gaseous fluorine to yield two moles of hydrogen fluoride and heat.
H₂(g) + F₂(g) → 2HF(g) + 130 kcal
Which type of stress would disrupt the equilibrium and cause an increase in the concentration of the reactants?

• Removal of product
• Decrease in temperature
• Increase in pressure
• Increase in temperature

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