Q: A student mixes 0.50 mol of NaCl with 1.00 L of water. What is the molarity of the resulting solution?

$$M = \frac{0.50\ \text{mol}}{1.00\ \text{L}} = 0.50\ \text{M}$$

Q: Which of the following is a balanced equation for the reaction between hydrochloric acid and sodium hydroxide?

$$\text{HCl} + \text{NaOH} \rightarrow \text{NaCl} + \text{H}_2\text{O}$$

Q: A reaction has an activation energy of $$50\ \text{kJ/mol}$$ and releases $$30\ \text{kJ/mol} of $$energy. Which statement is true?

The reactants have $$30\ \text{kJ/mol}$$ more energy than the products

Q: Which of the following is the correct formula for calculating the number of moles from mass and molar mass?

$$n = \frac{\text{mass}}{\text{molar mass}}$$

Q: A solution is prepared by dissolving $$10.0\ \text{g} of $$glucose ($$\text{C}_6\text{H}_{12}\text{O}_6$$, molar mass $$180\ \text{g/mol}) in $$enough water to make $$500\ \text{mL} of $$solution. What is the molarity of the solution?

$$M = \frac{10.0\ \text{g}}{180\ \text{g/mol} \times 0.500\ \text{L}} = 0.11\ \text{M}$$

Q: A patient receives $$250\ \text{mL} of a$$ $$0.9\%$$ saline solution. How many grams of NaCl did the patient receive?

$$0.9\ \text{g}/100\ \text{mL} \times 250\ \text{mL} = 2.25\ \text{g}$$

Question 1

Which of the following changes will most likely increase the rate of a chemical reaction between two aqueous solutions?

Accepted Answer

Increasing the concentration of the reactants

Question 2

Consider the following energy diagram for a chemical reaction. Which statement best describes an exothermic reaction?

Accepted Answer

The reactants have higher energy than the products

Question 3

A student mixes 0.50 mol of NaCl with 1.00 L of water. What is the molarity of the resulting solution?

Accepted Answer

$$M = \frac{0.50\ 	ext{mol}}{1.00\ 	ext{L}} = 0.50\ 	ext{M}$$

Question 4

Which of the following is a balanced equation for the reaction between hydrochloric acid and sodium hydroxide?

Accepted Answer

$$	ext{HCl} + 	ext{NaOH} ightarrow 	ext{NaCl} + 	ext{H}_2	ext{O}$$

Question 5

A reaction has an activation energy of $$50\ 	ext{kJ/mol}$$ and releases $$30\ 	ext{kJ/mol} of $$energy. Which statement is true?

Accepted Answer

The reactants have $$30\ 	ext{kJ/mol}$$ more energy than the products

Question 6

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

Accepted Answer

Color of the reactants

Question 7

A sample of gas occupies $$2.0\ 	ext{L} at$$ $$1.0\ 	ext{atm}$$ pressure. If the pressure is increased to $$2.0\ 	ext{atm} at $$constant temperature, what is the new volume?

Accepted Answer

$$1.0\ 	ext{L}$$

Question 8

Which of the following is the correct formula for calculating the number of moles from mass and molar mass?

Accepted Answer

$$n = \frac{	ext{mass}}{	ext{molar mass}}$$

Question 9

A solution is prepared by dissolving $$10.0\ 	ext{g} of $$glucose ($$	ext{C}_6	ext{H}_{12}	ext{O}_6$$, molar mass $$180\ 	ext{g/mol}) in $$enough water to make $$500\ 	ext{mL} of $$solution. What is the molarity of the solution?

Accepted Answer

$$M = \frac{10.0\ 	ext{g}}{180\ 	ext{g/mol} 	imes 0.500\ 	ext{L}} = 0.11\ 	ext{M}$$

Question 10

Which of the following best describes a double displacement (ID) reaction?

Accepted Answer

Two compounds exchange ions to form two new compounds

Question 11

A patient receives $$250\ 	ext{mL} of a$$ $$0.9\%$$ saline solution. How many grams of NaCl did the patient receive?

Accepted Answer

$$0.9\ 	ext{g}/100\ 	ext{mL} 	imes 250\ 	ext{mL} = 2.25\ 	ext{g}$$

Question 12

Which gas law describes the relationship between pressure and volume at constant temperature?

Accepted Answer

Boyle's Law: $$P_1V_1 = P_2V_2$$

Question 13

A reaction mixture is heated, and the rate of reaction doubles. Which factor is responsible for this change?

Accepted Answer

Increase in temperature

Question 14

Which of the following is the correct balanced equation for the double displacement reaction between silver nitrate and sodium chloride?

Accepted Answer

$$	ext{AgNO}_3 + 	ext{NaCl} ightarrow 	ext{AgCl} + 	ext{NaNO}_3$$

Question 15

A $$2.0\ 	ext{L}$$ sample of gas at $$300\ 	ext{K} is $$heated to $$600\ 	ext{K} at $$constant pressure. What is the new volume?

Accepted Answer

$$4.0\ 	ext{L}$$

Question 16

Which of the following statements about solutions is correct?

Accepted Answer

The solvent is the component present in the largest amount

Question 17

A chemical reaction has a high activation energy. What does this imply about the reaction rate?

Accepted Answer

The reaction will proceed slowly at room temperature

Question 18

A $$0.25\ 	ext{mol}$$ sample of oxygen gas ($$	ext{O}_2) is at$$ $$1.0\ 	ext{atm}$$ and $$273\ 	ext{K}. $$What is its volume according to the ideal gas law ($$PV = nRT$$), using $$R = 0.0821\ 	ext{L} \cdot 	ext{atm} / 	ext{mol} \cdot 	ext{K}$$?

Accepted Answer

$$V = \frac{nRT}{P} = \frac{0.25 	imes 0.0821 	imes 273}{1.0} = 5.6\ 	ext{L}$$

Question 19

Which of the following best explains why increasing the concentration of reactants increases the rate of reaction?

Accepted Answer

It increases the number of collisions between reactant molecules

Key Topics in GOB Chemistry: Reaction Rates, Energy Diagrams, Gas Laws, Moles, and Solutions

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