1.Which of the following is the best example of an open system?

A. A cup of coffee

B. Our universe

C. A greenhouse

D.An insulated gas cylinder

2.Which of the following best expresses the definition of a closed system?

A. Energy can enter or leave the system but matter cannot.

B. Heat and matter are both able to enter or leave the system.

C. Matter can enter or leave the system but energy cannot.

D. Heat and matter can enter the system but cannot leave the system.

3.Which term below best describes a potential energy diagram in which the potential energy value of the reactants is less than that of the products?

A. Activation energy

B. Calorimetry

C. Exothermic process

D. Endothermic process

4.When a given reaction is conducted in a calorimeter, energy is absorbed from the surrounding water, resulting in a decrease in the water's temperature. Which of the following potential energy diagrams best illustrates the energy change of this dissolving process?

A.

B.

C.

D.

5.An endothermic process is one in which heat is ________ the surroundings

A. gained from

B. increased in

C. lost to

D. repelled by

6.An exothermic reaction is conducted in an insulated calorimeter filled with water. The calorimeter is then sealed so that there is no heat exchanged between the contents of the container and the surrounding air. Which of the following statements is true about the reaction?

A. The thermometer in the water will show a decrease in temperature.

B. The potential energy of the products will be higher than that of the reactants.

C. The water increases in temperature as the reaction gives off energy.

D. The total energy of the reaction will increase.

7.A 20 gram piece of metal is added to a sample of 100 grams of water inside a calorimeter. If the metal is at a temperature of -5° Celsius and the water is at 20° Celsius, which of the following best describes what will occur inside the calorimeter?

A. The final temperature of the water will be 15° Celsius.

B. The energy gained by the metal equals the energy lost by the water.

C. The final temperature of the water will be higher than the initial temperature.

D. The temperature lost by the water will equal the temperature gained by the metal.

8.A sample of gas has increased in temperature from 20° Celsius to 22° Celsius. Which of the following happens as the temperature of the gas goes up?

A.The gas undergoes a phase change.

B. The velocity of the gas particles decreases.

C. The kinetic energy of the particles increases.

D. An exothermic reaction is more likely to occur.

9.According to the collision theory, what happens in a collision without sufficient energy or correct orientation?

A. No products will be formed.

B. Only a small amount of products is formed.

C. Heat energy is absorbed from the surroundings.

D. An alternative product is formed.

10.Which of the following changes would slow down the rate of a reaction between vinegar and sodium hydroxide?

A. Heating up the vinegar

B. Reducing the amount of vinegar

C. Grinding up the sodium hydroxide

D. Decreasing the volume of the container

11.Which statement best describes how a catalyst affects the reaction rate of a chemical reaction?

A. The addition of a catalyst decreases equilibrium and slows down the reaction.

B. The addition of a catalyst increases the temperature of the reactants and speeds up the reaction.

C. The addition of a catalyst decreases the required activation energy and speeds up the reaction.

D. The addition of a catalyst increases the potential energy of the reactants and slows the reaction.