Unit 2 Test Alternate

  1. What energy value of the reactants? ______
  2. What is the energy value of the products? ______
  3. What is the overall energy change for the reaction? ______
  4. Is this reaction exothermic or endothermic? ______
  5. What is the activation energy for the reaction? ______
  6. Use a dashed line on the above diagram to show how the energy diagram might look if a catalyst was used for this reaction.

Collision Theory states that in order for a reaction to occur, the reactants must

  • Collide,
  • Have sufficient energy, and
  • Have the correct orientation.

Explain how changing each of the following variables would increase the reaction rate. Your explanation should refer to one or more of the requirements of the collision theory.

  1. Increasing the temperature:
  1. Increasing the amount of reactants
  1. Adding a catalyst
  1. The diagram below represents the natural formation of ozone molecules.

1.
/ → / 2.
/ → / 3.
/ → / 4.

a.In which part of earth’s atmosphere does this process occur? ______

b.Use words and drawings of ozone molecules (like those shown above in figure 4) to show how the ozone layer protects the earth from harmful UV radiation.

c.CFCs are considered a threat to the ozone layer. Where do CFCs come from and how do they get into the atmosphere?

d.Use the drawing below to show which part of the CFC is a threat to the ozone layer and how it becomes separated from the molecule.

  1. Catalytic converters are placed on automobiles to reduce the emissions of 3 types of harmful compounds into the environment.
  1. List one of the 3 compounds ______
  1. What is the risk from releasing this compound into the environment? (be specific)

______

  1. What substance(s) is this compound converted into before it leaves the catalytic converter?

______

  1. What does the term adsorption mean and how does it relate to the catalyst in a catalytic converter?
  1. Use labeled drawings to show how the compound you listed in 11a is converted into the substances you listed in 11c.
  1. In the lab, you used several catalysts (powder form) and an enzyme (catalase in liver and potato) to change the rate of the decomposition of hydrogen peroxide into water and oxygen.
  2. In what ways are catalysts and enzymes similar?
  1. In what important ways are catalysts and enzymes different?