The amount of energy needed for this chemical reaction to begin is shown by the line rising from the reactants. What is this energy called?

A. chemical energy

B. electrical energy

C. activation energy

D. mechanical energy

4. Suppose that this reaction needs a catalyst to proceed. In the absence of a catalyst, the activation energy would be which of the following?

F. larger than what is shown

G. the same as what is shown

H. smaller than what is shown

J. not much different from what is shown

5. What is an aqueous solution that contains more hydroxide ions than hydronium ions called?

C. a solid

D. an acid

DIRECTIONS: Complete the following analogy.

G. gain

H. take

J. forfeit

INTERPRETING GRAPHICS: The illustration below is a space-filling model of water. Use the model to answer the following question.

7. The water molecule above has partial positive charges on the hydrogen atoms and a partial negative charge on the oxygen atom. What can you conclude from this information and the diagram of the water molecule?

B. Water is a polar molecule.

C. Water needs a proton and two electrons to be stable.

D. Oxygen atoms and hydrogen atoms have opposite charges.

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