Question

1.​Acidic materials can be identified by which of the following test outcomes:

​

​a. They react with metals.

​b. They feel slippery.

​c. They may taste bitter.

​ ​d. They turn litmus paper red.

​e. All of the above.

2. Which of the following would you expect to turn litmus paper blue:

​​a. chalk

​b. baking soda

​c. oven cleaner

​ ​d. all of the above

​e. none of the above

3. Which of the following statements about acidic water is true?

​ a. Acid has no effect on the H2O molecules.

​b. The solution contains a larger number of OH- ions than H3O+ ions.

​c. The solution contains a larger number of H3O+ ions than OH- ions.

​ ​d. The solution contains an equal number of H3O+ ions and OH- ions.

​e. none of the above.

4. What is the expected change in the pH under the following conditions: acid is added to the solution.

​ a. It is not possible to answer without the identity of the acid.

​b. The pH will increase.

​c. The pH will decrease.

​ ​d. The pH will stay the same.

​e. The pH will fluctuate and then stabilize.

5. Metal carbonates are weak bases. They react with acids to release carbon dioxide. What does that mean regarding the metal ions that make up the carbonate salt?

​ a. The amount of metal ion in solution stays the same as pH changes.

​b. The amount of metal ion in solution decreases as pH drops.

​c. The amount of metal ion in solution increases as pH drops.

d. The amount of metal ion in solution depends on the strength of the acid.

​e. None of the above

6. Which of the following are the most likely side effects of ocean acidification?

​ a. a pH less than 7.0 in the ocean

​b. more metal salts altering the ocean chemistry

​c. dissolution of the shells of marine organisms

​ ​d. Both a & b

​e. All of the above.

7. Seltzer water is created by placing water under pressure with carbon dioxide gas. Which of the following statements best describe seltzer water:

​ a. The solution will be slightly acidic.

​b. The solution will be slightly basic.

c. ​The solution will be strongly acidic.

​ ​d. The solution will be strongly basic.

​e. The solution will be neutral.

8. You encounter a solution that is acidic and you decide to test it by adding a small amount of a strong acid. The pH lowers slightly but is approximately unchanged, and still remains acidic. What can you say about the solution?

​ a. It is a buffer solution.

​b. It is not a buffer solution

c. ​It is a strong acid solution.

​ ​d. The solution has been neutralized.

​e. The solution has excess acid present.

9. Which of the following would you expect to turn litmus paper red:

​​a. saliva

​b. blood

​c. tears

​ ​d. gastric juices

​e. none of the above

10. Most bodily fluids, except for a few notable exceptions have components that are:

​​a. either weak acids or weak bases

​b. either strong acids or strong bases

​c. buffers

​ ​d. All of the above.

​e. None of the above.