| 1. 1 pt(s). |
The acid in our stomach, that helps to break down food during digestion is | |
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A. | hydrochloric acid |
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B. | nitric acid |
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C. | sulphuric acid |
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D. | vinegar |
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| 2. 1 pt(s). |
An alkali has a pH of | |
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A. | 7 |
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B. | less than 7 |
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C. | greater than 7 |
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D. | 14 |
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| 3. 1 pt(s). |
An acid has a pH of | |
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A. | 7 |
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B. | less than 7 |
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C. | greater than 7 |
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D. | 1 |
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| 4. 1 pt(s). |
An example of a commonly used alkali is | |
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A. | citric acid |
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B. | sodium hydroxide |
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C. | vinegar |
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D. | sodium tartrate |
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| 5. 1 pt(s). |
Ammonia is a weaker alkali than sodium hydroxide. Its pH is likely to be….. | |
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A. | 1 |
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B. | 4 |
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C. | 9 |
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D. | 14 |
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| 6. 1 pt(s). |
Citric acid occurs naturally in……. | |
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A. | potatoes |
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B. | limestone |
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C. | lemons |
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D. | table salt |
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| 7. 1 pt(s). |
Which one of the following statements is correct for acids? Acids | |
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A. | have a pH greater than7 |
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B. | give off a smoke |
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C. | have pH equal to 7 |
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D. | are corrosive |
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| 8. 1 pt(s). |
Maryam stated that a bottle contained a weak acid. She knew this because | |
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A. | she had tested it with pH indicator and found its pH was 1 |
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B. | she had tested it with pH indicator and found its pH was 5 |
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C. | she had tested it with pH indicator and found its pH was 9 |
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D. | she had tested it with pH indicator and found its pH was 13 |
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| 9. 1 pt(s). |
Hamish found a bottle containing a solution. He wasn’t sure what it was, and tested it with pH paper. He said it was a strong alkali. He knew this because | |
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A. | he found it had a pH of 1 |
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B. | he found it had a pH of 5 |
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C. | he found it had a pH of 7 |
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D. | he found it had a pH of 14 |
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| 10. 1 pt(s). |
Which of the following household substances would be an alkali? | |
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A. | apple juice |
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B. | window cleaner |
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C. | Pepsi |
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D. | pure water |
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| 11. 1 pt(s). |
If we add some water to a solution of strong acid | |
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A. | its pH will increase because it becomes more dilute |
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B. | its pH will decrease because it becomes more dilute |
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C. | its pH will increase because it becomes more concentrated |
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D. | its pH will decrease because it becomes more concentrated |
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| 12. 1 pt(s). |
Choose the word from the options to correctly complete the following statement. The ___________ scale measures the acidity of a substance | |
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A. | neutral |
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B. | pH |
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C. | acid |
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D. | litmus paper |
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E. | universal indicator |
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| 13. 1 pt(s). |
When in the presence of a strong acid Universal indicator turns | |
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A. | red |
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B. | yellow |
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C. | green |
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D. | blue |
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E. | purple |
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| 14. 1 pt(s). |
When in the presence of a weak alkali, Universal indicator turns | |
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A. | red |
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B. | yellow |
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C. | green |
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D. | blue |
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E. | purple |
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| 15. 1 pt(s). |
A student tested a solution with Universal indicator. It turned yellow. This most likely meant that the solution he had was | |
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A. | a strong acid |
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B. | a strong alkali |
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C. | a weak acid |
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D. | a weak alkali |
