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KS3 Chemistry:

Acids + Alkalis
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1. Which of these is a common household acid?

  • A. Soap.
  • B. Water.
  • C. Salt.
  • D. Vinegar.

2. Citric acid is found in oranges and lemons. We can tell the fruit is acidic because it tastes..

  • A. sour.
  • B. sweet.
  • C. cool.
  • D. spicy.
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3. Strong acids can burn skin and react strongly with metals. Which of these is the hazard symbol for corrosive acids?

Hazard Symbol Hazard Symbol Hazard Symbol Hazard Symbol
A B C D

 

4. A 'base' is a substance that...

  • A. can neutralise an acid.
  • B. is solid and acidic.
  • C. cannot dissolve in a liquid.
  • D. is always neutral.

5. Some bases can dissolve in water. Once dissolved it is called..

  • A. a neutral substance.
  • B. an alkali.
  • C. an oxide.
  • D. a concentrated acid.

6. Which one of these is a common alkali?

  • A. Water.
  • B. Hydrochloric acid.
  • C. Sodium hydroxide.
  • D. Lemon juice.

7. Substance X is added to an alkali. The two substances react, resulting in a neutral chemical. Substance X Could be....

  • A. water.
  • B. hydrochloric acid.
  • C. sodium hydroxide.
  • D. a salt.

8. When red cabbage is boiled in water, a purple liquid is formed. This liquid is a natural indicator.

 

red cabbage
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An indicator is a substance that..

  • A. changes colour when an acid / alkali is added.
  • B. heats up when an acid / alkali is added.
  • C. reacts, producing bubbles when an acid / alkali is added.
  • D. produces a solid residue at the bottom when an acid / alkali is added.

9. The pH scale is used to measure acidity and alkalinity. What is the pH of a neutral substance?

  • A. 0
  • B. 7
  • C. 10
  • D. 12

10. What is the highest pH value possible?

  • A. 1
  • B. 7
  • C. 14
  • D. 20