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KS3 Chemistry:

Acids + Alkalis




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.
Jaromir Novota

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


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

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