Year 9 Homework – Acids and Bases Name: ______

Questions on Acids and Bases Due Date : ______

  1. What is the taste of most acids?
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  2. Give 3 natural sources of acids.
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  3. What is the acid formed when carbon dioxide is dissolved in water? Where can you find this acid?
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  4. What happens when a metal like magnesium is placed in a test tube of acid? Which gas is produced?
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  5. Why do acids dangerous?
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  6. All acids contain ______that will be released in solution to give the acidic properties.
  7. Name the acids found in food and drinks.
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  8. Name a strong acid: ______and a weak acid: ______.
  9. What are alkalis?
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  10. What should you do when you have a spillage of acid or alkali on your skin?
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  11. Name 4 common bases at home and give their uses.
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  12. What is the meaning of neutralisation?
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  13. Why do we use toothpaste for cleaning teeth?
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  14. Which acid is found in our stomach? Which chemical can be taken to neutralise excess acid in the stomach?
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  15. Hydrangea appears in different colour in different soil. Why? ______
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  16. What is an “Indicator”?
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  17. Give 3 natural indicators.
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  18. Litmus paper is used to test for acid or base.
    Blue litmus à Red indicates the solution is ______(acidic/alkali)
    Red litmus à Blue indicates the solution is ______(acidic/alkali)
  19. If a solution does not change the colour of the red litmus, what can you tell about this solution?
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  20. Why is pH paper a better choice than litmus paper?
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  21. What is the difference between a pH 1 and pH 5? Which pH stands for “Neutral”?
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