Yr 9 Chemistry

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Across
  1. 4. carbon dioxide is made when an acid reacts with a ---------
  2. 6. acids have a --- pH
  3. 9. a process in which reactants form products
  4. 10. the new substances produced in a reaction
  5. 12. a reaction that absorbs heat
  6. 13. acids and alkalis reaction to make ---- and water
  7. 18. a pure substance made of two or more elements bonded in a specific ratio
  8. 19. a change in ------ is a sign of a chemical reaction
  9. 21. in exothermic reactions, the mixture gets ------
  10. 22. a substance made of two or more elements/compounds mixed together
  11. 23. changes colour to show pH levels
Down
  1. 1. the name of the reaction between an acid and an alkali
  2. 2. a gas made when a metal and an acid react
  3. 3. in endothermic reactions, the mixture gets ------
  4. 5. a reaction that releases heat
  5. 7. when a gas is made in a reaction you will see -------
  6. 8. the smallest particle of any element
  7. 11. a particle made of two or more atoms chemically bonded together
  8. 12. a pure substance made of atoms of the same type
  9. 14. shows reactants, and arrow and products
  10. 15. the test used for hydrogen gas
  11. 16. alkalis have a --- pH
  12. 17. substances with a pH of 7 are -------
  13. 20. the substances that are used in a reaction