Year 7 Revision - Reactions

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Across
  1. 2. A _____________change is reversible and no new substances are made.
  2. 4. A substance that makes your skin itch or swell up a little. Hazard symbol shows a cross.
  3. 6. If an acid has a large number of solute particles per unit volume then it is a c___________________ acid.
  4. 8. Chemical changes cannot be undone. We say that they are i________________
  5. 9. Substance made when an acid and alkali react. Examples are sodium chloride and copper sulfate.
  6. 11. A soluble base.
  7. 12. A substance that is made in a chemical reaction.
  8. 13. A starting substance in a chemical reaction.
Down
  1. 1. A positive test for this gas is a squeaky pop when tested with a lit splint.
  2. 3. A table of all the elements, in which elements with similar properties are grouped together.
  3. 5. Acids can eat through materials. We say they are ___________________
  4. 7. A substance that neutralises an acid – those that dissolve in water are called alkalis.
  5. 8. Substances used to identify whether a substance is acidic, alkaline or neutral.
  6. 10. A solution with a pH value less than 7.
  7. 14. Brushing your teeth is an example of a __________________ reaction.