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6. what is an independent variable

  • temperature
  • measure
  • change
  • stay the same

7. Co2 test

  • limewater turns milky
  • popping noise
  • flames
  • cotton wool test

8. define rate

  • patricles colliding
  • speeds things up
  • how fast something is
  • quickly reacting

9. what changes can occur after a chemical reaction

  • temp,colour,gas
  • fizzing
  • smell
  • appearance

10. which of these does a chemical reaction require

  • particle collisions
  • no activation energy
  • bunsen burner
  • enzymes

11. what happens if there is more surface area

  • more reactants are exposed
  • larger area for particles
  • quicker recation time
  • quicker collisions

12. what is precipitation

  • mass loss
  • evapouration
  • liquid to solid
  • water vapour