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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