Across
- 5. a measure of how many particles are present in a volume of solution
- 7. substance that speeds up a chemical reaction but is not used up
- 8. the chemical name for burning
- 10. the chemicals at the end of a reaction
- 13. the chemicals at the start of a reaction
- 14. a biological catalyst
- 15. an example of an enzyme; found in saliva
Down
- 1. name of the chemical compound we call rust
- 2. physical change when a substance changes from liquid to gas
- 3. a solid produced from a reaction between two liquids
- 4. a measure of how quickly a reaction happens
- 5. when reactant particles 'bump into each other'
- 6. a measure of the heat energy of particles
- 9. the presence of these in a reaction shows a gas is released
- 11. the element that a substance reacts with when it burns
- 12. a new substance is ______ made in a chemical reaction