Across
- 3. states that no atoms are lost or made in a chemical reaction.
- 4. A substance that reacts together with another substance to form products during a chemical reaction.
- 6. Occur when a new substance is formed.
- 9. Type of reaction in which a compound breaks down to form two or more substances when it is heated.
- 12. Reaction in which energy is given out to the surroundings.
- 13. Gases or other substances can enter or leave during a reaction.
- 14. The process of burning by heat.
- 15. Occur when the form of a chemical substance is changed (rather than what a substance is made of).
Down
- 1. Chart showing the energy in the reactants and products, and the difference in energy between them.
- 2. The minimum amount of energy that colliding particles must have for them to react.
- 5. No substances can enter or leave during a reaction.
- 7. Scientific skill whereby scientists receive knowledge of the outside world through our sense.
- 8. Reaction in which energy is taken in from the surroundings.
- 10. A substance formed in a chemical reaction.
- 11. A catalyst is a substance that speeds up a chemical reaction without being used up or chemically changed.