Across
- 1. There are two main types of change: physical change and ______ change.
- 4. Other than light, what is a condition for photosynthesis?
- 7. In a chemical reaction word equation, these are found to the left of the arrow.
- 8. These are substances present at the end of a chemical reaction.
- 11. Plants use this process to make food in the presence of light
- 12. ______ decomposition is a process in which a substance is broken down into two or more simpler substances by the effect of heat.
- 14. Cellular ______ releases energy from food, this takes place in the cells of all living things.
- 15. A process in which a substance reacts with oxygen.
Down
- 2. In a chemical reaction word equation, these are factors needed for the reaction to happen.
- 3. Coating a coin with a layer of gold is an example of _____.
- 5. NASA astronauts use this method in space crafts to produce oxygen from water
- 6. Water can convert into ice and ice can convert back into water, this means that physical changes are _______.
- 9. Burning of petrol in cars to produce carbon dioxide and water vapour is an exmaple of complete ______.
- 10. Light can change silver bromide into a grey solid on an X-ray film. What is this grey solid product?
- 13. Cooking a piece of steak is an example of interactions between matter and _____.
- 15. A reactant is missing in this oxidation process, what is it? glucose --> carbon dioxide + water