Across
- 4. Paper is burnt with oxygen to form carbon dioxide gas and ash. The process is called __________.
- 6. The process of applying a layer on oil to slow down rusting
- 8. The process where iron reacts with water and air
- 9. __________ is a chemical reaction that allows us to derive energy from food.
- 12. By drying food under the sun, we remove _________ which reduces microbial activity
Down
- 1. Tin ________ is used to prevent contact between steel and oxygen.
- 2. All chemical reactions lead to new ___________ being formed.
- 3. Wood, oil, petroleum gas are examples of ______ needed in combustion.
- 5. _________ and moisture is needed for rusting to occur.
- 7. Food decay is caused by _________.
- 10. pH of food is ________ to slow down food decay.
- 11. When food is left in the open for a period of time, this chemical reaction occurs.