Physical & Chemical Changes. Explore at your Home a physical change, the original substance still exists, it has changed only in form. Ina a chemical change, a new substance is produced. Energy

Changes always accompany chemical changes. Classify the following as being a physical or a chemical change (P) (C):

1. Sodium hydroxide dissolves in water
2. Hydrochloric acid reacts with Potassium hydroxide to produce a salt, water and heat
3. A chunk of Sugar is sliced in two
4. Water is heated and changed into steam
5. Iron rusts
6. When placed in water, salt dissolves
7. Evaporation
8. Ice melting
9. Milk sours
10. Sugar dissolves in water
11. Wood rotting
12. Pancakes cooking in a griddle
13. Grass growing in a lawn
14. A tire is inflated with air
15. Food is digested in the stomach
16. Water is absorbed by a paper towel
17. Burning a piece of paper
18. Chewing gum
19. Frying an egg
20. Melting ice cream mi