Question

instructions: classify each of the following properties of matter as physical p or chemical c.

1. color
2. density
3. burns easily (flammable)
4. not affected by acids
5. boils at 450 °c
6. reacts violently with chlorine
7. good conductor of heat
8. dissolves readily in water
9. melts at 145 °c
10. malleable

instructions: classify each of the following changes in matter as physical p or chemical c.

1. grinding chalk into powder
2. dissolving salt in water
3. reacting zinc in acid
4. tearing a piece of paper
5. stretching copper into wire
6. burning gasoline
7. hammering gold into foil
8. melting ice
9. digesting food
10. making hydrogen from water

Explanation:

Physical properties are observable/measurable without changing matter's identity. Chemical properties describe matter's ability to change into new substances. Physical changes alter form but not composition; chemical changes form new substances.

Answer:

1. [P]
2. [P]
3. [C]
4. [C]
5. [P]
6. [C]
7. [P]
8. [P]
9. [P]
10. [P]
11. [P]
12. [P]
13. [C]
14. [P]
15. [P]
16. [C]
17. [P]
18. [P]
19. [C]
20. [C]