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. dissolving 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

instructions: classify each of the following as an intensive property i or an extensive property e.

1. mass
2. density
3. melting point
4. color
5. volume
6. length

Explanation:

• Physical vs Chemical Properties:
• Physical properties can be observed without changing the substance's chemical identity. Examples: Color (21), Density (22), Boils at \(450^{\circ}C\) (25), Good conductor of heat (27), Dissolves readily in water (28), Melts at \(145^{\circ}C\) (29), Malleable (30).
• Chemical properties describe a substance's ability to undergo chemical change. Examples: Burns easily (flammable) (23), Not affected by acids (24), Reacts violently with chlorine (26).
• Physical vs Chemical Changes:
• Physical changes don't alter the substance's chemical composition. Examples: Grinding chalk into powder (31), Dissolving salt in water (32), Tearing a piece of paper (34), Stretching copper into wire (35), Hammering gold into foil (37), Melting ice (38).
• Chemical changes result in new substances. Examples: Dissolving zinc in acid (33), Burning gasoline (36), Digesting food (39), Making hydrogen from water (40).
• Intensive vs Extensive Properties:
• Intensive properties don't depend on the amount of substance. Examples: Density (42), Melting point (43), Color (46).
• Extensive properties depend on the amount of substance. Examples: Mass (41), Volume (47), Length (48).

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
21. E
22. I
23. I
24. I
25. E
26. E