Question

physical and chemical properties and changes
name key
physical property

1. observed with senses
2. determined without destroying matter

chemical property

1. indicates how a substance reacts with something else
2. matter will be changed into a new substance after the reaction

identify the following as a chemical (c) or physical property (p):

1. blue color
2. density
3. flammability (burns)
4. solubility (dissolves)
5. reacts with acid
6. supports combustion
7. sour taste
8. melting point
9. reacts with water
10. hardness
11. boiling point
12. luster
13. odor
14. reacts with air

physical change

1. a change in size, shape, or state
2. no new substance is formed

chemical change

1. a change in the physical and chemical properties
2. a new substance is formed

identify the following as physical (p) or chemical (c) changes.

1. nacl (table salt) dissolves in water.
2. ag (silver) tarnishes.
3. an apple is cut.
4. heat changes h₂o to steam.
5. baking soda reacts to vinger.
6. fe (iron) rusts.
7. alcohol evaporates.
8. ice melts.
9. milk sours.
10. sugar dissolves in water.
11. wood rots.
12. pancakes cook.
13. grass grows.
14. a tire is inflated.
15. food is digested.
16. paper towel absorbs water.

Explanation:

• Physical Property Identification:
• Blue color: Observed with senses (physical property).
• Density: Determined without destroying matter (physical property).
• Flammability: Indicates reaction (chemical property).
• Solubility: Determined without destroying matter (physical property).
• Reacts with acid: Indicates reaction (chemical property).
• Supports combustion: Indicates reaction (chemical property).
• Sour taste: Observed with senses (physical property).
• Melting point: Determined without destroying matter (physical property).
• Reacts with water: Indicates reaction (chemical property).
• Hardness: Determined without destroying matter (physical property).
• Boiling point: Determined without destroying matter (physical property).
• Luster: Observed with senses (physical property).
• Odor: Observed with senses (physical property).
• Reacts with air: Indicates reaction (chemical property).
• Physical/Chemical Change Identification:
• NaCl dissolves in water: No new substance (physical change).
• Ag tarnishes: New substance (chemical change).
• Apple is cut: No new substance (physical change).
• Heat changes H₂O to steam: No new substance (physical change).
• Baking soda reacts to vinegar: New substance (chemical change).
• Fe rusts: New substance (chemical change).
• Alcohol evaporates: No new substance (physical change).
• Ice melts: No new substance (physical change).
• Milk sours: New substance (chemical change).
• Sugar dissolves in water: No new substance (physical change).
• Wood rots: New substance (chemical change).
• Pancakes cook: New substance (chemical change).
• Grass grows: New substance (chemical change).
• Tire is inflated: No new substance (physical change).
• Food is digested: New substance (chemical change).
• Paper towel absorbs water: No new substance (physical change).

Answer:

• Physical/Chemical Property:

1. P
2. P
3. C
4. P
5. C
6. C
7. P
8. P
9. C
10. P
11. P
12. P
13. P
14. C

• Physical/Chemical Change:

1. P
2. C
3. P
4. P
5. C
6. C
7. P
8. P
9. C
10. P
11. C
12. C
13. C
14. P
15. C
16. P