Question

practice: physical vs. chemical
part 1: classify the following properties as physical (p) or chemical (c).

1. density
2. flammability
3. boiling point
4. hardness
5. odor
6. taste
7. ability to neutralize a base
8. luster
9. ability to react with water
10. combustibility

part 2: classify the following changes as physical (p) or chemical (c).

1. milk souring.
2. sodium chloride dissolving in water.
3. water heating and changing into steam.
4. iron rusting.
5. wood rotting.
6. sugar added to sweet tea.
7. a bike tire being inflated with air.
8. window glass shattering.
9. a paper towel absorbing spilled water.
10. mowing the lawn.

part 3: write below what criteria you use to determine if something is physical or chemical.

Explanation:

Physical properties can be observed or measured without changing the substance's chemical composition. Chemical properties involve a substance's ability to undergo a chemical change. Physical changes do not change the substance's identity, while chemical changes result in new substances.

1. Density is a physical property as it can be measured without altering the substance chemically.
2. Flammability is a chemical property as it involves a substance burning and changing chemically.
3. Boiling point is a physical property as it is a characteristic related to state - change without chemical alteration.
4. Hardness is a physical property as it can be observed without chemical change.
5. Odor is a physical property as it can be detected without chemical reaction.
6. Taste is a physical property as it can be sensed without chemical change to the substance.
7. Ability to neutralize a base is a chemical property as it involves a chemical reaction.
8. Luster is a physical property as it can be observed without chemical change.
9. Ability to react with water is a chemical property as it involves a chemical reaction.
10. Combustibility is a chemical property as it involves burning, a chemical change.
11. Milk souring is a chemical change as new substances are formed through fermentation.
12. Sodium chloride dissolving in water is a physical change as no new substances are formed.
13. Water heating and changing into steam is a physical change as it is a state - change.
14. Iron rusting is a chemical change as iron reacts with oxygen to form iron oxide.
15. Wood rotting is a chemical change as it involves decomposition by microorganisms.
16. Sugar added to sweet tea is a physical change as no new substances are formed.
17. A bike tire being inflated with air is a physical change as no chemical reaction occurs.
18. Window glass shattering is a physical change as it is a physical breakage with no chemical change.
19. A paper towel absorbing spilled water is a physical change as it is a physical absorption.
20. Mowing the lawn is a physical change as it is a physical cutting with no chemical change.

Answer:

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