Question

physical and chemical properties and changes
name keyjaziyah phillips
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.

physical and chemical changes
part a
can you recognize the chemical and physical changes that happen all around us? if you change the way something looks, but haven’t made a new substance, a physical change (p) has occurred. if the substance has been changes into another substance, a chemical change (c) has occurred.

1. an ice cube is placed in the sun. later there is a puddle of water. later still the puddle is gone.
2. two chemical are mixed together and a gas is produce.
3. a bicycle changes color as it rusts.
4. a solid is crushed to a powder.
5. two substances are mixed and light is produced.
6. a piece of ice melts and reacts with sodium.
7. mixing salt and pepper.
8. chocolate syrup is dissolved in milk.
9. a marshmallow is toasted over a campfire.
10. a marshmallow is cut in half.

Explanation:

Step1: Recall physical and chemical property definitions

Physical properties are observed with senses or determined without destroying matter. Chemical properties involve reactions that change matter into new substances.

Step2: Classify properties

1. Blue color is observed with senses, so it's a physical property (P).
2. Density is determined without destroying matter, so it's a physical property (P).
3. Flammability involves a reaction (burning), so it's a chemical property (C).
4. Solubility is a physical property as it doesn't change the substance chemically (P).
5. Reacting with acid is a chemical property (C).
6. Supporting combustion is a chemical property (C).
7. Sour taste is a physical property as it's observed without a chemical - change (P).
8. Melting point is a physical property (P).
9. Reacting with water is a chemical property (C).
10. Hardness is a physical property (P).
11. Boiling point is a physical property (P).
12. Luster is a physical property (P).
13. Odor is a physical property (P).
14. Reacting with air is a chemical property (C).

Step3: Recall physical and chemical change definitions

Physical changes are in size, shape, or state with no new substance formed. Chemical changes form new substances.

Step4: Classify changes

1. NaCl dissolving in water is a physical change (P) as no new substance is formed.
2. Silver tarnishing is a chemical change (C) as a new substance (silver sulfide) is formed.
3. Cutting an apple is a physical change (P) as it's just a change in shape.
4. Water turning to steam is a physical change (P) as it's a change in state.
5. Baking soda reacting with vinegar is a chemical change (C) as new substances (carbon dioxide, etc.) are formed.
6. Iron rusting is a chemical change (C) as iron oxide is formed.
7. Alcohol evaporating is a physical change (P) as it's a change in state.
8. Ice melting is a physical change (P) as it's a change in state.
9. Milk souring is a chemical change (C) as new substances are formed.
10. Sugar dissolving in water is a physical change (P) as no new substance is formed.
11. Wood rotting is a chemical change (C) as new substances are formed.
12. Pancakes cooking is a chemical change (C) as new substances are formed due to heat - induced reactions.
13. Grass growing is a chemical change (C) as new organic compounds are formed.
14. Inflating a tire is a physical change (P) as it's a change in size.
15. Food digestion is a chemical change (C) as new substances are formed.
16. Paper towel absorbing water is a physical change (P) as no new substance is formed.

Step5: Classify Part A changes

1. Ice cube melting and evaporating is a physical change (P).
2. Two chemicals mixing to produce a gas is a chemical change (C).
3. Bicycle rusting is a chemical change (C).
4. Solid crushed to powder is a physical change (P).
5. Two substances mixing to produce light is a chemical change (C).
6. Ice melting is a physical change (P), reacting with sodium is a chemical change (C).
7. Mixing salt and pepper is a physical change (P).
8. Chocolate syrup dissolving in milk is a physical change (P).
9. Toasting a marshmallow is a chemical change (C).
10. Cutting a marshmallow in half is a physical change (P).

Answer:

Properties:

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

Changes:

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

Part A:

1. P
2. C
3. C
4. P
5. C
6. P, C
7. P
8. P
9. C
10. P