Question

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 vinegar.
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 havent 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 and determined without destroying matter. Chemical properties indicate how a substance reacts with something else and matter is changed into a new substance after the reaction.

Step2: Analyze each property in the first part

• Blue color, density, solubility, melting point, hardness, boiling point, luster, odor are physical properties (P) as they fit the physical - property criteria. Flammability, reacts with water, reacts with acid, supports combustion, reacts with air are chemical properties (C) as they involve reactions and formation of new substances.

Step3: Recall physical and chemical change definitions

Physical change is a change in size, shape, or state with no new substance formed. Chemical change is a change in physical and chemical properties with a new substance formed.

Step4: Analyze each change in the second and third parts

• Dissolving salt in water, cutting an apple, alcohol evaporating, ice melting, inflating a tire, paper towel absorbing water, dissolving chocolate syrup in milk, cutting a marshmallow in half are physical changes (P). Tarnishing of silver, heating water to steam, baking soda reacting with vinegar, iron rusting, milk souring, wood rotting, pancakes cooking, grass growing, food being digested, toasting a marshmallow over a campfire are chemical changes (C) as new substances are formed in these processes.

Answer:

The answers in the image are correct as per the definitions of physical and chemical properties and changes. For the first part:

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

For the second part:

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

For the third part:

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