Free Printable Physical and Chemical Properties and Changes Worksheets - Free Printable
Educational worksheet: Free Printable Physical and Chemical Properties and Changes Worksheets. Download and print for classroom or home learning activities.
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Step-by-step solution for: Free Printable Physical and Chemical Properties and Changes Worksheets
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Show Answer Key & Explanations
Step-by-step solution for: Free Printable Physical and Chemical Properties and Changes Worksheets
To solve this worksheet, we need to determine whether each of the listed occurrences represents a physical change (P) or a chemical change (C). Here's a breakdown of each item:
- A physical change involves a change in the form or appearance of a substance without altering its chemical composition. Examples include changes in state (solid to liquid, liquid to gas), shape, size, or arrangement of particles.
- A chemical change involves the formation of new substances with different chemical properties. This often results in the breaking and forming of chemical bonds, leading to new molecules.
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1. Crushing a rock
- P: The rock is broken into smaller pieces, but its chemical composition remains unchanged.
2. Digesting food
- C: Digestion involves breaking down complex molecules into simpler ones through chemical reactions in the body.
3. Water evaporating
- P: Water changes from liquid to gas (evaporation), but it remains H₂O.
4. Fireworks exploding
- C: Fireworks involve combustion, which is a chemical reaction producing light, heat, and sound.
5. Getting a haircut
- P: Cutting hair does not change the chemical composition of the hair; it only alters its length.
6. An ice cube melting
- P: Melting is a phase change from solid to liquid, but the chemical composition of water (H₂O) remains the same.
7. A candle burning
- C: Burning a candle involves combustion, where wax reacts with oxygen to produce carbon dioxide and water.
8. Salt dissolving in water
- P: Salt dissolves in water, forming a solution, but no new substances are created.
9. Silver tarnishing
- C: Tarnishing occurs when silver reacts with sulfur compounds in the air, forming a new compound (silver sulfide).
10. Glass breaking
- P: Breaking glass changes its shape but does not alter its chemical composition.
11. Hair bleaching
- C: Bleaching involves chemical reactions that break down the pigment molecules in hair, changing its color.
12. A bicycle rusting
- C: Rusting is a chemical reaction where iron reacts with oxygen and water to form iron oxide (rust).
13. Frying an egg
- C: Frying an egg causes proteins in the egg to denature and coagulate, forming new structures.
14. Baking soda reacting with vinegar
- C: Baking soda (sodium bicarbonate) reacts with vinegar (acetic acid) to produce carbon dioxide gas, water, and sodium acetate.
15. Oil mixing with water
- P: Mixing oil and water does not create new substances; it simply combines them physically.
16. Cutting grass
- P: Cutting grass changes its shape but does not alter its chemical composition.
17. Butter melting
- P: Melting butter is a phase change from solid to liquid, but the chemical composition remains the same.
18. Ethanol evaporating
- P: Evaporation of ethanol is a phase change from liquid to gas, but the chemical composition remains unchanged.
19. Grass growing
- C: Grass growth involves photosynthesis, a chemical process where plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.
20. A tire inflating
- P: Inflating a tire involves compressing air into the tire, which is a physical change in pressure and volume.
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```
1. P
2. C
3. P
4. C
5. P
6. P
7. C
8. P
9. C
10. P
11. C
12. C
13. C
14. C
15. P
16. P
17. P
18. P
19. C
20. P
```
Physical Change (P)
- A physical change involves a change in the form or appearance of a substance without altering its chemical composition. Examples include changes in state (solid to liquid, liquid to gas), shape, size, or arrangement of particles.
Chemical Change (C)
- A chemical change involves the formation of new substances with different chemical properties. This often results in the breaking and forming of chemical bonds, leading to new molecules.
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Solution:
1. Crushing a rock
- P: The rock is broken into smaller pieces, but its chemical composition remains unchanged.
2. Digesting food
- C: Digestion involves breaking down complex molecules into simpler ones through chemical reactions in the body.
3. Water evaporating
- P: Water changes from liquid to gas (evaporation), but it remains H₂O.
4. Fireworks exploding
- C: Fireworks involve combustion, which is a chemical reaction producing light, heat, and sound.
5. Getting a haircut
- P: Cutting hair does not change the chemical composition of the hair; it only alters its length.
6. An ice cube melting
- P: Melting is a phase change from solid to liquid, but the chemical composition of water (H₂O) remains the same.
7. A candle burning
- C: Burning a candle involves combustion, where wax reacts with oxygen to produce carbon dioxide and water.
8. Salt dissolving in water
- P: Salt dissolves in water, forming a solution, but no new substances are created.
9. Silver tarnishing
- C: Tarnishing occurs when silver reacts with sulfur compounds in the air, forming a new compound (silver sulfide).
10. Glass breaking
- P: Breaking glass changes its shape but does not alter its chemical composition.
11. Hair bleaching
- C: Bleaching involves chemical reactions that break down the pigment molecules in hair, changing its color.
12. A bicycle rusting
- C: Rusting is a chemical reaction where iron reacts with oxygen and water to form iron oxide (rust).
13. Frying an egg
- C: Frying an egg causes proteins in the egg to denature and coagulate, forming new structures.
14. Baking soda reacting with vinegar
- C: Baking soda (sodium bicarbonate) reacts with vinegar (acetic acid) to produce carbon dioxide gas, water, and sodium acetate.
15. Oil mixing with water
- P: Mixing oil and water does not create new substances; it simply combines them physically.
16. Cutting grass
- P: Cutting grass changes its shape but does not alter its chemical composition.
17. Butter melting
- P: Melting butter is a phase change from solid to liquid, but the chemical composition remains the same.
18. Ethanol evaporating
- P: Evaporation of ethanol is a phase change from liquid to gas, but the chemical composition remains unchanged.
19. Grass growing
- C: Grass growth involves photosynthesis, a chemical process where plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.
20. A tire inflating
- P: Inflating a tire involves compressing air into the tire, which is a physical change in pressure and volume.
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Final Answer:
```
1. P
2. C
3. P
4. C
5. P
6. P
7. C
8. P
9. C
10. P
11. C
12. C
13. C
14. C
15. P
16. P
17. P
18. P
19. C
20. P
```
Parent Tip: Review the logic above to help your child master the concept of chemical and physical changes worksheet.
