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 the explanation and classification for each:
- Definition: A physical change involves a change in the form or appearance of a substance without altering its chemical composition. No new substances are formed.
- Definition: A chemical change involves a transformation where one or more new substances are formed with different chemical properties. The original substances are altered at the molecular level.
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1. Crushing a rock
- Explanation: Crushing a rock changes its shape but does not alter its chemical composition.
- Answer: P
2. Digesting food
- Explanation: Digestion involves breaking down complex molecules into simpler ones through chemical reactions, forming new substances.
- Answer: C
3. Water evaporating
- Explanation: Evaporation is a phase change from liquid to gas, which is a physical process as no new substances are formed.
- Answer: P
4. Fireworks exploding
- Explanation: Fireworks involve combustion, which is a chemical reaction producing light, heat, and new substances.
- Answer: C
5. Getting a haircut
- Explanation: Cutting hair only changes its length; no chemical alteration occurs.
- Answer: P
6. An ice cube melting
- Explanation: Melting is a phase change from solid to liquid, which is a physical process.
- Answer: P
7. A candle burning
- Explanation: Burning a candle involves combustion, a chemical reaction that produces carbon dioxide, water, and other products.
- Answer: C
8. Salt dissolving in water
- Explanation: Dissolving salt in water separates the sodium and chloride ions but does not create new substances.
- Answer: P
9. Silver tarnishing
- Explanation: Tarnishing is a chemical reaction where silver reacts with sulfur compounds in the air to form a layer of silver sulfide.
- Answer: C
10. Glass breaking
- Explanation: Breaking glass only changes its shape; no chemical alteration occurs.
- Answer: P
11. Hair bleaching
- Explanation: Bleaching hair involves chemical reactions that alter the pigment molecules, resulting in new substances.
- Answer: C
12. A bicycle rusting
- Explanation: Rusting is a chemical reaction where iron reacts with oxygen and water to form iron oxide (rust).
- Answer: C
13. Frying an egg
- Explanation: Frying an egg involves denaturing proteins through heat, which is a chemical change as new substances are formed.
- Answer: C
14. Baking soda reacting with vinegar
- Explanation: This reaction produces carbon dioxide gas, water, and sodium acetate, indicating a chemical change.
- Answer: C
15. Oil mixing with water
- Explanation: Mixing oil and water does not produce new substances; it is a physical mixture.
- Answer: P
16. Cutting grass
- Explanation: Cutting grass only changes its size; no chemical alteration occurs.
- Answer: P
17. Butter melting
- Explanation: Melting butter is a phase change from solid to liquid, which is a physical process.
- Answer: P
18. Ethanol evaporating
- Explanation: Evaporation of ethanol is a phase change from liquid to gas, which is a physical process.
- Answer: P
19. Grass growing
- Explanation: Grass growth involves photosynthesis, a chemical process where plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.
- Answer: C
20. A tire inflating
- Explanation: Inflating a tire involves compressing air into the tire, which is a physical change as no new substances are formed.
- Answer: P
---
```
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)
- Definition: A physical change involves a change in the form or appearance of a substance without altering its chemical composition. No new substances are formed.
Chemical Change (C)
- Definition: A chemical change involves a transformation where one or more new substances are formed with different chemical properties. The original substances are altered at the molecular level.
---
Solution:
1. Crushing a rock
- Explanation: Crushing a rock changes its shape but does not alter its chemical composition.
- Answer: P
2. Digesting food
- Explanation: Digestion involves breaking down complex molecules into simpler ones through chemical reactions, forming new substances.
- Answer: C
3. Water evaporating
- Explanation: Evaporation is a phase change from liquid to gas, which is a physical process as no new substances are formed.
- Answer: P
4. Fireworks exploding
- Explanation: Fireworks involve combustion, which is a chemical reaction producing light, heat, and new substances.
- Answer: C
5. Getting a haircut
- Explanation: Cutting hair only changes its length; no chemical alteration occurs.
- Answer: P
6. An ice cube melting
- Explanation: Melting is a phase change from solid to liquid, which is a physical process.
- Answer: P
7. A candle burning
- Explanation: Burning a candle involves combustion, a chemical reaction that produces carbon dioxide, water, and other products.
- Answer: C
8. Salt dissolving in water
- Explanation: Dissolving salt in water separates the sodium and chloride ions but does not create new substances.
- Answer: P
9. Silver tarnishing
- Explanation: Tarnishing is a chemical reaction where silver reacts with sulfur compounds in the air to form a layer of silver sulfide.
- Answer: C
10. Glass breaking
- Explanation: Breaking glass only changes its shape; no chemical alteration occurs.
- Answer: P
11. Hair bleaching
- Explanation: Bleaching hair involves chemical reactions that alter the pigment molecules, resulting in new substances.
- Answer: C
12. A bicycle rusting
- Explanation: Rusting is a chemical reaction where iron reacts with oxygen and water to form iron oxide (rust).
- Answer: C
13. Frying an egg
- Explanation: Frying an egg involves denaturing proteins through heat, which is a chemical change as new substances are formed.
- Answer: C
14. Baking soda reacting with vinegar
- Explanation: This reaction produces carbon dioxide gas, water, and sodium acetate, indicating a chemical change.
- Answer: C
15. Oil mixing with water
- Explanation: Mixing oil and water does not produce new substances; it is a physical mixture.
- Answer: P
16. Cutting grass
- Explanation: Cutting grass only changes its size; no chemical alteration occurs.
- Answer: P
17. Butter melting
- Explanation: Melting butter is a phase change from solid to liquid, which is a physical process.
- Answer: P
18. Ethanol evaporating
- Explanation: Evaporation of ethanol is a phase change from liquid to gas, which is a physical process.
- Answer: P
19. Grass growing
- Explanation: Grass growth involves photosynthesis, a chemical process where plants use sunlight, water, and carbon dioxide to produce glucose and oxygen.
- Answer: C
20. A tire inflating
- Explanation: Inflating a tire involves compressing air into the tire, which is a physical change as no new substances are formed.
- Answer: P
---
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 physical change vs chemical change worksheet.
