Physical and chemical changes worksheet with answers: Fill out ... - Free Printable
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Step-by-step solution for: Physical and chemical changes worksheet with answers: Fill out ...
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Show Answer Key & Explanations
Step-by-step solution for: Physical and chemical changes worksheet with answers: Fill out ...
Let's go through the Physical and Chemical Change Worksheet step by step, solving each part with explanations.
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Instructions: If false, correct the *underlined* portion so the statement is true.
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1. A physical change is a change of matter from one form to another without a change in chemical properties.
✔ True
*Explanation:* A physical change alters the form (e.g., shape, state) but not the chemical identity of the substance.
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2. A physical change is a change that occurs when a substance changes composition by forming one or more new substances.
✘ False
→ Corrected: A chemical change is a change that occurs when a substance changes composition by forming one or more new substances.
*Explanation:* This definition describes a chemical change, not a physical one.
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3. Color change is evidence that a chemical change may have occurred.
✔ True
*Explanation:* A color change often indicates a new substance has formed, which is a sign of a chemical change (e.g., rusting iron turns reddish-brown).
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4. Fizzling or foaming is evidence that a chemical change may have occurred.
✔ True
*Explanation:* Fizzing or foaming usually means gas is being produced — a common indicator of a chemical reaction (e.g., baking soda + vinegar).
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5. Production of light is evidence that a physical change may have occurred.
✘ False
→ Corrected: Production of light is evidence that a chemical change may have occurred.
*Explanation:* Light production (like in fire or glow sticks) typically results from energy released during a chemical reaction.
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6. Production of heat or light is evidence that a chemical change may have occurred.
✔ True
*Explanation:* Energy changes (heat or light) are signs that a chemical reaction has taken place.
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7. A change in odor is evidence that a physical change may have occurred.
✘ False
→ Corrected: A change in odor is evidence that a chemical change may have occurred.
*Explanation:* A new smell often means new substances are formed (e.g., spoiled food smells bad due to decomposition).
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8. Chemical changes can be reversed by physical changes.
✘ False
→ Corrected: Chemical changes cannot be reversed by physical changes.
*Explanation:* Chemical changes involve breaking and forming chemical bonds; reversing them usually requires another chemical reaction, not just physical means.
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Now, classify each process:
1. You cut your hair. → P
*Explanation:* Only the size and shape change; no new substance forms.
2. Making a peanut, pretzel and cereal mixture. → P
*Explanation:* It’s a physical mixing of ingredients; no chemical reaction.
3. Baking soda reacts with vinegar and forms a gas. → C
*Explanation:* Gas production (CO₂) is a sign of a chemical reaction.
4. A piece of metal is bent in half. → P
*Explanation:* Shape changes, but the metal remains chemically the same.
5. An aspirin is crushed into fine powder. → P
*Explanation:* Size changes, but no new substances form.
6. Copper turns green when exposed to the environment. → C
*Explanation:* This is tarnishing (formation of copper carbonate), a chemical change.
7. Two clear liquids are mixed and a yellow color forms. → C
*Explanation:* Color change suggests a new substance formed via chemical reaction.
8. Baking cookies. → C
*Explanation:* Cooking involves chemical reactions (e.g., browning, setting of proteins).
9. Diamonds are used to scratch glass. → P
*Explanation:* This is a physical interaction based on hardness; no chemical change.
10. A tree burns to form ashes. → C
*Explanation:* Burning (combustion) is a chemical reaction producing ash, CO₂, water vapor, etc.
11. A piece of paper is crumpled up. → P
*Explanation:* Only shape changes; no new substances.
12. Water freezes to form ice. → P
*Explanation:* Phase change (liquid → solid); no chemical change.
13. Food spoiling. → C
*Explanation:* Microbial action causes chemical breakdown of food.
14. A candle burning. → C
*Explanation:* Combustion produces CO₂, water vapor, and light/heat — a chemical change.
15. A candle melting. → P
*Explanation:* The wax changes from solid to liquid, but it's still wax (no new substance).
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#### True or False (Corrected if needed):
1. True
2. A chemical change
3. True
4. True
5. A chemical change
6. True
7. A chemical change
8. cannot be reversed by physical changes
#### Identify as P or C:
1. P
2. P
3. C
4. P
5. P
6. C
7. C
8. C
9. P
10. C
11. P
12. P
13. C
14. C
15. P
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Let me know if you'd like this formatted as a printable answer key!
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Part 1: True or False
Instructions: If false, correct the *underlined* portion so the statement is true.
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1. A physical change is a change of matter from one form to another without a change in chemical properties.
✔ True
*Explanation:* A physical change alters the form (e.g., shape, state) but not the chemical identity of the substance.
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2. A physical change is a change that occurs when a substance changes composition by forming one or more new substances.
✘ False
→ Corrected: A chemical change is a change that occurs when a substance changes composition by forming one or more new substances.
*Explanation:* This definition describes a chemical change, not a physical one.
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3. Color change is evidence that a chemical change may have occurred.
✔ True
*Explanation:* A color change often indicates a new substance has formed, which is a sign of a chemical change (e.g., rusting iron turns reddish-brown).
---
4. Fizzling or foaming is evidence that a chemical change may have occurred.
✔ True
*Explanation:* Fizzing or foaming usually means gas is being produced — a common indicator of a chemical reaction (e.g., baking soda + vinegar).
---
5. Production of light is evidence that a physical change may have occurred.
✘ False
→ Corrected: Production of light is evidence that a chemical change may have occurred.
*Explanation:* Light production (like in fire or glow sticks) typically results from energy released during a chemical reaction.
---
6. Production of heat or light is evidence that a chemical change may have occurred.
✔ True
*Explanation:* Energy changes (heat or light) are signs that a chemical reaction has taken place.
---
7. A change in odor is evidence that a physical change may have occurred.
✘ False
→ Corrected: A change in odor is evidence that a chemical change may have occurred.
*Explanation:* A new smell often means new substances are formed (e.g., spoiled food smells bad due to decomposition).
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8. Chemical changes can be reversed by physical changes.
✘ False
→ Corrected: Chemical changes cannot be reversed by physical changes.
*Explanation:* Chemical changes involve breaking and forming chemical bonds; reversing them usually requires another chemical reaction, not just physical means.
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Part 2: Identify as Physical (P) or Chemical (C)
Now, classify each process:
1. You cut your hair. → P
*Explanation:* Only the size and shape change; no new substance forms.
2. Making a peanut, pretzel and cereal mixture. → P
*Explanation:* It’s a physical mixing of ingredients; no chemical reaction.
3. Baking soda reacts with vinegar and forms a gas. → C
*Explanation:* Gas production (CO₂) is a sign of a chemical reaction.
4. A piece of metal is bent in half. → P
*Explanation:* Shape changes, but the metal remains chemically the same.
5. An aspirin is crushed into fine powder. → P
*Explanation:* Size changes, but no new substances form.
6. Copper turns green when exposed to the environment. → C
*Explanation:* This is tarnishing (formation of copper carbonate), a chemical change.
7. Two clear liquids are mixed and a yellow color forms. → C
*Explanation:* Color change suggests a new substance formed via chemical reaction.
8. Baking cookies. → C
*Explanation:* Cooking involves chemical reactions (e.g., browning, setting of proteins).
9. Diamonds are used to scratch glass. → P
*Explanation:* This is a physical interaction based on hardness; no chemical change.
10. A tree burns to form ashes. → C
*Explanation:* Burning (combustion) is a chemical reaction producing ash, CO₂, water vapor, etc.
11. A piece of paper is crumpled up. → P
*Explanation:* Only shape changes; no new substances.
12. Water freezes to form ice. → P
*Explanation:* Phase change (liquid → solid); no chemical change.
13. Food spoiling. → C
*Explanation:* Microbial action causes chemical breakdown of food.
14. A candle burning. → C
*Explanation:* Combustion produces CO₂, water vapor, and light/heat — a chemical change.
15. A candle melting. → P
*Explanation:* The wax changes from solid to liquid, but it's still wax (no new substance).
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✔ Final Answers:
#### True or False (Corrected if needed):
1. True
2. A chemical change
3. True
4. True
5. A chemical change
6. True
7. A chemical change
8. cannot be reversed by physical changes
#### Identify as P or C:
1. P
2. P
3. C
4. P
5. P
6. C
7. C
8. C
9. P
10. C
11. P
12. P
13. C
14. C
15. P
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Let me know if you'd like this formatted as a printable answer key!
Parent Tip: Review the logic above to help your child master the concept of physical vs chemical change worksheet answers.
