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 that it 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 typical in chemical reactions (e.g., rusting iron).
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4. Fizzing or foaming is evidence that a chemical change may have occurred.
✔ True
*Explanation:* Fizzing usually means gas is being produced, which suggests 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 fireworks or burning) usually involves energy release from a chemical reaction.
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6. Production of heat or light is evidence that a chemical change may have occurred.
✔ True
*Explanation:* Heat and light are common indicators of exothermic chemical reactions.
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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 (like rotten eggs or burnt food) often signals new substances forming via chemical change.
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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 bonds; reversing them typically requires another chemical process (not just physical methods like filtering or melting).
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Now classify each event:
1. You cut your hair. → P
*Explanation:* Only the size/shape changes; no new substances form.
2. Making a peanut, pretzel and cereal mixture. → P
*Explanation:* It’s a physical mixture—no chemical reaction occurs.
3. Baking soda reacts with vinegar and forms a gas. → C
*Explanation:* Gas production (CO₂) indicates 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 copper oxidizing (forming patina), a chemical change.
7. Two clear liquids are mixed and a yellow color forms. → C
*Explanation:* Color change implies a new substance formed—likely a chemical reaction.
8. Baking cookies. → C
*Explanation:* Cooking involves chemical changes (e.g., proteins denaturing, browning reactions).
9. Diamonds are used to scratch glass. → P
*Explanation:* This is a physical interaction based on hardness, not a chemical change.
10. A tree burns to form ashes. → C
*Explanation:* Combustion produces new substances (ash, CO₂, water vapor)—definitely a chemical change.
11. A piece of paper is crumpled up. → P
*Explanation:* Only shape changes; no new substances.
12. Water freezes to form ice. → P
*Explanation:* State change (liquid → solid); no chemical change.
13. Food spoiling. → C
*Explanation:* Microbial action causes decomposition—new substances form.
14. A candle burning. → C
*Explanation:* Combustion of wax produces CO₂, water vapor, and light/heat—chemical change.
15. A candle melting. → P
*Explanation:* Wax changes from solid to liquid due to heat—but no new substances form.
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#### True or False Corrections:
1. True
2. Change "physical" to "chemical"
3. True
4. True
5. Change "physical" to "chemical"
6. True
7. Change "physical" to "chemical"
8. Change "can be reversed" to "cannot be reversed"
#### Identify 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 for printing or want a version with explanations included!
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Part 1: True or False
Instructions: If false, correct the *underlined* portion so that it is true.
---
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.
---
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 typical in chemical reactions (e.g., rusting iron).
---
4. Fizzing or foaming is evidence that a chemical change may have occurred.
✔ True
*Explanation:* Fizzing usually means gas is being produced, which suggests 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 fireworks or burning) usually involves energy release from a chemical reaction.
---
6. Production of heat or light is evidence that a chemical change may have occurred.
✔ True
*Explanation:* Heat and light are common indicators of exothermic chemical reactions.
---
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 (like rotten eggs or burnt food) often signals new substances forming via chemical change.
---
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 bonds; reversing them typically requires another chemical process (not just physical methods like filtering or melting).
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Part 2: Identify as Physical (P) or Chemical (C)
Now classify each event:
1. You cut your hair. → P
*Explanation:* Only the size/shape changes; no new substances form.
2. Making a peanut, pretzel and cereal mixture. → P
*Explanation:* It’s a physical mixture—no chemical reaction occurs.
3. Baking soda reacts with vinegar and forms a gas. → C
*Explanation:* Gas production (CO₂) indicates 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 copper oxidizing (forming patina), a chemical change.
7. Two clear liquids are mixed and a yellow color forms. → C
*Explanation:* Color change implies a new substance formed—likely a chemical reaction.
8. Baking cookies. → C
*Explanation:* Cooking involves chemical changes (e.g., proteins denaturing, browning reactions).
9. Diamonds are used to scratch glass. → P
*Explanation:* This is a physical interaction based on hardness, not a chemical change.
10. A tree burns to form ashes. → C
*Explanation:* Combustion produces new substances (ash, CO₂, water vapor)—definitely a chemical change.
11. A piece of paper is crumpled up. → P
*Explanation:* Only shape changes; no new substances.
12. Water freezes to form ice. → P
*Explanation:* State change (liquid → solid); no chemical change.
13. Food spoiling. → C
*Explanation:* Microbial action causes decomposition—new substances form.
14. A candle burning. → C
*Explanation:* Combustion of wax produces CO₂, water vapor, and light/heat—chemical change.
15. A candle melting. → P
*Explanation:* Wax changes from solid to liquid due to heat—but no new substances form.
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✔ Final Answers Summary
#### True or False Corrections:
1. True
2. Change "physical" to "chemical"
3. True
4. True
5. Change "physical" to "chemical"
6. True
7. Change "physical" to "chemical"
8. Change "can be reversed" to "cannot be reversed"
#### Identify 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 for printing or want a version with explanations included!
Parent Tip: Review the logic above to help your child master the concept of physical vs chemical changes worksheet answers.
