Educational worksheet on physical and chemical changes featuring illustrated examples and multiple-choice questions.
A worksheet titled "Physical and Chemical Changes" with nine questions, each accompanied by an illustration such as sour milk, an hourglass, rain, a birthday cake, fire, melting butter, an ice cream cone, a match, and charcoal on a grill.
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Show Answer Key & Explanations
Step-by-step solution for: Engaging Science Worksheets for Kids
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Show Answer Key & Explanations
Step-by-step solution for: Engaging Science Worksheets for Kids
Let's go through each question in the worksheet and solve it step by step, explaining why the correct answer is what it is.
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a. physical change
b. chemical change
✔ Answer: b. chemical change
Explanation: When milk sours, bacteria break down lactose into lactic acid, creating new substances (like acids) that give off a bad smell. Since new substances are formed, this is a chemical change.
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a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: The sand is just moving from one chamber to another. No new substances are formed; only the position of the sand changes. This is a physical change.
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a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: Changing from gas to liquid (condensation) involves a change in state, but not in the substance’s chemical identity. For example, water vapor turning into liquid water is still H₂O. So it's a physical change.
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The image shows:
- A birthday cake with candles (burning)
- Fire (combustion)
- A drill (making holes)
- Bread being baked
✔ Answer: drilling a hole in wood (the drill)
Explanation: Drilling a hole in wood changes its shape, but no new substances are formed. It's a physical change.
Burning candles, fire, and baking bread involve chemical reactions (new substances form), so they are chemical changes.
So the correct answer is: drilling a hole in wood.
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a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: Melting butter changes its state from solid to liquid, but it's still butter. No new substances are formed. This is a physical change.
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a. closing the door
b. cracking an egg
c. turning off the electric light
d. putting the milk back in the fridge
✔ Answer: a. closing the door
Explanation:
- Closing the door: Only position changes → physical change
- Cracking an egg: The shell breaks, and contents may spill — though no new substances, it can be seen as a physical change, but cracking an egg can lead to chemical changes if exposed to air or cooking.
- Turning off the light: Electrical change, but no matter change → not a physical change in substance
- Putting milk back in fridge: Doesn’t change the milk’s nature unless it's already spoiled
But closing the door is clearly a physical change without altering the material.
✔ Best answer: a. closing the door
(Note: Some might argue "cracking an egg" is also physical, but since it's a multiple-choice and we must pick the best, a is safest.)
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a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: Melting is a change in state (solid to liquid). The composition of the ice cream doesn't change — it's still ice cream. So it's a physical change.
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a. water freezing
b. match burning
c. dew on grass
d. magnetizing a nail
✔ Answer: b. match burning
Explanation:
- Water freezing: Change of state → physical
- Match burning: Combustion produces ash, gases, heat, light → chemical change
- Dew on grass: Condensation → physical
- Magnetizing a nail: Physical property change (magnetic field), no new substances → physical
So, match burning is a chemical change.
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a. physical change
b. chemical change
✔ Answer: b. chemical change
Explanation: Burning (combustion) of charcoal produces carbon dioxide, ash, heat, and light. New substances are formed → chemical change.
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| Question | Answer |
|--------|--------|
| 1 | b. chemical change |
| 2 | b. physical change |
| 3 | b. physical change |
| 4 | drilling a hole in wood (or the drill image) |
| 5 | b. physical change |
| 6 | a. closing the door |
| 7 | b. physical change |
| 8 | b. match burning |
| 9 | b. chemical change |
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Let me know if you'd like this formatted as a printable answer key!
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1. Soured milk smells badly because bacteria have formed new substances in the milk. This is an example of ___
a. physical change
b. chemical change
✔ Answer: b. chemical change
Explanation: When milk sours, bacteria break down lactose into lactic acid, creating new substances (like acids) that give off a bad smell. Since new substances are formed, this is a chemical change.
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2. Sand flowing in an hourglass is an example of _____.
a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: The sand is just moving from one chamber to another. No new substances are formed; only the position of the sand changes. This is a physical change.
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3. The change of state from a gas to a liquid is an example of _____.
a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: Changing from gas to liquid (condensation) involves a change in state, but not in the substance’s chemical identity. For example, water vapor turning into liquid water is still H₂O. So it's a physical change.
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4. Which is an example of a physical change?
The image shows:
- A birthday cake with candles (burning)
- Fire (combustion)
- A drill (making holes)
- Bread being baked
✔ Answer: drilling a hole in wood (the drill)
Explanation: Drilling a hole in wood changes its shape, but no new substances are formed. It's a physical change.
Burning candles, fire, and baking bread involve chemical reactions (new substances form), so they are chemical changes.
So the correct answer is: drilling a hole in wood.
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5. The melting of butter when it is let out in a warm room is an example of _____.
a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: Melting butter changes its state from solid to liquid, but it's still butter. No new substances are formed. This is a physical change.
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6. Which of the following is an example of a physical change?
a. closing the door
b. cracking an egg
c. turning off the electric light
d. putting the milk back in the fridge
✔ Answer: a. closing the door
Explanation:
- Closing the door: Only position changes → physical change
- Cracking an egg: The shell breaks, and contents may spill — though no new substances, it can be seen as a physical change, but cracking an egg can lead to chemical changes if exposed to air or cooking.
- Turning off the light: Electrical change, but no matter change → not a physical change in substance
- Putting milk back in fridge: Doesn’t change the milk’s nature unless it's already spoiled
But closing the door is clearly a physical change without altering the material.
✔ Best answer: a. closing the door
(Note: Some might argue "cracking an egg" is also physical, but since it's a multiple-choice and we must pick the best, a is safest.)
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7. An ice cream cone melting on a hot day is an example of _____.
a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: Melting is a change in state (solid to liquid). The composition of the ice cream doesn't change — it's still ice cream. So it's a physical change.
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8. Which of the following describes a chemical change?
a. water freezing
b. match burning
c. dew on grass
d. magnetizing a nail
✔ Answer: b. match burning
Explanation:
- Water freezing: Change of state → physical
- Match burning: Combustion produces ash, gases, heat, light → chemical change
- Dew on grass: Condensation → physical
- Magnetizing a nail: Physical property change (magnetic field), no new substances → physical
So, match burning is a chemical change.
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9. Charcoal burning on the grill is an example of _____.
a. physical change
b. chemical change
✔ Answer: b. chemical change
Explanation: Burning (combustion) of charcoal produces carbon dioxide, ash, heat, and light. New substances are formed → chemical change.
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✔ Final Answers Summary:
| Question | Answer |
|--------|--------|
| 1 | b. chemical change |
| 2 | b. physical change |
| 3 | b. physical change |
| 4 | drilling a hole in wood (or the drill image) |
| 5 | b. physical change |
| 6 | a. closing the door |
| 7 | b. physical change |
| 8 | b. match burning |
| 9 | b. chemical change |
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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 or chemical change worksheet.
