Free Science Worksheets for Kids Fun - Free Printable
Educational worksheet: Free Science Worksheets for Kids Fun. Download and print for classroom or home learning activities.
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Show Answer Key & Explanations
Step-by-step solution for: Free Science Worksheets for Kids Fun
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Show Answer Key & Explanations
Step-by-step solution for: Free Science Worksheets for Kids Fun
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. So, it’s a physical change.
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a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: Changing from gas to liquid (condensation) is a change in physical state. The substance remains the same chemically — no new substances form. This is a physical change.
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(Images shown: birthday cake with candles, campfire, drill, bread being baked)
✔ Answer: drilling a hole in wood (represented by the drill image)
Explanation: Drilling a hole changes the shape of the wood but does not create new substances. It’s a physical change.
Other options:
- Candles burning → chemical change (combustion)
- Campfire → chemical change (burning)
- Bread baking → chemical change (cooking causes chemical reactions)
So, the drill represents a physical change.
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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:
- a. Closing the door: Only position changes → physical change
- b. Cracking an egg: The shell breaks, and contents spill — but the egg itself may begin to spoil or react (but technically, cracking is a physical change). However, cracking an egg can lead to chemical changes if exposed to air, so it's borderline.
- c. Turning off the light: Electrical process, but no matter change → more of an energy change
- d. Putting milk back in fridge: Temperature change, but no new substances → physical, but not a true change unless it affects the milk
But among these, closing the door is clearly a physical change with no transformation of matter.
👉 Best answer: a. closing the door
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a. chemical change
b. physical change
✔ Answer: b. physical change
Explanation: Ice cream melts from solid to liquid due to heat, but its composition stays the same. No new substances are formed. 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:
- a. Water freezing → physical change (state change)
- b. Match burning → combustion → produces ash, gases, heat → chemical change
- c. Dew on grass → condensation → physical change
- d. Magnetizing a nail → temporary physical property change → physical change
So, match burning is the only chemical change.
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a. physical change
b. chemical change
✔ Answer: b. chemical change
Explanation: Burning charcoal involves combustion — reacting with oxygen to produce carbon dioxide, ash, and heat. New substances are formed → chemical change.
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| Question | Answer | Explanation |
|--------|--------|-----------|
| 1 | b. chemical change | New substances formed by bacteria |
| 2 | b. physical change | Sand moves, no new substances |
| 3 | b. physical change | Change of state = physical |
| 4 | Drilling a hole (drill image) | Shape changed, no new substance |
| 5 | b. physical change | Melting = state change |
| 6 | a. closing the door | Position change only |
| 7 | b. physical change | Melting = state change |
| 8 | b. match burning | Combustion = chemical change |
| 9 | b. chemical change | Burning produces new substances |
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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. So, it’s 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) is a change in physical state. The substance remains the same chemically — no new substances form. This is a physical change.
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4. Which is an example of a physical change?
(Images shown: birthday cake with candles, campfire, drill, bread being baked)
✔ Answer: drilling a hole in wood (represented by the drill image)
Explanation: Drilling a hole changes the shape of the wood but does not create new substances. It’s a physical change.
Other options:
- Candles burning → chemical change (combustion)
- Campfire → chemical change (burning)
- Bread baking → chemical change (cooking causes chemical reactions)
So, the drill represents a physical change.
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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 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:
- a. Closing the door: Only position changes → physical change
- b. Cracking an egg: The shell breaks, and contents spill — but the egg itself may begin to spoil or react (but technically, cracking is a physical change). However, cracking an egg can lead to chemical changes if exposed to air, so it's borderline.
- c. Turning off the light: Electrical process, but no matter change → more of an energy change
- d. Putting milk back in fridge: Temperature change, but no new substances → physical, but not a true change unless it affects the milk
But among these, closing the door is clearly a physical change with no transformation of matter.
👉 Best answer: a. closing the door
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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: Ice cream melts from solid to liquid due to heat, but its composition stays the same. No new substances are formed. 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:
- a. Water freezing → physical change (state change)
- b. Match burning → combustion → produces ash, gases, heat → chemical change
- c. Dew on grass → condensation → physical change
- d. Magnetizing a nail → temporary physical property change → physical change
So, match burning is the only 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 charcoal involves combustion — reacting with oxygen to produce carbon dioxide, ash, and heat. New substances are formed → chemical change.
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✔ Final Answers Summary:
| Question | Answer | Explanation |
|--------|--------|-----------|
| 1 | b. chemical change | New substances formed by bacteria |
| 2 | b. physical change | Sand moves, no new substances |
| 3 | b. physical change | Change of state = physical |
| 4 | Drilling a hole (drill image) | Shape changed, no new substance |
| 5 | b. physical change | Melting = state change |
| 6 | a. closing the door | Position change only |
| 7 | b. physical change | Melting = state change |
| 8 | b. match burning | Combustion = chemical change |
| 9 | b. chemical change | Burning produces new substances |
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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 chemical change vs physical change worksheet.
