Worksheet featuring nine illustrated questions about physical and chemical changes, including examples like sour milk, melting butter, and charcoal burning.

Let’s go through each question one by one and figure out the correct answers.

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Question 1:
Soured milk smells badly because bacteria have formed new substances in the milk. This is an example of __.
→ When bacteria change milk into something new (with a bad smell), that means the substance itself has changed. That’s a chemical change.
✔ Answer: b. chemical change

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Question 2:
Sand flowing in an hour glass is an example of __.
→ Sand is just moving from top to bottom — it’s still sand. No new substance is made. That’s a physical change.
✔ Answer: b. physical change

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Question 3:
The change of state from a gas to a liquid is an example of __.
→ Like when steam turns into water — it’s still H₂O, just changing form. That’s a physical change.
✔ Answer: b. physical change

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Question 4:
Which is an example of a physical change?
Images show: cake with candles, fire, camera, bread, and... wait — we need to pick which image shows a physical change.
But since no options are listed under the images, let’s think:
- Cake with candles → burning = chemical
- Fire = chemical
- Camera taking photo → not really a material change? Maybe physical? But tricky.
- Bread → if it’s being sliced or toasted? Toasting = chemical, slicing = physical.
Actually, looking again — the question says “Which is an example of a physical change?” and there’s a blank line. Probably expects you to write one.
But since this is multiple choice style elsewhere, maybe it’s implied to pick from the images?
Wait — perhaps the student is supposed to circle or write one. Since we can’t see instructions, let’s assume common examples:
Melting ice, breaking glass, cutting paper — those are physical.
In the images: maybe the camera? Not really. Or the bread? If it’s just sitting there — not a change.
Actually, looking at the layout — perhaps the question is incomplete? But in many worksheets, they expect you to recognize that breaking or changing shape without new substance is physical.
Since no clear answer is given, but based on standard knowledge — let’s say cracking an egg (from Q6) is physical — but that’s later.
Wait — maybe for Q4, since it’s open-ended, we can say:
Example: cutting bread (if shown) or melting ice cream (Q7).
But to be safe — let’s note that physical changes don’t make new substances. So any process like melting, freezing, breaking, cutting — is physical.
For now, since no specific answer is forced, and the worksheet might expect writing one — but we’ll skip to next and come back if needed.

Actually — looking again at the image: Q4 has 4 pictures: cake (burning candles = chemical), fire (chemical), camera (maybe physical? but not really a material change), bread (if sliced = physical).
Perhaps the intended answer is bread if it’s being cut — but it’s not clear.
Alternatively, maybe the question is misaligned. Let’s move on and assume for now we’ll handle it later.

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Question 5:
The melting of butter when left out in a warm room is an example of __.
→ Butter melts — it goes from solid to liquid, but it’s still butter. No new substance. That’s a physical change.
✔ Answer: b. physical change

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Question 6:
Which of the following is an example of physical change?
a. closing the door → no material change, just position — physical?
b. cracking an egg → shell breaks, but egg content same — physical
c. turning off electric light → energy change, not material — not typically classified as physical/chemical in this context
d. putting milk back in fridge → temperature change, but milk unchanged — physical?

Actually, cracking an egg is a classic example of physical change — you’re changing shape, not making new substance.
✔ Answer: b. cracking an egg

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Question 7:
An ice cream cone melting on a hot day is an example of __.
→ Ice cream melts — solid to liquid, still ice cream. Physical change.
✔ Answer: b. physical change

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Question 8:
Which of the following describes a chemical change?
a. water freezing → physical
b. match burning → fire, smoke, ash — new substances → chemical
c. dew on grass → condensation — physical
d. magnetizing a nail → physical (magnetic property changes, but not chemical)
✔ Answer: b. match burning

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Question 9:
Charcoal burning on the grill is an example of __.
→ Burning = combustion = new substances (ash, CO₂, etc.) → chemical change.
✔ Answer: b. chemical change

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Now back to Question 4:
“Which is an example of a physical change?” with 4 images:
- Cake with lit candles → burning = chemical
- Fire → chemical
- Camera → taking a photo involves light and film/digital sensor — not a material change in the object itself? Ambiguous.
- Bread → if it’s sliced or torn, that’s physical. The image shows sliced bread — so likely bread is the intended answer.
So we’ll go with: bread (assuming it’s being cut or just exists as sliced — physical change in form)

But since the question says “which is”, and it’s multiple images, probably expects you to identify one. In many worksheets, they accept “cutting bread” or similar.

To be precise — let’s say: slicing bread is a physical change.

But since the answer blank is empty, and we’re to provide final answers — perhaps for Q4, we write:
slicing bread or breaking bread — but to match format, maybe just “bread” isn’t enough.

Wait — looking at the original image description: Q4 has four small images: cake, fire, camera, bread. And the question is “Which is an example of a physical change?” — so likely, the student is to choose one. Among these, bread (if interpreted as being cut or just existing in changed form) is the best candidate. Camera might involve physical movement, but not typically taught as physical change in matter. So I’ll go with bread.

But to be accurate — let’s define: physical change = change in size, shape, state, without new substance.
- Cake with candles: burning wax and wick → chemical
- Fire: combustion → chemical
- Camera: no material change in the camera itself during use? Or if it’s a disposable camera, developing film is chemical — too complex.
- Bread: if it’s sliced, that’s physical. The image shows sliced bread — so yes.

✔ For Q4: bread (or specifically, slicing bread)

But since the answer format might expect a word, and others are multiple choice — perhaps the worksheet intends for students to write one. We’ll put: slicing bread

However, to keep consistency with other answers that are multiple choice, and since Q4 doesn’t have options, I think it’s fine to state:

Answer for Q4: slicing bread (or any physical alteration like cutting, breaking, etc.)

But let’s finalize all:

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Final Answers:

1. b. chemical change
2. b. physical change
3. b. physical change
4. slicing bread (or equivalent physical change) — but since it’s open, we’ll write: cutting bread
5. b. physical change
6. b. cracking an egg
7. b. physical change
8. b. match burning
9. b. chemical change

Wait — for Q4, to match the format, perhaps the expected answer is one of the images, and since it’s “which is”, and no options, maybe it’s acceptable to say “the bread” or “slicing bread”. But to be safe, I’ll write:

4. cutting bread

But let’s check online or standard answers — actually, in many such worksheets, for Q4, they might expect “melting ice” or something, but here the images are given. Another thought: the camera — if it’s a pinhole camera or something, but unlikely. I think bread is safest.

Alternatively, perhaps the question is to select from the images, and the answer is the bread image. But since we’re to write the answer, I’ll put:

4. bread (as in slicing or cutting it)

But to make it clear:

After careful thought, for Q4, the best answer among the images is bread, assuming it represents a physical change like slicing.

So final compiled answers:

1. b
2. b
3. b
4. bread (or cutting bread)
5. b
6. b
7. b
8. b
9. b

But for Q4, since it’s not multiple choice, and the blank is there, perhaps write: "cutting bread"

Yes.

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Final Answer:

1. b. chemical change
2. b. physical change
3. b. physical change
4. cutting bread
5. b. physical change
6. b. cracking an egg
7. b. physical change
8. b. match burning
9. b. chemical change