Changes of State in Water Worksheets - Free Printable

Let's solve the worksheet titled "Changes of State in Water" step by step. The goal is to fill in the blanks using the correct terms related to the changes of state: Solid, Liquid, Gas, and processes like Freezes, Melts, Condensation, Evaporates, Vapor.

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Understanding the Diagrams

- Solid: Ice cube (water in solid form)
- Liquid: Water in a glass
- Gas: Steam or vapor coming from a pot (water vapor)

Processes:
- Melts: Solid → Liquid (e.g., ice melting into water)
- Freezes: Liquid → Solid (e.g., water freezing into ice)
- Evaporates: Liquid → Gas (e.g., water turning into vapor)
- Condensation: Gas → Liquid (e.g., steam forming droplets)
- Vapor: The gaseous form of water

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Now, let’s complete each sentence:

1. Water changes to ________ with heat.
→ When heat is added, water turns into gas.
✔ Answer: Gas

2. Water becomes a solid when it ________.
→ When water freezes, it becomes ice (solid).
✔ Answer: Freezes

3. Water ________ when it is heated.
→ Heating causes liquid water to turn into vapor.
✔ Answer: Evaporates

4. Water forms ________ when it cools.
→ When water vapor cools, it turns back into liquid (condensation).
✔ Answer: Condensation

5. Ice (water) will change to liquid when it ________.
→ Ice melts into liquid water when warmed.
✔ Answer: Melts

6. When water is ________, it changes to gas.
→ This describes evaporation.
✔ Answer: Heated *(Note: "Heated" isn't on the word bank, but it's implied. Alternatively, if only words from the list are allowed, perhaps “evaporates” fits better? Let's check the original wording.)*
But looking at the instruction: *"Finish the sentences using the words above:"* — the words listed are: Solid, Liquid, Gas, Freezes, Melts, Condensation, Evaporates, Vapor

So we must use only those words.

So: When water is ________, it changes to gas.
→ The process is evaporates.
✔ Answer: Evaporates

7. Tap water is ________.
→ Tap water is in liquid form.
✔ Answer: Liquid

8. Evaporated water is ________.
→ Water that has evaporated is now in gas form, also called vapor.
✔ Answer: Vapor

9. The 3 states of water are ________, ________, and ________.
→ The three states are solid, liquid, and gas.
✔ Answer: Solid, Liquid, Gas

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✔ Final Answers:

1. Water changes to Gas with heat.
2. Water becomes a solid when it Freezes.
3. Water Evaporates when it is heated.
4. Water forms Condensation when it cools.
5. Ice (water) will change to liquid when it Melts.
6. When water is Evaporates, it changes to gas.
*(Wait – this is awkward. It should be: "When water evaporates, it changes to gas." But the blank is after "is", so maybe rephrase?)*

Let’s double-check sentence 6:
> When water is ________, it changes to gas.

We need a word that fits grammatically. "Evaporates" is a verb, but "is" needs a noun or adjective.

But looking again — perhaps the intended answer is heated, but it’s not on the list.

Wait — the word bank includes: Solid, Liquid, Gas, Freezes, Melts, Condensation, Evaporates, Vapor

So “Evaporates” is a verb, but here we have “is ________”, which implies a noun or adjective.

Hmm. Maybe the sentence is meant to be:
"When water evaporates, it changes to gas." — but then the blank is missing the verb.

Alternatively, could it be:
"When water is heated, it changes to gas." — but "heated" is not on the list.

Perhaps there’s a typo in the worksheet, or we’re overthinking.

But since only the given words can be used, and “Evaporates” is the only term for the process, maybe the sentence is meant to be:
"When water is evaporated, it changes to gas." — but that’s passive.

Still, “Evaporates” might be acceptable as a verb form.

Alternatively, perhaps the intended answer is vapor, but that doesn’t fit.

Wait — look at sentence 8:
> Evaporated water is Vapor — so vapor = gas.

But sentence 6:
> When water is ________, it changes to gas.

Best fit: When water is heated, but “heated” isn’t in the word bank.

So perhaps the intended answer is evaporates — even though grammar is off.

Alternatively, maybe the sentence is:
"When water is evaporated, it changes to gas." — but again, “evaporated” not in list.

Given the constraints, the most likely intended answer is “evaporates”, assuming the sentence is meant to read:
"When water evaporates, it changes to gas."

But the structure says "is ________", so perhaps it's a mistake.

Alternatively, maybe the word Vapor is meant for this?

No — "When water is vapor, it changes to gas" doesn’t make sense.

So perhaps the best interpretation is that the sentence is poorly phrased, and the intended answer is Evaporates, even if it’s grammatically awkward.

Alternatively, maybe the blank is meant to be filled with heated, but it’s not on the list.

Given the available words, and the context, I think the intended answer is:

✔ 6. When water is evaporated, it changes to gas. → But “evaporated” not in list.

Wait — the word Evaporates is in the list. So maybe the sentence is:
"When water evaporates, it changes to gas." — so the blank is for the verb.

But the sentence says: "When water is ________"

That suggests a noun or adjective.

So perhaps the intended word is Vapor? No.

Another possibility: Maybe the sentence is:
"When water is heated, it changes to gas." — but “heated” not in list.

I think there may be an error in the worksheet.

But since Evaporates is the only word in the list that refers to the process of becoming gas, and it's a verb, perhaps the sentence is meant to be:
"When water evaporates, it changes to gas." — so the blank is for the verb.

But the sentence says "is ________", so it’s incorrect.

Wait — perhaps the sentence is:
"When water is evaporated, it changes to gas." — still not in the list.

Alternatively, maybe the blank is for gas, but that doesn’t make sense.

Let’s re-read the full sentence:
> 6. When water is ________, it changes to gas.

This is logically flawed. If water changes to gas, then it’s already undergoing the change. But the sentence says "when water is [something], it changes to gas".

So the blank should be something like "heated" or "boiled".

Since none of those are in the list, perhaps the closest is Evaporates — but again, not grammatical.

Alternatively, maybe the sentence is supposed to be:
"When water is heated, it changes to gas." — but "heated" not in list.

Given the constraints, I think the intended answer is Evaporates, even if the grammar is off.

Alternatively, perhaps the sentence is:
"When water is in the liquid state, it changes to gas" — but no such phrase.

After careful thought, the most plausible explanation is that the sentence is miswritten, and the intended meaning is:
"When water evaporates, it changes to gas." — so the blank is for Evaporates, and the "is" is a typo.

So we’ll go with:

✔ 6. Evaporates

Even though it’s grammatically awkward, it’s the only logical choice from the word bank.

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✔ Final Answer Key:

1. Gas
2. Freezes
3. Evaporates
4. Condensation
5. Melts
6. Evaporates
7. Liquid
8. Vapor
9. Solid, Liquid, Gas

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✔ Summary:

| # | Sentence | Answer |
|---|--------|--------|
| 1 | Water changes to ________ with heat. | Gas |
| 2 | Water becomes a solid when it ________. | Freezes |
| 3 | Water ________ when it is heated. | Evaporates |
| 4 | Water forms ________ when it cools. | Condensation |
| 5 | Ice (water) will change to liquid when it ________. | Melts |
| 6 | When water is ________, it changes to gas. | Evaporates *(best fit despite grammar issue)* |
| 7 | Tap water is ________. | Liquid |
| 8 | Evaporated water is ________. | Vapor |
| 9 | The 3 states of water are ________, ________, and ________. | Solid, Liquid, Gas |

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💡 Note:

Sentence 6 has a grammatical issue. A better version would be:
"When water evaporates, it changes to gas."
But based on the given word bank and structure, Evaporates is the intended answer.

Let me know if you'd like a corrected version of the worksheet!