Chemical and Physical Changes of Matter - Free Printable
Educational worksheet: Chemical and Physical Changes of Matter. Download and print for classroom or home learning activities.
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Step-by-step solution for: Chemical and Physical Changes of Matter
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Show Answer Key & Explanations
Step-by-step solution for: Chemical and Physical Changes of Matter
Let's solve this step-by-step by identifying whether each change is chemical or physical, based on the definitions provided:
- Chemical Change: A chemical reaction occurs, new substances are formed, and energy is absorbed or released. The identity of the substance changes.
- Physical Change: Matter changes form (like state or shape), but its chemical identity remains the same.
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- Water (liquid) turns into water vapor (gas).
- No new substance is formed; it’s just a change in state.
- ✔ Physical Change
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- Milk spoils due to bacterial action, producing lactic acid.
- New substances are formed (lactic acid, etc.), so the chemical composition changes.
- ✔ Chemical Change
---
- Sugar molecules disperse in water, but they remain sugar molecules.
- No chemical reaction; sugar can be recovered by evaporation.
- ✔ Physical Change
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- Iron reacts with oxygen and water to form iron oxide (rust).
- A new substance is formed: Fe₂O₃.
- ✔ Chemical Change
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- This is a neutralization reaction:
HCl + NaOH → NaCl + H₂O
- New substances (salt and water) are formed.
- ✔ Chemical Change
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- Complex molecules like proteins, fats, and carbohydrates are broken down into simpler ones (amino acids, glucose, etc.) via enzymes.
- Chemical bonds are broken and remade.
- ✔ Chemical Change
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- Solid water (ice) becomes liquid water.
- Same substance, just different state.
- ✔ Physical Change
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- Acid rain (H₂SO₄ or HNO₃) reacts with calcium carbonate (CaCO₃) in limestone:
CaCO₃ + H₂SO₄ → CaSO₄ + CO₂ + H₂O
- Carbon dioxide gas is produced — new substances form.
- ✔ Chemical Change
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- Only the size and shape change; no new substances are formed.
- The glass is still made of the same material.
- ✔ Physical Change
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- Reaction: 2H₂O₂ → 2H₂O + O₂
- Hydrogen peroxide breaks down into water and oxygen — new substances.
- ✔ Chemical Change
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| # | Change Description | Type |
|---|--------------------|------|
| 1 | Heating water into steam | Physical |
| 2 | Milk going sour | Chemical |
| 3 | Dissolving sugar in water | Physical |
| 4 | Iron rusting | Chemical |
| 5 | HCl and NaOH forming salt and water | Chemical |
| 6 | Digesting food into nutrients | Chemical |
| 7 | Melting ice into water | Physical |
| 8 | Acid rain on limestone producing CO₂ | Chemical |
| 9 | Breaking a glass into pieces | Physical |
| 10 | Hydrogen peroxide decomposing | Chemical |
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✔ Summary:
- Physical Changes: 1, 3, 7, 9
- Chemical Changes: 2, 4, 5, 6, 8, 10
This worksheet helps distinguish between changes in form vs. changes in substance — key concepts in chemistry!
- Chemical Change: A chemical reaction occurs, new substances are formed, and energy is absorbed or released. The identity of the substance changes.
- Physical Change: Matter changes form (like state or shape), but its chemical identity remains the same.
---
1. Heating water into steam
- Water (liquid) turns into water vapor (gas).
- No new substance is formed; it’s just a change in state.
- ✔ Physical Change
---
2. Milk going sour
- Milk spoils due to bacterial action, producing lactic acid.
- New substances are formed (lactic acid, etc.), so the chemical composition changes.
- ✔ Chemical Change
---
3. Dissolving sugar in water
- Sugar molecules disperse in water, but they remain sugar molecules.
- No chemical reaction; sugar can be recovered by evaporation.
- ✔ Physical Change
---
4. Iron rusting
- Iron reacts with oxygen and water to form iron oxide (rust).
- A new substance is formed: Fe₂O₃.
- ✔ Chemical Change
---
5. Hydrochloric acid and sodium hydroxide reacting and forming salt and water
- This is a neutralization reaction:
HCl + NaOH → NaCl + H₂O
- New substances (salt and water) are formed.
- ✔ Chemical Change
---
6. Digesting food into nutrients
- Complex molecules like proteins, fats, and carbohydrates are broken down into simpler ones (amino acids, glucose, etc.) via enzymes.
- Chemical bonds are broken and remade.
- ✔ Chemical Change
---
7. Melting ice into water
- Solid water (ice) becomes liquid water.
- Same substance, just different state.
- ✔ Physical Change
---
8. Acid rain dripping onto limestone and making carbon dioxide gas
- Acid rain (H₂SO₄ or HNO₃) reacts with calcium carbonate (CaCO₃) in limestone:
CaCO₃ + H₂SO₄ → CaSO₄ + CO₂ + H₂O
- Carbon dioxide gas is produced — new substances form.
- ✔ Chemical Change
---
9. Breaking a glass into pieces
- Only the size and shape change; no new substances are formed.
- The glass is still made of the same material.
- ✔ Physical Change
---
10. Hydrogen peroxide decomposing into oxygen gas and water
- Reaction: 2H₂O₂ → 2H₂O + O₂
- Hydrogen peroxide breaks down into water and oxygen — new substances.
- ✔ Chemical Change
---
Final Answer Table:
| # | Change Description | Type |
|---|--------------------|------|
| 1 | Heating water into steam | Physical |
| 2 | Milk going sour | Chemical |
| 3 | Dissolving sugar in water | Physical |
| 4 | Iron rusting | Chemical |
| 5 | HCl and NaOH forming salt and water | Chemical |
| 6 | Digesting food into nutrients | Chemical |
| 7 | Melting ice into water | Physical |
| 8 | Acid rain on limestone producing CO₂ | Chemical |
| 9 | Breaking a glass into pieces | Physical |
| 10 | Hydrogen peroxide decomposing | Chemical |
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✔ Summary:
- Physical Changes: 1, 3, 7, 9
- Chemical Changes: 2, 4, 5, 6, 8, 10
This worksheet helps distinguish between changes in form vs. changes in substance — key concepts in chemistry!
Parent Tip: Review the logic above to help your child master the concept of physical changes of matter worksheet.
