Here's the correct solution with explanations for each question:
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1. What is a physical property?
✔ Correct Answer: D — can be observed or measured without changing the composition of matter
Explanation:
Physical properties are characteristics like color, density, melting point, or conductivity — things you can observe or measure *without* altering what the substance is made of. For example, measuring the boiling point of water doesn’t turn it into something else.
- Option A lists chemical properties (flammability, toxicity, etc.).
- Option B describes chemical properties.
- Option C is not a property at all — it’s a process.
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2. What is a chemical property?
✔ Correct Answer: A — characteristic of a substance that may be observed when it participates in a chemical reaction
Explanation:
Chemical properties describe how a substance behaves during a chemical change — for example, iron rusting or wood burning. You can only observe these *when* the substance reacts and changes its chemical identity.
- Option B lists physical properties (odor, boiling point, conductivity).
- Option C describes physical properties.
- Option D is about states of matter — not a property type.
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3. Which is an example of a physical change?
✔ Correct Answer: A — A chemical going from solid to liquid
Explanation:
A physical change alters the form or state of matter *without* changing its chemical composition. Melting (solid → liquid) is a classic example — ice melts to water, but it’s still H₂O.
- Option B (catching fire) = combustion = chemical change.
- Option C (bubbles forming when chemicals mix) usually indicates gas production = chemical change.
- Option D (copper growing silver coat) = displacement reaction = chemical change.
> Note: The phrase “a chemical going from solid to liquid” is slightly misleading — it should say “a substance,” but in context, it refers to a phase change, which is physical.
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4. Which is an example of a chemical change?
✔ Correct Answer: D — The formation of bubbles when two chemicals are put together
Explanation:
Bubbles often indicate a gas is being produced — a sign of a chemical reaction (e.g., vinegar + baking soda → CO₂ gas). This means new substances are formed.
- Option A (bending wire until it breaks) = physical change (shape/structure altered, no new substance).
- Option B (solid to gas) = sublimation = physical change.
- Option C (liquid to solid) = freezing = physical change.
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5. Which state of matter has both a definite volume and definite shape?
✔ Correct Answer: B — Solid
Explanation:
Solids have fixed shapes and volumes because their particles are tightly packed and vibrate in place.
- Liquids have definite volume but take the shape of their container.
- Gases have neither definite shape nor volume.
- Plasma (ionized gas) also lacks definite shape and volume.
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✔ Final Answers:
1.
D
2.
A
3.
A
4.
D
5.
B
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Parent Tip: Review the logic above to help your child master the concept of physical properties of matter worksheet.
