Question

physical and chemical properties & changes worksheet
physical property: chemical property: explanation:

1. magnetic
2. flammable
3. red color
4. reacts violently with sodium
5. temperature
6. malleable (can be hammered thin without bre
7. dissolves in water
8. mass
9. produces a different gas when heated.

Answer:

To solve this, we classify each property as physical (observed without changing substance) or chemical (involves chemical change):

1. Magnetic

• Physical Property: Magnetic attraction is observed without altering the substance’s chemical identity.
• Explanation: It describes a physical characteristic (ability to be attracted to a magnet) without a chemical reaction.

2. Flammable

• Chemical Property: Flammability involves burning (a chemical reaction with oxygen) to form new substances.
• Explanation: Requires a chemical reaction (combustion) to observe, so it’s a chemical property.

3. Red color

• Physical Property: Color is a visible physical characteristic, no chemical change needed to observe.
• Explanation: Observed directly; the substance’s chemical identity remains unchanged.

4. Reacts violently with sodium

• Chemical Property: Reacting with sodium involves forming new compounds (a chemical reaction).
• Explanation: Requires a chemical reaction (interaction with sodium) to occur, so it’s chemical.

5. Temperature

• Physical Property: Temperature describes a physical state (hot/cold) without changing the substance’s chemistry.
• Explanation: A physical parameter (like melting point, boiling point) related to energy, not chemical identity.

6. Malleable (can be hammered thin)

• Physical Property: Malleability is a physical characteristic (shape change) without altering chemical composition.
• Explanation: Involves physical deformation (hammering) with no new substances formed.

7. Dissolves in water

• Physical Property: Dissolving (e.g., sugar in water) is a physical process (no chemical reaction, just mixing).
• Explanation: The substance retains its chemical identity (e.g., salt dissolves but is still NaCl).

8. Mass

• Physical Property: Mass is a physical measurement (amount of matter) with no chemical change.
• Explanation: Describes the quantity of the substance, not its chemical behavior.

9. Produces a different gas when heated

• Chemical Property: Heating causes a chemical reaction (decomposition, etc.) to form a new gas.
• Explanation: A new substance (gas) is produced, indicating a chemical change.

Summary Table:

Property	Physical Property?	Chemical Property?	Explanation
2. Flammable	No	Yes	Requires combustion (chemical reaction).
3. Red color	Yes	No	Visible physical characteristic.
4. Reacts with sodium	No	Yes	Involves chemical reaction with sodium.
5. Temperature	Yes	No	Physical state parameter, no chemical change.
6. Malleable	Yes	No	Physical deformation (hammering) without chemistry change.
7. Dissolves in water	Yes	No	Physical mixing (no new substance formed).
8. Mass	Yes	No	Physical measurement of matter quantity.
9. Produces gas when heated	No	Yes	Chemical reaction (new gas) occurs during heating.

(If you need a specific property analyzed, clarify the question!)