Question

property physical or chemical? melting point of 1,538°c rusts in the presence of oxygen magnetic can be reshaped when heated

Explanation:

To determine if a property is physical or chemical, we use the definitions:

• Physical property: A characteristic that can be observed or measured without changing the substance’s chemical identity (e.g., melting point, magnetism, malleability).
• Chemical property: A characteristic that describes how a substance reacts with other substances (involves a chemical change, e.g., rusting).

1. Melting point of \( 1,538^\circ \text{C} \)

Melting point is measured without altering the substance’s chemical identity.
Classification: Physical

2. Rusts in the presence of oxygen

Rusting involves a reaction with oxygen (forming iron oxide), which is a chemical change.
Classification: Chemical

3. Magnetic

Magnetism is observed without changing the substance’s chemical composition.
Classification: Physical

4. Can be reshaped when heated

Reshaping (malleability) is a physical change (no new substance is formed).
Classification: Physical

Answer:

s (from top to bottom):

1. Physical
2. Chemical
3. Physical
4. Physical