Question

1. do you think the property of magnetism is a physical property or a chemical one? why? magnetism is a physical property because it can be observed without changing the chemical identity of a substance. 3. name a physical change and a chemical change associated with burning a candle. explain how you know. physical change: melting of wax (chemical composition of wax remains the same). chemical change: burning of wick and wax (new substances like carbon - dioxide and water vapor are formed). 4. name three physical changes that you can think of and explain how you know they are physical changes. 5. do temperature changes always indicate a chemical change?

Explanation:

4.

• Melting ice: Chemical composition of water remains H₂O, only state changes from solid to liquid.
• Tearing paper: Paper's chemical makeup doesn't change, just its physical form is altered.
• Dissolving salt in water: Salt and water's chemical identities are intact, it's a physical - mixing process.

1. No. Temperature changes can be due to physical processes like melting (heat absorbed to change state without chemical reaction) or simply heating a substance without altering its chemical composition. For example, heating a metal rod just increases its temperature physically, no new substances are formed.

Answer:

1. Melting ice: Chemical composition remains same, only state changes. Tearing paper: Chemical makeup unchanged, physical form altered. Dissolving salt in water: Chemical identities intact, physical - mixing.
2. No. Can be due to physical processes like melting or simple heating without chemical change.