Question

1. list the types of evidence that a physical change has taken place
2. which of these is not a physical change?

□) freezing water to make ice cubes
□) tearing a piece of aluminum foil
□) cooking a grilled cheese sandwich
□) boiling water for soup

Explanation:

Question 3:

To determine evidence of physical change, recall that physical changes retain the substance's chemical identity. Evidence includes changes in state (e.g., melting, freezing), changes in shape/size (tearing, cutting), dissolving (without chemical reaction), or phase transitions (boiling, condensing). These changes don't form new substances.

Analyze each option:

• Freezing water: Changes state (liquid to solid), no new substance (still H₂O) → physical change.
• Tearing aluminum foil: Changes shape/size, no new substance → physical change.
• Cooking a grilled cheese sandwich: Involves heating cheese (melting, but also browning/caramelization, which are chemical changes as new compounds form) and bread (browning, starch breakdown) → chemical change (not physical).
• Boiling water: Changes state (liquid to gas), no new substance (still H₂O) → physical change.

Answer:

• Change in state (e.g., melting, freezing, boiling, condensing)
• Change in shape or size (e.g., tearing, cutting, breaking)
• Dissolving (if no chemical reaction occurs, like dissolving sugar in water)

Question 4: