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:

For question 3:

Step1: Recall physical change evidence

Physical changes involve changes in state (like melting, freezing), shape, size, or phase without new substances. Evidence includes change in state (solid ↔ liquid ↔ gas), change in shape/size (tearing, cutting), dissolving (no new substance), or separation (like filtering).

Step2: List common evidences

Common evidences: Change in state (e.g., melting ice), change in shape/size (tearing paper), dissolving (sugar in water), separation (sand from water), or change in appearance (like crushing a can).

Physical changes do not form new substances. Freezing water (state change, H₂O remains), tearing foil (shape change, aluminum remains), boiling water (state change, H₂O remains) are physical. Cooking a grilled cheese involves chemical reactions (cheese melting and browning, bread toasting) forming new substances, so it’s a chemical change (not physical).

Answer:

Change in state (e.g., melting, freezing), change in shape/size (e.g., tearing, cutting), dissolving, separation, or change in appearance (examples include freezing water, tearing foil, dissolving salt, filtering sand from water, crushing a can).

For question 4: