Question

following is a list of observations from a chemistry laboratory. place them in the appropriate category. evidence of a chemical change no evidence for a chemical change. burning toast wax melting water boiling a candle being lit a car rusting a white cloudy substance occurs after mixing two clear solutions leaves changing color in october crushing a rock with a hammer yellow and blue paints mixed together

Explanation:

A chemical change results in a new substance with different properties. Burning toast creates new carbon - based substances. A candle burning produces carbon dioxide and water. A car rusting forms iron oxide. Mixing two clear solutions to get a white cloudy substance is a chemical reaction forming a precipitate. Leaves changing color is due to chemical reactions in the leaf. Wax melting, water boiling, crushing a rock, and mixing paints are physical changes where no new substances are formed.

Answer:

Evidence of a chemical change: Burning toast, A candle being lit, A car rusting, A white cloudy substance occurs after mixing two clear solutions, Leaves changing color in October
No evidence for a chemical change: Wax melting, Water boiling, Crushing a rock with a hammer, Yellow and blue paints mixed together