Question

which of the following describes a physical change? 10 points a marshmallow burns over a open flame icicles melt from a rooftop a cat eats a piece of fish milk turns sour which of the following describes a chemical change? 10 points clear liquids mix, producing a cloudy liquid with yellow chunks silver coins are melted down and shaped into a solid brick salt is added to a pot of hot water, and the waters boiling point changes an apple is chopped into eight slices the law of conservation of mass states that * 10 points matter is neither created nor destroyed the mass of an object remains the same even if chemical change occurs the number of molecules before and after a chemical reaction cannot change mass is lost when a chemical change occurs

Explanation:

1. Physical changes do not change the substance's chemical composition. Icicle - melting is a phase change from solid to liquid without altering the water's chemical identity. Burning a marshmallow, a cat eating fish, and milk turning sour are chemical changes.
2. Chemical changes result in new substances. Mixing clear liquids to form a cloudy liquid with yellow chunks indicates a chemical reaction forming new substances. Melting silver coins, adding salt to water (boiling - point change is a physical property change), and chopping an apple are physical changes.
3. The law of conservation of mass states that matter is neither created nor destroyed in a chemical reaction.

Answer:

1. Icicles melt from a rooftop
2. clear liquids mix, producing a cloudy liquid with yellow chunks
3. matter is neither created nor destroyed