Question

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Answer 1

Answer:

Evaporation

Periodic changes

Q2

1) False. Rust is clearly a substance that is different from iron. Rusting is an example of a chemical change. A chemical property describes the ability of a substance to undergo a specific chemical change. A chemical property of iron is that it is capable of combining with oxygen to form iron oxide, the chemical name of rust.

2)False. When ammonium chloride is dissolved in water enery is absorbed as it is a endothermic reaction.When ammonium chloride dissolves in water, the temperature falls because the ammonium chloride is pulling heat in from its surroundings (the water), causing thetemperature to fall. Thus, the energy change is endothermic.so when dissolved in water the solution becomes colder.

3)False.Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely new substance with a new chemical formula. 

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Answer 2

Answer:

Don't know

Explanation:

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