Question

Give reasons as why the following are considered as a chemical change: 3. A piece of iron nail kept in the atmosphere rusts. 4. A piece of magnesium strip is dropped into a beaker containing dilute hydrochloric acid.

Answer 1

Answer:

hiii,

some examples is in photo you can understand with that only.

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Answer 2

See it rusts and we know we cannot obtain the same object back after it rusts.Which is a property of chemical change, in chemical change the substance cannot be obtained back.The colour of the solution changes from blue to green and it rusts.This is an irreversible change, therefore it's a chemical change