2. What harmful change/s is/are brought about when a metal reacts or mixes with acids​

hydrogen gas

When metal reacts with acids it produces metal salt and hydrogen gas ( H2 ) . All metals do not react with acids to evolve hydrogen gas . Only those metals react which is more reactive than hydrogen . When metal reacts with acid it forms a salt which is basic in nature and releases hydrogen gas.

Explanation:

When metals react with other substances, the gradual wearing away or corrosion of a metal results.This may lead to deterioration of metals

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explanation:

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answer

fusion: the energy source of stars. the energy released from the collapse of the gas into a protostar causes the center of the protostar to become extremely hot. when the core is hot enough, nuclear fusion commences. fusion is the process where two hydrogen atoms combine to form a helium atom, releasing energy.

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