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How did the experiement with boiling water compare with the experiment in which magnesium was added to hydrochloric acid? Both resulted in gas formation. Both resulted in temperature change. Both involved chemical change. Both involved physical change. One involved chemical change while the other involved physical change.

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1,2, and 5 are all correct
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Answer is:

Both resulted in gas formation.

Both resulted in temperature change.

One involved chemical change while the other involved physical change.

1) Balanced chemical reaction of magnesium and hydrochloric acid:

Mg + 2HCl → MgCl₂ + H₂(g).

Hydrogen(H₂) is a gas. This is exothermic reaction (energy is released). This is chemical change, new substances are formed.

2) Boiling water is physical change, no new substances are formed. This is endothermic reaction, heat is added. Steam is gas.

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