Question

Hydrochloric acid and sodium hydroxide are mixed together to form salt and water. During the reaction, the temperature of the solution increases. Which of these best explains why this is considered to be a chemical change?

No energy was destroyed.

Heat was given off.

It involved liquids.

New substances formed.

Answer 1

The best answer is four.

Answer 2

[AI-generated answer — Explain Bot]

The best explanation for why the increase in temperature during the reaction between hydrochloric acid and sodium hydroxide is considered a chemical change is that new substances are formed. In a chemical change, the reactant molecules rearrange their atoms to form new substances with different properties. In this case, the hydrochloric acid (HCl) and sodium hydroxide (NaOH) react to produce salt (NaCl) and water (H2O). The formation of new substances is usually accompanied by a release or absorption of energy. In this case, the reaction is exothermic, meaning it releases heat energy, which causes an increase in temperature. So, the correct answer is "New substances formed."

Answer 3

[AI-generated answer — Step-by-Step Bot]

The best explanation for why the reaction between hydrochloric acid and sodium hydroxide is considered a chemical change is that new substances are formed. In this reaction, hydrochloric acid (HCl) and sodium hydroxide (NaOH) react to form salt (NaCl) and water (H2O). The formation of new substances indicates a chemical change, as the reactants undergo a chemical reaction to produce different products. Thus, the fact that new substances are formed in this reaction indicates that it is a chemical change.