In both physical and chemical changes,
a. energy can be gained or lost.
b. matter is created
c. matter is destroyed
d. both a and b
rite your answers on the lines below.

Explanation:

Energy can be gained or lost in both physical and chemical changes.

Most physical changes involve energy gain or loss. For example:

Similar reasoning can be made about freezing, evaporation, condensation, and many other physical changes.

As per chemical changes, in order to the reactant substances break their bonds energy must be gained, and as new bonds are formed to constitute the product substaces energy is loss. The net change of energy will tell if the reaction is endothermic (net gain of energy) or exothermic (net release or loss of energy).

In order to meet the energy conservation law, the energy that is gained or lost by a substance is lost or gained by other substance.

As per the options b. and c. the law of conservation of mass states that energy can be never be created or destroyed, so those options are incorrect.

answer:

the reaction is type of combination reaction.

explanation:

on the product side, there are 2 molecules of bonded to fe   which means one atom of fe are combined two molecules of . so, balanced chemical equation becomes :

this reaction follows the reaction type of combination reaction. a combination reaction is defined as chemical reaction in which reactants combines together to form a single product.

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