Plz help. with both will mark brainest

The first one is balanced, but the second one is unbalanced.

Explanation:

Second one is unbalanced because there is an additional H and Cl on the right side. To fix it you would add a two in front of the HCl on the left side.

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

since electrons are negative the answer is neagtaive