I need help please ASAP

Copper monobromide.

Explanation:

To name the compound, we shall determine the oxidation number of copper in CuBr. This can be obtained as follow:

Br = –1

Cu =?

CuBr = 0

Cu + (–1) = 0

Cu – 1 = 0

Collect like terms

Cu = 0 + 1

Cu = +1

Thus, oxidation number of copper in CuBr is +1.

Therefore, the name of the compound is copper (I) bromide or copper monobromide

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.