Two chemical reactions are shown: 2Mg + O2 → 2MgO
CaCO3 → CaO + CO2
Which statement is true? (5 points)

a
Both are synthesis reactions.

b
Both are decomposition reactions.

c
A is a synthesis reaction, and B is a decomposition reaction.

d
A is a decomposition reaction, and B is a synthesis reaction.

C

Explanation:

A synthesis reaction results in something being created/being more complex. For example, A + B = AB. The first equation is a synthesis reaction as it follows the formula. A decomposition reaction is the opposite of a synthesis reaction. Instead, it results in something being decomposed. For example, AB = A + B. The second equation represents a decomposition reaction.