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.

Iknow the answer is a but i don't know why

What are the spectator ions in 2h+ + so42- + ca2+ + 2r → caso4 + 2h+ + 21?

Which is a difference between molecular compounds and ionic compounds? select the correct answer below: question 5 options: molecular compounds typically form between a metal and a nonmetal, while ionic compounds typically form between nonmetals. molecular compounds result from the transfer of electrons between atoms to form ions, while ionic compounds result from the sharing of electrons between neutral atoms. molecular compounds are formed of discrete, neutral molecules, while ionic compounds are formed of large repeating arrays of opposite charges. molecular compounds have high melting points and high boiling points, while ionic