What is the difference between a substitution reaction and an addition reaction? Check all that apply.
a. In an addition reaction, two reactants exchange parts to give two new products.
b. In an addition reaction, two reactants add together to form a single product, with no atoms left over.
c. In a substitution reaction, two reactants exchange parts to give two new products.
d. In a substitution reaction, two reactants add together to form a single product, with no atoms left over.