20) Study of
reaction
heat
is caused
A. Organic Chemistry
B. Thermodynamic
C. Inorganic Chemistry.
D. Physical Chemistry

The answer is thermodynamic because in this branch branch we study heat and Temperature and their relationship

Explanation:

I hope this will help you:)

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< > according to newton's third law of motion, forces always act in equal but opposite pairs. another way of saying this is for every action, there is an equal but opposite reaction.< >