Which of the following reactions are exothermic? | Chemistry Questions & Answers

A pure substance can only be

A) Compound	B) an element
C) an element or a compound	D) a heterogeneous mixture

Answer & Explanation Answer: C) an element or a compound

Explanation:

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Who is the father of modern chemistry?

A) Priestley	B) Lavoisier
C) Dalton	D) Mendeleeff

Answer & Explanation Answer: B) Lavoisier

Explanation:

Antoine-Laurent de Lavoisier, a french chemist is considered as the "Father of Modern Chemistry."

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A) 1	B) 2
C) 3	D) 4

Which of the following reactions are exothermic?

$1) C + O_{2} \to {CO}_{2} 2) 2 Mg + O_{2} \to 2 MgO 3) {CuSO}_{4} + 5 H_{2} O \to {CuSO}_{4} . 5 H_{2} O 4) All the above$