Question

Which of the following reactions are exothermic?



1) C + O2 → CO22) 2Mg + O2 → 2MgO3) CuSO4 + 5H2O → CuSO4.5H2O4) All the above
A) 1
B) 2
C) 3
D) 4

Answer 1

the answer is d

hope this helps

Answer 2

Answer:

The correct option is D.

Explanation:

• The reaction of carbon with oxygen to form carbon dioxide is exothermic
• When magnesium is burned with oxygen, magnesium oxide is created along with light and heat. It is therefore an exothermic reaction.
• An exothermic reaction occurs when water is added to anhydrous copper(II) sulphate because the tube gets considerably heated when the water is added even slowly.
• An exothermic reaction is one in which the overall standard enthalpy change (H) is negative, according to thermochemistry.
• Exothermic processes typically produce heat.
• An exothermic reaction is one in which energy is given off as heat or light.
• In contrast to an endothermic process, which draws energy from its surroundings, an exothermic reaction transfers energy into the environment.
• The change in enthalpy (H) in an exothermic reaction will be negative.

All the reactions are exothermic.

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