Question

Which statement is correct about heat?

• A. It is a measure of the transfer of energy due a temperature difference
• B. The heat transfer is always from hot to cold
• C. The heat absorbed by the surroundings equals the heat released by the system
• D. The amount of heat lost or gained during a reaction is directly related to the enthalpy change of the reaction.
• E. All answers are correct

Answer 1

The correct option is E All answers are correct

All answers about heat are correct
A

It is a measure of the transfer of energy due a temperature difference. When two bodies have different temperatures, heat will be exchanged till thermal equilibrium is attained.
B
The heat transfer is always from hot to cold. Thus the body at higher temperature will lose heat and the body at lower temperature will gain heat.
C
The heat absorbed by the surroundings equals the heat released by the system
For example, if system releases 500 J heat, the surrounding will absorb 500 J heat.
D
The amount of heat lost or gained during a reaction is directly related to the enthalpy change of the reaction. The enthalpy change is the difference between the heat content of products and the heat content of reactants.