Which statements are true? Δ?ΔH for an exothermic reaction is positive. When energy is transferred as...
Which statements are true?
Δ?ΔH for an exothermic reaction is positive.
When energy is transferred as heat from the surroundings to the system, Δ?ΔH is negative.
When energy is transferred as heat from the system to the surroundings, Δ?ΔH is negative.
The evaporation of water is an exothermic process.
Δ?ΔH for an endothermic reaction is positive.
A combustion reaction is exothermic.
Homework Answers
1)
False.
ΔH for exothermic reaction is negative
2)
False
Heat is flowing into the system.
So, this is endothermic reaction.
ΔH would be positive
3)
True
Heat is flowing out of the system.
So, this is exothermic reaction.
ΔH would be negative
4)
False.
Evaporation requires heat.
So, this is endothermic.
5)
True
Δ?ΔH for an endothermic reaction is positive.
6)
True
A combustion reaction is exothermic.
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