Quiz | Thermochemistry

1

Which statement correctly describes an endothermic chemical reaction?

The products have higher potential energy than the reactants, and ∆H > 0

The products have higher potential energy than the reactants, and ∆H < 0

The products have lower potential energy than the reactants, and ∆H < 0

The products have lower potential energy than the reactants, and ∆H > 0

2

What happens to the value of ∆H for a thermochemical reaction if the reaction is reversed?

∆H has the same numerical value, and the sign remains the same

∆H has the same numerical value, and the sign changes

∆H has a different numerical value, but the sign remains the same

∆H has different numerical value and sign

3

∆H = 114 kJ for the reaction: 2 NO2 (g) → 2 NO(g) + O2(g). What is the ∆H for NO(g) + ½ O2(g) → NO2(g)?

- 57 kJ

+ 57 kJ

- 114 kJ

+ 114 kJ

4

Which of the following does not have a standard heat of formation equal to 0 at 298 K and 1.0 atm?

H (g)

Ne (g)

N2 (g)

C (graphite)

5

The enthalpy of combustion of propane gas is – 2220.0 kJ.mol-1. Which statement is incorrect?

Propane releases heat as it burns

Combustion of propane is an exothermic process

ΔH0f (C3H8, g) = -2220.0 kJ.mol-1

The enthalpy change of the combustion of 2 moles is – 4440.0 kJ

6

If a reaction is carried out at constant pressure, which of the following statements is correct?

The reaction is likely to be exothermic

The reaction is likely to be endothermic

The heat change is equal to the change of temperature

The heat change is equal to the enthalpy change

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