Chapter 5

Question 1

What is enthalpy?

Answer 1

Enthalpy is defined as the internal energy plus the product of pressure and volume. H = E + PV

Question 2

What is change in enthalpy?

Answer 2

ΔH = Δ(E+PV)

Question 3

What is enthalpy of reaction?

Answer 3

ΔH rxn = H products - H reactants

Question 4

What is heat capacity?

Answer 4

The amount of energy required to raise the temperature of a substance by 1k (1C) is its heat capacity.

Question 5

What is specific heat?

Answer 5

If the amount of the substance heated is one gram, it is the specific heat.

Question 6

What is the formula for specific heat?

Answer 6

ΔQ = mcΔT

Question 7

How to perform calorimetry calculations?

Answer 7

q = Cs x m soln x ΔT = -q rxn

Question 8

What is the SI unit of work or energy?

Answer 8

Joule

Question 9

How many joules in a kilojoule?

Answer 9

1,000 joules.

Question 10

What is Hess’ law?

Answer 10

If a reaction is carried out in a series of steps, ΔH for the overall reaction equals the sum of the enthalpy changes for the individual steps.