Module 1

Question 1

(Delta) H =

Answer 1

(Summation) Delta H_f (products) - (Summation) Delta Hf (Reactants)

Question 2

Hess’s Law

Answer 2

Enthalpy is a state function and is therefore independent of path.

Question 3

When you reverse a chemical equation,

Answer 3

you must change the sign of the equation’s Delta H.

Question 4

When you multiply a chemical equation by a number,

Answer 4

you must also multiply the Delta H of the equation by that same number.

Question 5

Percent Yield

Answer 5

The actual amount of product you make in a chemical reaction, divided by the amount stoichiometry indicates you should have made, times 100.