Unit 13

Question 1

In a chemical equation where is the potential energy

Answer 1

In the bonds of the molecules of the reactants

Question 2

In a chemical equation where is the kinetic energy

Answer 2

In the heat released or absorbed

Question 3

Why is hess’s law a more exact way of determining delta H than using bond energies

Answer 3

Because it is more precise

Question 4

What is a state function

Answer 4

In a state function the final value is the only thing that matters not how you get there

Question 5

What substances have a delta Hf of 0

Answer 5

Elements that are in their standard form

Question 6

What should you do to the temperature of an object to increase it’s entropy

Answer 6

Increase the temperature

Question 7

How do you determine the sign of delta S

Answer 7

The side of the equation that has the most molecules in the gas phase has the highest delta S

Question 8

What causes a reaction to be spontaneous

Answer 8

If delta G is negative then the reaction is spontaneous

Question 9

Is it possible for a reaction to occur if the reaction decreases the entropy of the chemicals involved

Answer 9

Yes as long as the reaction increases the entropy of the matter around it more than it decreased the chemicals in the reaction