chapter 6-heat chemistry

Question 1

Work equation

Answer 1

W= -P(change in volume)
W=force x distance

Question 2

When work is negative

Answer 2

when work is done by the system

-if the surroundings were a gas, then the surroundings shall expand. expansion

Question 3

when work is positive

Answer 3

when work is done on the system

• compression

Question 4

Work and heat are process quantities

True or False?

Answer 4

True

Question 5

what are the three types of systems?

Answer 5

Open- can exchange energy and matter
Closed- can exchange energy but not matter
Isolated- cannot transfer energy or matter

Question 6

(delta)H= (delta)U + W

Answer 6

At constant pressure, heat of rxn

Question 7

(delta)H= (delta)E + P(delta)V

Answer 7

Heat of reaction equation

Question 8

units of Joules

Answer 8

1000 cal= 1 kcal = 1 Cal = 4.184J

Question 9

heat of reaction equation

Answer 9

(Sum of Products) - (Sum of reactants)

Question 10

calorimeter equation

Answer 10

q= mC(delta)T

at constant pressure

Question 11

enthalpy change based on bond energies

Answer 11

(sum of bonds broken) + (- sum of bonds formed)