Thermochemistry

Question 1

Heat capacity

Answer 1

Amount of heat required to change object’s temperature by 1 degree

Question 2

Calorie

Answer 2

Amount of heat required to change temperature of 1g H2O by 1 degree

Question 3

1 kcal is equal to how many joules?

Answer 3

4186 J

Question 4

Specific heat

Answer 4

Amount of heat required to raise 1g of substance by 1 degree

Question 5

Specific heat equation

Answer 5

C = q/mΔT

Question 6

Heat

Answer 6

energy transferred from one object to another because of temperature difference

Question 7

Heat of fusion

Answer 7

Heat required to change 1g of substance from solid to liquid at melting point

Question 8

Heat of vaporization

Answer 8

Heat required to change 1g of substance from liquid to gas at boiling point

Question 9

Heat of solidification

Answer 9

Heat released when 1g of substance changes from liquid to solid

Question 10

Heat of condensation

Answer 10

Heat released when 1g of substance changes from gas to liquid

Question 11

Which heats are opposite of each other?

Answer 11

• Fusion + solidification

- Vaporization + condensation

Question 12

Calorimeter

Answer 12

Device used to measure amount of heat absorbed or released by process

Question 13

Calorimeter equation?

Answer 13

Heat lost = -heat gained

mCΔT = -mCΔT

Question 14

Enthalpy

Answer 14

Heat content of a system measured at a constant pressure

Question 15

Enthalpy change (heat of reaction) (ΔH)

Answer 15

Heat absorbed or released during chemical process

Question 16

Equation for enthalpy change

Answer 16

ΔH = ΔHproducts - ΔHreactants

Question 17

2 ways to calculate enthalpy change/heat of reaction/ΔH?

Answer 17

• Use standard heats of formation (WS)

- Hess’s law