Chem Ch. 17

Question 1

Exothermic Process

Answer 1

A process that loses heat to surroundings

Question 2

Endothermic process

Answer 2

A process that absorbs heat from the surroundings

Question 3

System

Answer 3

the part of the universe being studied

Question 4

Heat capacity

Answer 4

The amount of heat required to change the temperature of an object exactly 1 degree celsius

Question 5

Enthalpy (H)

Answer 5

the amount of heat that a system has at a constant pressure

Question 6

Heat of combustion

Answer 6

The heat of reaction for the complete burning of 1 mole of substance

Question 7

Calorimetry

Answer 7

The measurement of heat changes for chemical/physical processes

Question 8

Molar heat of: fusion / solidification / vaporization / solution

Answer 8

1. Fusion: the heat absorbed by 1 mol of a substance in melting
2. Solidification: The heat lost when 1 mol of a liquid solidifies at a constant temperature
3. Vaporization: The amount of heat necessary to vaporize 1 mol of liquid
4. Solution: the heat change caused by dissolving 1 mol of substance

Question 9

ΔHvap = ?

Answer 9

ΔHvap = -ΔHcond

Question 10

Standard heat of formation

Answer 10

The change in enthalpy that accompanies the formation of 1 mole of a compound from its elements

Question 11

Hess’s Law of Heat Summation

Answer 11

In a specific chemical reaction, the enthalpy change is the same whether the reaction takes place in one step or in a series of steps

Question 12

Symbol for standard heat of formation

Answer 12

ΔH0/f

Question 13

ΔH0

Answer 13

Sum of products - sum of reactants