chapter 17

Question 1

Heat

Answer 1

Energy that transfers from one object to another because of a temp. difference between them

Question 2

exothermic process

Answer 2

a process that loses heat to the surroundings

Question 3

heat capacity

Answer 3

the amount of heat required to change the temp of an object by exactly 1 degree C

Question 4

system

Answer 4

the part of the universe being studied

Question 5

endothermic process

Answer 5

a process that loses heat to its surroundings

Question 6

enthalpy (H)

Answer 6

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

Question 7

heat of combustion

Answer 7

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

Question 8

thermochemical equation

Answer 8

includes the enthalpy change

Question 9

calorimetry

Answer 9

accurate and precise measurement of heat changes for chemical and physical processes

Question 10

bomb calorimeter

Answer 10

insulated device containing sealed vessel that is used to measure the heat released during a combustion reaction

Question 11

molar heat of fusion

Answer 11

heat absorbed by 1 mole of a substance in melting from a solid to a liquid

Question 12

molar heat of solidification

Answer 12

heat lost when 1 mole of a liquid solidifies at a constant temperature

Question 13

molar heat of vaporization

Answer 13

amount of heat necessary to vaporize 1 mole of a liquid

Question 14

∆Hvap

Answer 14

-∆Hcond

Question 15

molar heat of solution

Answer 15

the heat change caused by dissolution of 1 mole of solution

Question 16

standard heat of formation

Answer 16

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

Question 17

Hess’s law of heat summation

Answer 17

in going from a particular set of reactants to a particular set of products, the enthalpy change is the same whether the reaction takes place in one step or series of steps

Question 18

ΔH f

Answer 18

symbol for the standard heat of formation

Question 19

zero

Answer 19

ΔH f of Cl2 g)

Question 20

during which change is energy absorbed

Answer 20

the melting of ice