chapter 17

Question 1

heat

Answer 1

energy that transfers from one object to another because of a temperature differnce between them

Question 2

heat always flows from

Answer 2

a warmer object to a cooler one

Question 3

thermochemistry

Answer 3

study of energy chances that occur during the chemical reactions and changes in state

Question 4

chemical potential energy

Answer 4

the neergy stored in the chemical bonds of a substance

Question 5

endothermic process

Answer 5

system gains heat as the surroundings cool down

Question 6

exothermic process

Answer 6

the system loses heat as the surroundings heat up

Question 7

system

Answer 7

the part of the universe on which you focus your attention

Question 8

surroundings

Answer 8

include everything else in the universe, usually water

Question 9

in an endothermic reaction, heat is a

Answer 9

reactant

Question 10

in an exothermic reaction, heat is a

Answer 10

product

Question 11

1 cal =

Answer 11

4.18 J

Question 12

heat capacity

Answer 12

amount of heat needed to increase the temperature of an object exactly 1 degree celcius

Question 13

specific heat

Answer 13

the amount of heat it takes to raise the temp of 1g of a substance 1 degree Celsius

Question 14

specific heat of water

Answer 14

4.18

Question 15

equation for specific heat

Answer 15

C = joules / mass (g) x delta T

Question 16

calorimetry

Answer 16

precise measurement of the heat flow into or out of a system for chemical and physical processes

Question 17

equation for calorimetry

Answer 17

-q = -(mass x specific heat x delta T)

Question 18

enthalpy

Answer 18

the heat content of a system at contstant pressure

Question 19

thermochemical equation

Answer 19

chemical equation that includes the enthalpy change

Question 20

heat of reaction

Answer 20

enthalpy change for the chemical equation exactly how it is written

Question 21

heat of combustion

Answer 21

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

Question 22

molar heat of fusion

Answer 22

heat sborbed by one mole of a solid substance as if melts to a liquid

Question 23

molar heat of solidification

Answer 23

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

Question 24

hess’ law

Answer 24

you can add the heats of reaction if you add two or more thermochemical equations

Question 25

standard heat of formation

Answer 25

change in ethalpy that accompanies the formation of one mole of a compound from its elements