Chem CH10

Question 1

Thermochemistry

Answer 1

energy changes in chemical reactions

Question 2

When heat goes into a system it is (+/-)

Answer 2

+

Question 3

When heat leaves a system and goes into surroundings it is (+/-)

Answer 3

-

Question 4

When work is done on the system it is (+/-)

Answer 4

+

Question 5

When work is done on the surroundings it is (+/-)

Answer 5

-

Question 6

1st law of thermodynamics

Answer 6

energy cannot be created or destroyed, only transferred

Question 7

Is pressure a state function?

Answer 7

yes

Question 8

is volume a state function?

Answer 8

yes

Question 9

is temperature a state function?

Answer 9

yes

Question 10

is work a state function

Answer 10

no

Question 11

is heat (q) a state function?

Answer 11

no

Question 12

Is enthalpy a state function?

Answer 12

yes

Question 13

Is internal energy a state function?

Answer 13

yes

Question 14

In a ______ system, no matter nor energy can be transferred from its system to surroundings

Answer 14

isolated

Question 15

In a ________ system, only energy can flow between system and surroundings

Answer 15

closed

Question 16

in a _____ system, energy and matter can flow freely between system and surroundings

Answer 16

open

Question 17

When energy flows from surroundings into its system (endo/exo)

Answer 17

endothermic

Question 18

when energy flows from its system into the surroundings (endo/exo)

Answer 18

exothermic

Question 19

Is endothermic reaction (+/-)

Answer 19

+

Question 20

When work is done by system on surroundings, are the moles of reactants (>/

Answer 20

< less than

Question 21

When work is done on the system by surroundings, are the moles of reactants (>/

Answer 21

> greater than

Question 22

Enthalpy of fusion is the energy required to change a sample from ______ to ______.

Answer 22

solid to liquid

Question 23

Enthalpy of Vaporization is the energy required to change a sample from _____ to _____.

Answer 23

liquid to gas

Question 24

Heat capacity of a substance is the energy required to…

Answer 24

raise the temperature by 1º C at constant pressure

Question 25

Calorimeter measures the quantity of energy…

Answer 25

transferred during a phase change or chemical reaction