Test 4 Review

Question 1

stored energy

Answer 1

potential energy

Question 2

feels hot

Answer 2

exothermic

Question 3

releases heat

Answer 3

exothermic

Question 4

delta H is positive

Answer 4

endothermic

Question 5

absorbs heat

Answer 5

endothermic

Question 6

feels cold

Answer 6

endothermic

Question 7

reactants have heat

Answer 7

endothermic

Question 8

heat is a product

Answer 8

exothermic

Question 9

delta H is negative

Answer 9

exothermic

Question 10

delta E symbolizes

Answer 10

internal energy

Question 11

amount of heat required to melt 1 g of substance

Answer 11

heat of fusion

Question 12

has more energy: boiling water v steam

Answer 12

steam

Question 13

change in internal energy equation

Answer 13

delta E = Q + W (1st law of thermodynamics)

Question 14

1 cal =

Answer 14

4.184 J

Question 15

when work is done on system

Answer 15

positive

Question 16

when entropy decreases

Answer 16

negative

Question 17

gain in heat

Answer 17

positive

Question 18

work is done by the system

Answer 18

negative

Question 19

increase in entropy

Answer 19

negative

Question 20

gain in heat

Answer 20

positive

Question 21

under spontaneous conditions, if +delta S, then delta H is

Answer 21

negative (exothermic reaction)

Question 22

enthalpy equation

Answer 22

delta H= delta E + PV

Question 23

heat absorbed or released equation

Answer 23

Q = mc delta T

Question 24

total amount of heat liberated from start of reaction to end

Answer 24

heat of reaction

Question 25

has the word “heat” in the equation; look for delta H

Answer 25

thermochemical equation

Question 26

released in crystallization; absorbed in fusion

Answer 26

heat

Question 27

enthalpy of formation for any element in standard state

Answer 27

0 (zero)

Question 28

amount of heat needed to vaporize

Answer 28

heat of vaporization

Question 29

has the greatest entropy

Answer 29

gas

Question 30

measure of disorder

Answer 30

entropy (2nd law of thermodynamics)

Question 31

if when solving for delta H in a thermochemical equation and the answer is positive, the reaction is _________ and the word “heat” goes on the ________ side

Answer 31

endothermic
reactant