WorksheetsThermochemistry Review
Total questions: 20
Worksheet time: 44mins
Name
Class
Date
1.
What type of reaction occurs in a hand warmer
a)
exothermic
b)
endothermic
2.
Exothermic reactions...
a)
Absorb energy
b)
Release energy
c)
Release Color
d)
Absorb Color
3.
In an endothermic reaction, heat is ...
a)
taken in or absorbed
b)
given out or released
4.
O2(g) + 2 H2 (g) → 2 H2O (g) + Energy
a)
endothermic
b)
exothermic
5.
6 CO2+ 6 H2O + Energy → C6H12O6 + 6 O2
a)
endothermic reaction
b)
exothermic reaction
6.
Describe the substance between letters C and D.
a)
Gas
b)
Liquid
c)
Melting
d)
Evaporating
7.
Between which points is the temperature of the substance remaining constant?
a)
A-B only.
b)
A-B, C-D, E-F
c)
B-C only.
d)
B-C, D-E
8.
True or false: melting and freezing occur at the same temperature.
a)
True
b)
False
9.
Describe what is happening between letters D and E.
a)
Gas
b)
Liquid
c)
Melting
d)
Evaporating
10.
Describe the substance between letters E and F.
a)
Gas
b)
Liquid
c)
Melting
d)
Evaporating
11.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
12.
How do you calculate Enthalpy of a reaction?
a)
ΔH = ΔHproducts - ΔHreactants
b)
ΔT = q / mC
c)
ΔG = ΔH -TΔS
d)
E = mc2
13.
The SI unit of heat and energy is the __________.
a)
calorie
b)
heat
c)
joule
d)
watt
14.
Temperature is a measure of average [blank] energy of individual atoms.
a)
heat
b)
potential
c)
mechanical
d)
kinetic
15.
_?_ is the amount of energy required to raise the temperature of 1 gram of any substance 1oC.
a)
Specific heat
b)
A calorie
c)
Thermal energy
d)
Conduction
16.
As 120 g of hot milk cools in a mug, it transfers 20, 000 J of heat to the environment. What is the temperature change of the milk? The specific heat of milk is 2.6 J/g·°C. (Q=mcΔT)
a)
64 °C
b)
1.56 °C
c)
640 °C
d)
cannot be determined
17.
How much heat does an aluminum block absorb if 10.00 grams ae heated from 25.0oC to 50.0oC? the specific heat of aluminum is 0.900J/goC
a)
450
b)
-450
c)
225
d)
-225
18.
_____ reactions usually feel hot!
a)
endothermic
b)
exothermic
19.
____ reactions usually feel cold.
a)
endothermic
b)
exothermic
20.
During an endothermic reaction in a beaker if we are part of the surroundings and touched the beaker, it would feel _______.
a)
Warm
b)
Cold
100 %
