Worksheetsheat and enthalpy
Total questions: 16
Worksheet time: 26mins
Name
Class
Date
1.
Temperature is a measure of average [blank] energy of individual atoms.
a)
heat
b)
potential
c)
mechanical
d)
kinetic
2.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
3.
Which phase of matter has the greatest motion and least orderly arrangement?
a)
solid
b)
liquid
c)
gas
4.
N2 + 3H2 −-> 2NH3
How many moles of ammonium are produced when 3 moles of nitrogen react with hydrogen?
How many moles of ammonium are produced when 3 moles of nitrogen react with hydrogen?
a)
6 moles Ammonium
b)
1.5 moles ammonium
c)
9 moles ammonium
d)
9 moles hydrogen
5.
_?_ 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
6.
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
7.
If 100 g of aluminum at 145ºC gains 6,800 J of heat, what is the final temperature (Tfinal) of the aluminum? Aluminum has a specific heat of 0.897 J/gºC. (Q=mcΔT)
a)
-69°C
b)
0.52°C
c)
221°C
8.
C+ O2 --> CO2 + 60kJ, what is the value for ΔH for the reaction?
a)
+60
b)
-60
c)
there is no way to know
9.
Specific heat capacity is
a)
heat energy needed to raise temp by 1C
b)
heat energy needed to raise temp of 1g of substance by 1C
c)
heat energy absorb to raise 1g of substance to higher temp
d)
heat energy need to raise temp for 1g of substance
10.
The amount of moving molecules an object/living thing has.
a)
Heat
b)
Temperature
c)
Thermal energy
d)
All of them
11.
A reaction that gives out energy to the surroundings causes the surroundings ....
a)
temperature to drop
b)
temperature to rise
c)
temperature to remain constant
d)
temperature to vary
12.
Endothermic reactions feel
a)
warm
b)
cold
13.
Which statement is true regarding endothermic reactions?
a)
a) Temperature change is positive and enthalpy change is positive
b)
b) Temperature change is positive and enthalpy change is negative
c)
c) Temperature change is negative and enthalpy change is positive
d)
d) Temperature change is negative and enthalpy change is negative
14.
A reaction that gives out energy to the surroundings causes the
a)
temperature to drop
b)
temperature to rise
c)
temperature to remain constant
d)
temperature to vary
15.
A reaction that causes the temperature of the surrounding to drop is
a)
endothermic
b)
exothermic
c)
displacement
d)
oxidation
16.
Energy in exothermic reactions are
a)
released
b)
absorbed
100 %
