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WorksheetsEnthalpy Changes
Total questions: 10
Worksheet time: 45mins
Name
Class
Date
1.
The SI unit of heat and energy is the __________.
a)
calorie
b)
heat
c)
joule
d)
watt
2.
Temperature is a measure of average [blank] energy of individual atoms.
a)
heat
b)
potential
c)
mechanical
d)
kinetic
3.
ΔH value in an endothermic reaction is a positive number.
a)
True
b)
False
4.
For which of these processes is the value of ΔH expected to be positive?
1. The temperature increases when calcium chloride dissolves in water.
2. Steam condenses to liquid water
3. Water boils
4. Dry ice sublimates
1. The temperature increases when calcium chloride dissolves in water.
2. Steam condenses to liquid water
3. Water boils
4. Dry ice sublimates
a)
4 only
b)
1 only
c)
3 and 4 only
d)
2 and 3 only
5.
The diagram represents which type of reaction
a)
endothermic
b)
exothermic
6.
_?_ 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
7.
Chemical reactions that absorb energy are called
a)
endothermic
b)
fast
c)
slow
d)
exothermic
8.
Define 'Enthalpy'
a)
a) Energy stored in the movement of molecules in a substance
b)
b) The opposite of temperature
c)
c) The temperature of a molecule
d)
d) Energy stored in the chemical bonds in a substance
9.
What would be the effect on the particles if more heat is supplied to the system?
a)
They would slow down
b)
They would stop moving
c)
They would speed up
d)
There would be no effect
10.
What is a tool that measures the heat of chemical reactions?
a)
calorimeter
b)
calorie
c)
Styrofoam™ cup
d)
none of these
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