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WorksheetsEnergy Test review
Total questions: 17
Worksheet time: 9mins
Name
Class
Date
1.
The law of conservation of energy states that energy can be created or destroyed.
a)
True
b)
False
2.
The symbol "h" is used to represent heat.
a)
True
b)
False
3.
Chemical potential energy is stored in the chemical bonds of a substance.
a)
True
b)
False
4.
The equation given below is a thermochemical equation:
4Fe(s) + 3O2(g) --> 2Fe2O3(s) ΔH = –1651 kJ
4Fe(s) + 3O2(g) --> 2Fe2O3(s) ΔH = –1651 kJ
a)
True
b)
False
5.
Enthalpy is the heat content of a system.
a)
True
b)
False
6.
An exothermic reaction
a)
releases heat
b)
absorbs heat
c)
disperses heat
d)
destroys enthalpy
7.
Which of these is needed to calculate the amount of heat (q)?
a)
moles
b)
heat
c)
specific heat
d)
state of matter
8.
Which of the following represents an endothermic process?
a)
water solidifying
b)
steam condensing
c)
wood combusting
d)
ice melting
9.
Which of the following describes an endothermic process?
a)
-ΔH
b)
+ΔH
c)
there is no change in enthalpy
d)
the products have less enthalpy (H) than the reactants
10.
If a process or reaction has a ΔH of -250 kJ, which of the following is true?
a)
The reactants have 250 kJ more energy than the products.
b)
The products have 250 kJ more energy than the reactants.
c)
It is an endothermic reaction.
d)
The reactants dissipate energy.
11.
What does ΔH stand for?
a)
change in temperature
b)
change in mass
c)
change in enthalpy
12.
The standard enthalpy of formation is the change in enthalpy that results from the formation of one mole of a compound.
a)
True
b)
False
13.
Hess's Law states that if two or more thermochemical equations can be added to produce a final equation for a reaction, then you can _____________ the enthalpy changes of each reaction.
a)
multiply
b)
divide
c)
subtract
d)
add
14.
ΔHf
a)
enthalpy of formation
b)
enthalpy of combustion
c)
enthalpy of reaction
d)
enthalpy of vaporization/boiling
15.
ΔHrxn
a)
enthalpy of formation
b)
enthalpy of combustion
c)
enthalpy of reaction
d)
enthalpy of vaporization/boiling
16.
ΔHcomb
a)
enthalpy of formation
b)
enthalpy of combustion
c)
enthalpy of reaction
d)
enthalpy of vaporization/boiling
17.
ΔHfus
a)
enthalpy of melting
b)
enthalpy of freezing
c)
enthalpy of condensation
d)
enthalpy of combustion
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