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WorksheetsChemistry CH 10: Causes of Change
Total questions: 17
Worksheet time: 7mins
Name
Class
Date
1.
Enthalpy is the
a)
heat of formation at constant pressure
b)
heat of combustion at constant pressure
c)
energy of a system at constant pressure
2.
The greek letter Δ stands for
a)
heat stored in
b)
mass of
c)
rate of
d)
change in
3.
Which of the following is a measure of the average KE of the particles in a sample of matter?
a)
chemical kinetics
b)
thermochemistry
c)
reaction rate
d)
temperature
4.
How is celsius temperature converted to Kelvins?
a)
add 273
b)
subtracting 273
c)
divide by 273
d)
multiply by 273
5.
In the expression q=ncΔT, what do q and n represent?
a)
heat and the number of particles
b)
heat and moles of particles
c)
heat capacity and moles of particles
d)
enthalpy and moles of partilces
6.
The greater the KE of the particles in a sample of matter,
a)
the higher the temperature
b)
the lower the temperature
c)
the more heat a sample will absorb
7.
The study of all energy changes is called
a)
thermodynamics
b)
enthalpy
c)
entropy
d)
temperature
8.
What is the standard thermodynamic temperature?
a)
25K
b)
25⁰C
c)
-24.2J/mol
d)
-484J/K*mol
9.
In a calorimeter, the energy content of a substance is calculated from measurement of the temperature change in a known mass of
a)
iron
b)
air
c)
water
d)
steel
10.
For an exothermic reaction, the products
a)
are at the same energy level as the reactants
b)
have no energy
c)
are at a lower energy level than the reactants
d)
are at a higher energy level than the reactants
11.
Compounds whose enthalpies of formation are highly negative
a)
do not exist
b)
are very unstable
c)
are somewhat stable
d)
are very stable
12.
Which of the following is a measure of the disorder in a system?
a)
entropy
b)
enthalpy
c)
kinetic energy
d)
temperature
13.
Entropy decreases as a result of
a)
a decrease in pressure
b)
a decrease in temperaure
c)
agitation
d)
an increase in temperature
14.
This is an expression of ____.
ΔS-TΔH
ΔS-TΔH
a)
Gibbs Energy
b)
Entropy
c)
Enthalpy
d)
Kinetic energy
15.
Entropy acts more in determining Gibbs energy of reaction that take place at
a)
high temperatures
b)
low temperatures
c)
high pressures
d)
low pressures
16.
Which depends only on teh initial and final states of a reaction, rather than on the intermediate process?
a)
ΔH only
b)
ΔS only
c)
Both ΔH and ΔS
d)
TΔS
17.
A reaction occurs spontaneously when ΔG is
a)
positive
b)
negative
c)
zero
d)
constant
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