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WorksheetsReaction Energy
Total questions: 20
Worksheet time: 12mins
Name
Class
Date
1.
Temperature is a measure of the...
a)
total energy in a substance
b)
total kinetic energy in a substance
c)
average potential energy in a substance
d)
average kinetic energy of molecules in a substance
2.
A substance with a high specific heat:
a)
Is always extremely hot.
b)
Requires a lot of energy to become hot.
c)
Is not heavy.
d)
Does not requires a lot of energy to become hot.
3.
The transfer of thermal energy between objects of different temperatures is called...
a)
temperature
b)
heat
c)
internal energy
d)
none of these
4.
What is the correct formula to convert Celsius to Kelvin?
a)
K=C-273
b)
K=C+273
c)
K=C-100
d)
K=C+100
5.
What quantity of heat is required to raise the temperature of 450 grams of water from 15°C to 85°C? The specific heat capacity of water is 4.18 J/g/°C.
a)
131670 J
b)
159885 J
c)
-131670
d)
none of the above
6.
The amount of heat required to raise the temperature of 1g of something by 1 C, is called what?
a)
Latent Heat
b)
Specific Heat
c)
Heat of Formation
d)
Heat of Fusion
7.
What is entropy?
a)
A measurement of chaos
b)
The heat content of a system
8.
Heat is measured in
a)
joules
b)
grams
c)
degrees celcius
9.
H2 + Cl2 --> 2 HCl + 1845 kJ
Is this reaction endothermic or exothermic?
Is this reaction endothermic or exothermic?
a)
Endothermic
b)
Exothermic
10.
Refer to the following question:
2N2 + 3H2 --> 2NH3 + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?
2N2 + 3H2 --> 2NH3 + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?
a)
92 kJ
b)
0.143 kJ
c)
23 kJ
d)
15 kJ
11.
Which phase of matter has the greatest motion and least orderly arrangement?
a)
solid
b)
liquid
c)
gas
12.
The equation that relates enthalpy, temperature and entropy is
a)
Hess's Law
b)
Second Law of Thermodynamics
c)
Gibbs Free Energy
d)
Calorimetry
13.
What is the formula to calculate heat energy required to raise the temperature of any substance?
a)
Q=m x ∆t x c
b)
Q=mc
c)
Q= ½mv
d)
m=QC
14.
If the enthalpy (ΔH) is negative, the reaction is ____.
a)
Endothermic
b)
Exothermic
c)
Neutral
15.
If ΔH is positive, heat energy would be shown on the _____ side of the equation.
a)
reactant
b)
product
16.
Where does the energy released in a chemical reaction come from?
a)
It is created.
b)
It comes from the kinetic energy of the moving particles.
c)
It comes from the potential energy stored in chemical bonds.
17.
Thermal energy always moves:
a)
From a high temperature object to a lower temperature object.
b)
From a lower temperature object to a higher temperature object.
c)
From an object with lower kinetic energy to an object with higher kinetic energy.
d)
From an object of higher mass to an object of lower mass.
18.
At the beach on a hot day, the reason the water feels cool compared to the hot sand is due to which property?
a)
Mass density
b)
Temperature
c)
Specific heat
d)
Thermal conductivity
19.
An ice cube feels cold in your hand because:
a)
your hand is an insulator
b)
heat flows from your hand to the ice cube
c)
cold flows from the ice cube to your hand
d)
there is friction between your hand and the ice cube
20.
Convert 35oC to ____ K
a)
95
b)
308
c)
-238
d)
1.66667
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