
Thermochemistry Practice
Authored by Lisa Thompson
Science
10th Grade
NGSS covered

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15 questions
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1.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
Calculate the enthalpy of the following reaction:
Ca(OH)2 -> CaO + H2O
ΔHf in kJ/mol:
Ca(OH)2 -983.2
CaO -634.9
H2O -285.5
62.8 kJ
-62.8 kJ
-1840.6
1840.6
Tags
NGSS.HS-PS1-4
2.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
In an endothermic reaction, the sum of the heats of formation of the products are____than the sum of the heats of formation of the reactants. Hint: is ΔH + or -? This about how you calculate ΔH
less than
greater than
equal to
3.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
When heat flows from system to the surroundings that is an example of an ________________ process.
exothermic
endothermic
Tags
NGSS.HS-PS3-4
4.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
What device is used to measure the amount of heat involved in a chemical reaction or physical process?
barometer
calorimeter
thermometer
5.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
2N2 + 3H2 --> 2NH3 + 46 kJ
How much energy would be produced if only 1 mol of nitrogen was reacted?
92 kJ
0.143 kJ
23 kJ
15 kJ
Tags
NGSS.HS-PS3-1
6.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
How much energy must be used to produce 4.75 mol of gaseous water?
H2O (l) + 44.0 kJ --> H2O (g)
207 kJ
9.36 kJ
206.8 kJ
9.362 kJ
Tags
NGSS.HS-PS1-4
NGSS.HS-PS3-1
7.
MULTIPLE CHOICE QUESTION
1 min • 1 pt
4 PCl5 + 3438 kJ --> P4 + 10 Cl2
How much energy is required to produce each mole of chlorine?
687.6 kJ
859.5 kJ
343.8 kJ
245.8 kJ
Tags
NGSS.HS-PS1-4
NGSS.HS-PS3-1
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