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WorksheetsUnit 11 Thermochemistry Test REVIEW
Total questions: 20
Worksheet time: 12mins
The energy stored in chemical bonds is called _____ potential energy.
chemical
kinetic
potential
substantial
Using this equation:
ΔH = products - reactants
Calculate the enthalpy change if the enthalpy of the reactants is 59.0 and the enthalpy of the products is 140.0.
-81.0
81.0
199.0
0.421
The _____ is defined as the system along with the surroundings.
universe
surroundings
earth
system
Heat moves from ___ to ___.
freezing to warm
ice cold to molten lava hot
hot to cold
cold to hot
Using this equation:
ΔH = products - reactants
Calculate the enthalpy change if the enthalpy of the products is 143 kJ and the enthalpy of the reactants is -73 kJ.
216
-216
-73/143
70
When the change in enthalpy is positive, the reaction is (a) . When the change in enthalpy is negative, the reaction is (b) .
The temperature of a sample of a compound with a mass of 6.6 grams changed from 22 °C to 10 °C with the release of 325 J of energy. What is the specific heat of the compound?
4.10
-4.10
0.00169
-0.00169
How much heat is absorbed by 16.8 g of water when its temperature increased from 16.6 °C to 44.4°C? The specific heat of water is 4.184 J/g⁰C.
1954.1
-1954.1
111.63
-111.63
Exothermic reactions
gain heat; the products have more energy than the reactants
gain heat; the products have less energy than the reactants
lose heat; the products have more energy than the reactants
lose heat; the products have less energy than the reactants
When a nugget of pure gold is heated from 23.9°C to 729.9°C, it absorbed 3466 J of energy. The specific heat of gold is 0.129 J/g⁰C. Find the mass of the gold nugget.
38.06
-38.06
315662.48
-315662.48
ΔEuniverse=ΔEsystem+ΔEsurroundings=0
The expression above is a representation of the law of ____
definite composition
conservation of energy
multiple proportions
conservation of mass
Which enthalpy diagram shows that the reaction A2(g) + X2(g) --> 2AX(g) is an exothermic reaction that releases 550 kJ of heat?
What type of heat transfer is:
the only type of heat transfer that can happen through a vacuum
conduction
convection
radiation
What type of heat transfer is:
the heat transferred from the sun
conduction
convection
radiation
What type of heat transfer is:
heat transferred by electromagnetic radiation
conduction
convection
radiation
What type of heat transfer is:
frying bacon on a pan
conduction
convection
radiation
What type of heat transfer is:
heat transferred by the circulation of a fluid
conduction
convection
radiation
What type of heat transfer is:
heat transferred by touch
conduction
convection
radiation
What type of heat transfer is:
this type of heat transfer is found in oven that contain a fan that circulates the heat
conduction
convection
radiation
Label the diagram.
