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WorksheetsHeat Energy Exam # 6- Study Guide
Total questions: 13
Worksheet time: 8mins
Analyze the diagram.
Which statement best explains why the reaction in the diagram is exothermic?
The potential energy of the reactants is more than the potential energy of the products.
Potential energy is not conserved.
More heat is absorbed in the reaction.
The potential energy of the reactants is less than the potential energy of the products.
Analyze the diagram.
What is the potential energy value of the reactants?
150 kJ
50 kJ
350 kJ
200 kJ
Analyze the diagram.
Using ΔH = ΔHproducts - ΔHreactants, calculate the Heat of Reaction (ΔH).
+ 50 kJ
+ 150 kJ
- 50 kJ
- 150 kJ
What does the Law of Conservation of Energy state?
Energy cannot be transferred from one object to another object.
Energy can be created or destroyed, but it cannot be transformed from one form to another.
Energy can be created or destroyed.
Energy cannot be created or destroyed, but it can be transformed from one form to another.
A change occurs that raises the temperature of the container in which it happens. What is the best term to describe the change. (The container is the surroundings and the metal is the system.)
condensation
endothermic
exothermic
mechanical
During an exothermic change, energy is ________ which _________ the surroundings.
absorbed, cools
absorbed, warms
released, cools
released, warms
During an endothermic change, energy is ________ which _________ the surroundings.
absorbed, cools
absorbed, warms
released, cools
released, warms
The first law of thermodynamics, or the law of conservation of energy, states that energy is neither __________ nor destroyed. Therefore, the energy absorbed must the ____________ the energy released during these changes.
created, equal to
created, greater than
created, less than
transformed, less than
transformed, equal to
Analyze the graph.
Between which points is heat energy released?
E to F
B to C
E to D
D to E
Analyze the graph.
What phase change occurs from point B to point C?
sublimiation
melting
freezing
evaporation
Analyze the picture.
In which state do molecules have the highest kinetic energy?
ion
solid
gas
liquid
A substance in solid-state has just reached its phase change temperature. Based on the graph, what effect does additional thermal energy have on this substance?
Additional thermal energy increases the kinetic energy of the substance's particles.
Additional thermal energy breaks bonds holding substance's particles together.
Additional thermal energy changes the substance's phase with characteristic temperature increase.
Additional thermal energy does not affect the substance.
Water has a specific heat of 4.184 J/g˚C.
Using Q = mcΔT, how much energy is released from 300 g of water when its temperature is decreased from 20˚C to 4˚C?
-5,026 J
-1,150 J
-20,083 J
-25,081 J
