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WorksheetsThermochemistry Unit Review
Total questions: 20
Worksheet time: 10mins
How is energy represented in a thermochemical equation for an endothermic reaction? Select all that apply
On the reactant side
On the product side
ΔH is negative
ΔH is positive
endothermic
exothermic
decomposition
combustion
Which of the following correctly describes energy flow during an exothermic process?
From the system to the surroundings
From the surroundings to the system
From the reactants to the products
From the universe to the calorimeter
What does q stand for?
Heat-Joules
Mass-Grams
Specific Heat-J/g*C
Temperature Change-*C
What does c stand for?
Heat-Joules
Mass-Grams
Specific Heat-J/g*C
Temperature Change-*C
___________________ is the capacity to do work or supply heat.
energy
heat changes
specific heat
thermochemistry
What device is used to measure the amount of heat involved in a chemical reaction or physical process?
barometer
calorimeter
thermometer
The law of conservation of energy states that
in any chemical or physical change, energy cannot be created or destroyed, only changed in form.
heat changes occur during chemical and physical changes.
energy is the capacity to do work or to supply heat
there are two types of energy, kinetic and potential
The diagram represents two solids and the temperature of each. What occurs when the two solids are placed in contact with each other?
Heat energy flows from solid A to solid B. Solid A decreases in temperature
Heat energy flows from solid A to solid B. Solid A increases in temperature
Heat energy flows from solid B to solid A. Solid B decreases in temperature.
Heat energy flows from solid B to solid A. Solid B increases in temperature.
The graph represents the uniform heating of a substance, starting with the substance as a solid below its melting point. Which line segment listed below represents an increase in potential energy and no change in average kinetic energy?
Line segment AB
Line segment BC
Line segment CD
Line segment EF
Dissolving ammonium salt ( ΔHsoln=+ ) in water will cause a ___________ in temperature
increase
random change
drop
constant
What are the two main types of energy?
endothermic and exothermic
spontaneous and nonspontaneous
potential and kinetic
entropy and enthalpy
Which statements about Hess's law are correct?
I. It is an expression of the Law of Conservation of Energy
II. It can be used to indirectly determine the enthalpy of formation of a substance.
III. The sum of ΔH for individual steps is equal to ΔH for the overall reaction.
I and II only
I, II, and III
I and III only
II and III only
ΔHfo is zero for which types of substances?
elements
ionic compounds
gases
noble gases
