Thermochemistry MCQs
Thermochemistry MCQs
Answer these Thermochemistry MCQs and assess your grip on the subject of Thermochemistry. Scroll below and get started!
1: When a system ________, Δe is always negative.
A. Absorbs heat and does work
B. Gives off heat and does work
C. Absorbs heat and has work done on it
D. Gives off heat and has work done on it
E. None of the above is always negative.
2: The chemical reaction illustrated in the accompanying figure _____.
A. Links two polymers to form a monomer
B. Joins two fatty acids together
C. Is a hydrolysis reaction
D. Results in a peptide bond
3: What is thermochemistry?
A. The study of heat transfer in chemical reactions
B. The study of energy changes in chemical reactions
C. The study of the behavior of gases at high temperatures
D. The study of the properties and behavior of substances at low temperatures
4: Which of the following is a state function in thermochemistry?
A. Heat transfer
B. Enthalpy
C. Temperature change
D. Heat capacity
5: What is enthalpy?
A. The heat absorbed or released during a chemical reaction
B. The total energy of a system
C. The average kinetic energy of particles in a substance
D. The resistance of a substance to temperature change
6: What is an exothermic reaction?
A. A reaction that absorbs heat from the surroundings
B. A reaction that releases heat to the surroundings
C. A reaction that occurs at low temperatures
D. A reaction that requires an input of energy to proceed
7: What is the standard enthalpy of formation?
A. The enthalpy change when one mole of a compound is formed from its constituent elements in their standard states
B. The enthalpy change when a substance undergoes a phase change
C. The enthalpy change when a reactant is completely converted to products
D. The enthalpy change when a substance absorbs or releases heat
8: What is Hess's law?
A. The law that states energy cannot be created or destroyed, only converted from one form to another
B. The law that states the total enthalpy change in a chemical reaction is independent of the pathway taken
C. The law that states the rate of a chemical reaction is directly proportional to the concentration of reactants
D. The law that states the pressure of a gas is inversely proportional to its volume at constant temperature
9: What is the heat capacity of a substance?
A. The amount of heat required to raise the temperature of the substance by one degree Celsius
B. The amount of heat required to change the phase of the substance
C. The amount of heat absorbed or released during a chemical reaction
D. The amount of heat required to convert the substance from a solid to a liquid
10: What is an endothermic reaction?
A. A reaction that absorbs heat from the surroundings
B. A reaction that releases heat to the surroundings
C. A reaction that occurs at high temperatures
D. A reaction that requires an input of energy to proceed
11: What is the specific heat capacity of a substance?
A. The amount of heat required to raise the temperature of one gram of the substance by one degree Celsius
B. The amount of heat required to change the phase of the substance
C. The amount of heat absorbed or released during a chemical reaction
D. The amount of heat required to convert the substance from a solid to a liquid
12: What is the enthalpy change for a chemical reaction at constant pressure called?
A. Heat of formation
B. Heat of reaction
C. Enthalpy of reaction
D. Enthalpy of fusion
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Thermochemistry MCQs
