by Corrianne Fairbanks
Thermochemistry delves into the intricate dance between heat and chemical reactions, offering insights into energy transformations that power everything from simple reactions to industrial processes. This quiz will challenge your understanding of key concepts, definitions, and applications within this fascinating field. Get ready to heat up your knowledge and see how well you can navigate the thermochemical landscape!
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Thermochemistry Quiz Questions Overview
1. What is the definition of enthalpy?
The measure of disorder in a system
The total heat content of a system
The energy required to break a bond
The energy released during a reaction
2. Which of the following is a state function?
Work
Heat
Enthalpy
Power
3. What is Hess’s Law?
The total enthalpy change of a reaction is the same, regardless of the number of steps in the reaction
Energy cannot be created or destroyed
The entropy of the universe always increases
The heat of reaction is independent of the pathway taken
4. What is the standard enthalpy of formation?
The enthalpy change when one mole of a compound is formed from its elements in their standard states
The enthalpy change when one mole of a compound is dissolved in water
The enthalpy change when one mole of a compound is burned in oxygen
The enthalpy change when one mole of a compound is broken down into its elements
5. What is the unit of enthalpy?
Joules (J)
Watts (W)
Kelvin (K)
Moles (mol)
6. Which of the following reactions is exothermic?
Melting of ice
Combustion of methane
Evaporation of water
Photosynthesis
7. What does a positive ΔH indicate about a reaction?
The reaction is exothermic
The reaction is endothermic
The reaction is spontaneous
The reaction is at equilibrium
8. What is the first law of thermodynamics?
Energy cannot be created or destroyed, only transformed
The entropy of the universe always increases
The total enthalpy change of a reaction is the same, regardless of the number of steps
The energy required to break a bond
9. What is the specific heat capacity?
The heat required to change the state of a substance
The heat required to raise the temperature of one gram of a substance by one degree Celsius
The heat required to break a chemical bond
The heat released during a chemical reaction
10. What is calorimetry used for?
Measuring the amount of heat absorbed or released during a chemical reaction
Measuring the pressure of a gas
Measuring the volume of a liquid
Measuring the concentration of a solution
11. What is the enthalpy change for a reaction called when it occurs at constant pressure?
Heat of reaction
Work done
Internal energy change
Gibbs free energy change
12. What is the term for the amount of heat required to convert a solid into a liquid without changing its temperature?
Heat of fusion
Heat of vaporization
Heat of combustion
Heat of formation
13. What is the symbol for Gibbs free energy?
H
G
S
U
14. Which of the following statements is true about an endothermic reaction?
It releases heat to the surroundings
It absorbs heat from the surroundings
It occurs spontaneously
It has a negative ΔH
15. What is the enthalpy change when one mole of a substance is burned in excess oxygen?
Heat of fusion
Heat of vaporization
Heat of combustion
Heat of formation
16. What does a negative ΔG indicate about a reaction?
The reaction is non-spontaneous
The reaction is at equilibrium
The reaction is spontaneous
The reaction is endothermic
17. What is the term for the amount of heat required to convert a liquid into a gas without changing its temperature?
Heat of fusion
Heat of vaporization
Heat of combustion
Heat of formation
18. What is the relationship between enthalpy (H), internal energy (U), pressure (P), and volume (V)?
H = U + PV
H = U – PV
H = U + P/V
H = U – P/V
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