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Study Quiz 2
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1
Which of the following symbols represents the enthalpy change for the phase change from liquid to gas?
A)∆Hfre
B)∆Hvap
C)∆Hmelt
D)∆Hcond
2
Which of the following phase changes is associated with the enthalpy of melting?
A)Liquid to gas
B)Liquid to solid
C)Solid to liquid
D)Gas to liquid
3
Which of the following statements are true?
I. The reaction vessel cools when an endothermic reaction occurs.
II. An endothermic reaction has a negative value of ∆H.
III. Heat is liberated when an exothermic reaction occurs.
A)I and II
B)I, II, and III
C)I and III
D)II and III
4
Which of the following processes are exothermic?
I. boiling water
II. freezing water
III. condensing steam
IV. melting ice
A)I and II
B)I and III
C)I and IV
D)II, III, and IV
5
Which of the following is true?
A)The standard enthalpy of reaction is the enthalpy change of a chemical reaction at 0°C and 100 kPa.
B)The standard enthalpy of reaction is the enthalpy change of a chemical reaction at 0°C and 0 kPa.
C)The standard enthalpy of reaction is the enthalpy change of a chemical reaction at 100°C and 25 kPa.
D)The standard enthalpy of reaction is the enthalpy change of a chemical reaction at 25°C and 100 kPa.
6
Which of the following is not true?
A)Using a catalyst in a reaction affects the enthalpy change of the reaction.
B)Using a catalyst in a reaction does not affect the enthalpy change of the reaction.
C)The standard molar enthalpy of formation is the quantity of energy that is absorbed or released when one mole of a compound is formed directly from its elements in their standard states.
D)The standard molar enthalpy of liquid water is different than the standard molar enthalpy of gaseous water.
7
When one mol of a solute dissolves in a solvent,
A)the enthalpy change is always endothermic
B)the enthalpy change can be endothermic or exothermic
C)the enthalpy change is always exothermic
D)a chemical change occurs
8
An instant cold pack works by which process?
A)Exothermic dissolution
B)Endothermic dissolution
C)Sublimation
D)Oxidation





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