(a)
Interpretation:
The process is to classified as exothermic or endothermic.
Concept Introduction:
Reactions that absorb heat are referred to as endothermic reactions. The enthalpy change for the endothermic reaction is positive.
Reactions that release heat are known as exothermic reactions. The enthalpy change for the endothermic reaction is negative.
(a)
Answer to Problem 48A
Condensing steam is an exothermic process.
Explanation of Solution
Condensation is the change of
The energy must be released by the gas to convert into a less random state called a liquid state. Thus, condensation is an exothermic process.
(b)
Interpretation:
The process is to classified as exothermic or endothermic.
Concept Introduction:
Reactions that absorb heat are referred to as endothermic reactions. The enthalpy change for the endothermic reaction is positive.
Reactions that release heat are known as exothermic reactions. The enthalpy change for the endothermic reaction is negative.
(b)
Answer to Problem 48A
Evaporating alcohol is an endothermic process.
Explanation of Solution
Evaporation is the change of state of matter from the liquid state to the gaseous state.
The energy must be absorbed by the liquid molecules to break the intermolecular forces and convert them into a more random gaseous state.
(c)
Interpretation:
The process is to classified as exothermic or endothermic.
Concept Introduction: Reactions that absorb heat are referred to as endothermic reactions. The enthalpy change for the endothermic reaction is positive.
Reactions that release heat are known as exothermic reactions. The enthalpy change for the endothermic reaction is negative.
(c)
Answer to Problem 48A
Burning of alcohol is an exothermic process.
Explanation of Solution
Burning of alcohol is a combustion reaction where alcohol reacts in the presence of oxygen to liberate heat. Thus, it is an exothermic process:
(d)
Interpretation:
The process is to classified as exothermic or endothermic.
Concept Introduction:
Reactions that absorb heat are referred to as endothermic reactions. The enthalpy change for the endothermic reaction is positive.
Reactions that release heat are known as exothermic reactions. The enthalpy change for the endothermic reaction is negative.
(d)
Answer to Problem 48A
The baking of potatoes is an endothermic process.
Explanation of Solution
Baking of potato involves the absorption of heat from the oven to cook the potato and thus, baking of potato is an endothermic process.
Chapter 17 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
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