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Heat Of Reaction + Entropy

Sonny Williams avatar Sonny Williams
25 July 2022
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24 test answers

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question
Which reaction represents the heat of reaction for a chemical reaction in terms of the potential energy of its products and reactants.
answer
PE of Products-PE of Reactants
question
Which reaction releases the egreatest amount of energy per 2 moles of product?
answer
4Al(s) + 3O2(g) --> 2Al2O3(s)
question
What is true about the reaction: N2(G) + 3H2(g) --> 2NH3(g) + 91.8kJ
answer
It is exothermic and its heat of reaction is -91.8kJ
question
Which phrase describes the reaction: 4Fe(s) + 3O2(g) --> 2Fe2O3(s) + 1640kJ
answer
Exothermic with a heat of reaction of -1640kJ
question
Which statement correctly describes an endothermic chemical reaction?
answer
The products have a higher potential energy than the reactants, and the heat of reaction is positive.
question
What is the approximate heat of reaction for the formation of 1 mole of H2O(l) in the given equation: 2H2(g) + O2(g)--> 2H2O(l) + 571.6kJ
answer
-285.8kJ
question
According to Table I, which salt releases energy as it dissolves?
answer
LiBr
question
Given the reaction: CH4(g) + 2O2(g) --> 2H2O(g) + CO2(g) What is the overall result when CH4 burns according to this reaction?
answer
Energy is absorbed and the heat of reaction is positive.
question
According to Reference Table I, which statement best describes the formation of HI(g)?
answer
It is endothermic, and heat is absorbed.
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Given the reaction: H2O(l) + 286kJ --> H2(g) + 1/2O2(g) Which statement describes the reverse reaction?
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It is exothermic and releases 286kJ
question
According to Reference Table I, which compound is formed from its elements during an exothermic reaction?
answer
CO2(g)
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According to Reference Table I, which gas is formed from its elements as a result of an endothermic reaction?
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NO2
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According to Reference Table I, when 2 moles of H2O(g) are formed from its elements,
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484kJ of heat is released
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According to Reference Table I, heat is liberated during the formation of the compund
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Water(g)
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What is Entropy?
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Measure of the disorder of a system
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As 1 gram of H2O(l) changes to 1 gram of H2O(s), the entropy of the system
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Decreases
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A 1 gram sample of a substance has the greatest entropy when it is in the
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Gaseous State
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As NaCl(s) dissolves according to the equation NaCl(s) --> Na+(aq) + Cl-(aq) the entropy of the system
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Increases
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Above 0 degrees Celsius, ice changes spontaneously to water according to the following equation: H2O(s) + heat --> H2O(l) The changes in H2O(s) involve:
answer
An absorption of heat and a decrease in entropy.
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Which type of reaction is the haber process N2(g) + 3H2(g) --> 2NH3(g) + heat?
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Exothermic, with a decrease in entropy
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Which 1-mole sample has the least entropy?
answer
Br2(s) at 266K
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In terms of energy and entropy, systems in nature tend to undergo changes toward
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Lower energy and higher entropy
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Why is entropy increasing in this reaction: CaCO3(s) --> CaO(s) + CO2(g)
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Particles are becoming more disordered
question
Why does the entropy of water decrease when water freezes?
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It becomes more organized and less disordered.