Which of the following statements is false? A. Heat can be considered a reactant in all...
Which of the following statements is false?
A. Heat can be considered a reactant in all endothermic reactions.
B. The reaction 2A(s) + B(g) → 2C(g) would have a negative work term.
C. A result of the First Law of Thermodynamics is that ΔEuniverse= 0 kJ.
D. A negative ΔE for a reaction means that energy flows out of the surroundings and into the system.
Homework Answers
Answer: D
Explanation:
A. In all endothermic reaction heat is consumed, so heat is a reactant for endothermic processes. But in exothermic reactions heat is released and is considered a product.
Hence option A is a correct statement.
B. The term 
ng for this reaction is (2-3)= -1 which is given by
subtracting the number of gaseous molecules on reactant side from
the number of molecules on product side. W= PV
=
ngRT. So, work term for the given reaction is
negative.
So this is also a true statement.
C. First law of thermodynamics states that, energy is conserved; it can be neither created nor destroyed.
So, 
Euniv =
Esys +
Esurr = 0 and
this option is also a true statement.
D. A negative
E for a reaction implies that the reaction is exothermic and hence
releases energy into the surroundings. In this type of reactions,
energy flows out of the system and into the surroundings.
So, this option is a false statement and the answer to the given question.
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