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gavmur [86]
3 years ago
10

Which piece of evidence would prove that a reaction is exothermic?

Chemistry
2 answers:
SashulF [63]3 years ago
4 0
The reactants have more energy than the products. If a reaction is EXOthermic, it loses energy during the reaction, so the output (products) will have less energy than the input (reactants).
timofeeve [1]3 years ago
3 0

Answer: Option (c) is the correct answer.

Explanation:

In an exothermic reaction, excess of energy is released into the surroundings as a result there occurs decrease in the energy of products.

For example, A + B \rightarrow C + D + Heat is an exothermic reaction.

Whereas in an endothermic reaction, energy is absorbed by reactant molecules and therefore, energy of products is more than energy of reactants.

For example, A + B + Heat \rightarrow C + D is an endothermic reaction.

Thus, we can conclude that the reactants have more energy than the products is a piece of evidence that would prove that a reaction is exothermic.

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White phosphorus melts and then vaporizes at high temperatures. The gas effuses at a rate that is 0.404 times that of neon in th
Soloha48 [4]

White phosphorus melts and then vaporizes at high temperatures. The gas effuses at a rate that is 0.404 times that of neon in the same apparatus under the same conditions-There are 4 atoms of P in the molecule

Explanation:

Ar=30,97g/mol

R_{Px/R_Ne}=\sqrt{Mr(Ne)/Mr(Px)}=0,404

0,404=\sqrt{20,18/30,97*x}

0,404^{2}=20,18/30,97*x

X=20,18/30,97*0,163

X=4

There are 4 atoms of P in the molecule

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