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3 years ago

In an exothermic reaction, the enthalpy change is negative. Which of the following is also true for an exothermic reaction?

2 answers:

7 0

The statement that is also true for an exothermic reaction would be that the products have a lower potential energy than the reactants.

lakkis [162]3 years ago

3 0

Answer: The correct statement is the products have a lower potential energy than the reactants.

Explanation:

Exothermic reactions are defined as the reactions in which the enthalpy change of a reaction is negative.

Enthalpy of a reaction is determined by the equation:

$\Delta H_{rxn}=\sum H_{products}-\sum H_{reactants}$

As, the enthalpy change of the reaction is negative, which means that the potential energy of the products is less than the potential energy of the reactants.

Hence, the correct statement is the products have a lower potential energy than the reactants.

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3 years ago

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svlad2 [7]

Answer:

The correct option is B) a gradual change of the traits of a species over time

Explanation:

The theory of natural selection explains the gradual changes which occur in the population of a species over time. According to natural selection, those organisms which are better adapted to live in an environment survive and pass on their traits to their offsprings. As a result, the traits of a species tend to change over time through the process of evolution. Evolutionary changes do not occur rapidly, instead, they can take many years to occur.

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3 years ago

Classify..use the periodic table to classify the elements potassium, bromine a d argon according to how likely their atoms lose

iren2701 [21]

Answer:

Classification will be Potassium, Bromine, and Argon

Explanation:

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Bromine actually gain electrons and forms negative ion
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3 years ago

Sodium has an atomic number of 11 and has a net charge of 0. When sodium combines with chlorine, it has a net charge of +1. Why?

Mamont248 [21]

Answer: Option (A) is the correct answer.

Explanation:

Atomic number of sodium is 11 and its electronic configuration is $1s^{2}2s^{2}2p^{6}3s^{1}$ .

In order to gain stability, sodium loses one electron and hence it forms a positive ion $(Na^{+})$ .

Thus, we can conclude that when sodium combines with chlorine, it has a net charge of +1 because sodium loses a negative electron when forming chemical bonds.

5 0

3 years ago

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