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zhenek [66]
2 years ago
5

which quantity will always have a negative value? A) the total bond energy of the reactants in an endothermic reaction. B) the c

hange in energy in a system during an endothermic reaction. C) the change in energy in a system during an exothermic reaction. D) the total bond energy of the products during an exothermic reaction
Chemistry
2 answers:
Andre45 [30]2 years ago
8 0

Considering the definition of enthalpy of a hemical reaction and endothermic and exothermic reaction, the correct answer is option C: the change in energy in a system during an exothermic reaction.

The enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

On the other side, an endothermic reaction requires energy while an exothermic reaction releases energy.

In other words, a chemical reaction is endothermic when it absorbs energy from the environment. In this case, the heat is transferred from the outside to the inside of the system.

On the other hand, an exothermic reaction is one where energy flows out of the system. This energy is released in the form of heat.

So, if the enthalpy of reaction is negative, it means that during the course of the reaction, the system loses or releases heat to the environment and is exothermic, while if the enthalpy of reaction is positive, it means that during the course of the reaction, the system absorbs heat from the environment and is endothermic.

So, the correct answer is option C: the change in energy in a system during an exothermic reaction.

Learn more:

  • brainly.com/question/24266321?referrer=searchResults
  • brainly.com/question/13885179?referrer=searchResults
Reptile [31]2 years ago
8 0

The Reaction System Quick Check

1. D) the change in energy in a system during an exothermic reaction

2. D) In the air, only the oxygen is part of the system.

3. D) This is an endothermic reaction because the system took energy from the surroundings.

4. B) Energy is released by the formation of chemical bonds, and energy is absorbed when the bonds are broken

5. B) the jar

the answers change places so be careful

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Helga [31]

Answer:

carbon

Explanation:

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8 0
3 years ago
. The freezing point of an aqueous solution containing a nonelectrolyte solute is – 2.79 °C. What is the boiling point of this s
Semmy [17]

Answer:

Boiling point of the solution is 100.78°C

Explanation:

This is about colligative properties.

First of all, we need to calculate molality from the freezing point depression.

ΔT = Kf . m . i

As the solute is nonelectrolyte, i = 1

0°C - (-2.79°C) = 1.86 °C/m . m . 1

2.79°C / 1.86 m/°C = 1.5 m

Now, we go to the boiling point elevation

ΔT = Kb . m . i

Final T° - 100°C  =  0.52 °C/m . 1.5m . 1

Final T° =  0.52 °C/m . 1.5m . 1  + 100°C → 100.78°C

4 0
3 years ago
There are three factors in which natural selection occurs. Select one statement from the list below that is a true statement abo
azamat

Answer: There is no list in your question. But the three factors in which natural selection occurs are:

1. A struggle for existence,

2. Variation and

3. Inheritance

Explanation:

Darwin’s theory of natural selection is the way in which organisms change overtime.

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The three major factors through which natural selection occurs are:

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2. Variation and

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Darwin’s theory of natural selection will occur if the three conditions above are met and unless these factors are in place, natural selection will not occur.

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3 years ago
How many moles of oxygen gas can 0.882 mol of hydrogen peroxide produce if decomposition is complete? 2H2O2 (l) → 2H2O(l) + O2(g
andreyandreev [35.5K]
We are given the chemical reaction and the amount of reactant used for the process. We use these data together to obtain what is asked. We do as as follows:

0.882 mol H2O2 ( 1 mol O2 / 2 mol H2O2 ) = 0.441 mol O2 produced

Hope this answers the question.
5 0
3 years ago
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If there weren't any predators, the population of prey would increase and they would starve due to too many mouths to feed.

6 0
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