High college Chemistry assist » Thermochemistry and Energetics » assist with Endothermic and also Exothermic reactions
Explanation:

The meaning of one endothermic reaction is the the assets have greater energy 보다 the reactants, leading to a optimistic enthalpy the reaction. Because that the reaction come run, there must be an entry of energy. The contrary is true for exothermic reactions: the assets have lower energy than the reactants, enthalpy that reaction is negative, and heat is released.

You are watching: Which of the following is true about endothermic reactions?

Nothing is deserve to be definitively stated about the prices of either form of reaction without extr information, as that will rely on the certain reactions and also their corresponding activation energies.


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Example concern #1 : aid With Endothermic and also Exothermic reaction


Which that the following is an example of one exothermic reaction?


Possible Answers:

Water boiling


Ice melting


Dry ice becoming gaseous carbon dioxide


Magma cooling to form igneous rocks


Correct answer:

Magma cooling to type igneous rocks


Explanation:

In an exothermic reaction, heat has been released to the next site from the system. Together a result, the molecules room at a lower final power state after ~ releasing the power to the surroundings. 

Going indigenous a solid come a gas (as well together liquid in between) is one endothermic reaction. Power must be soaked up in order to raise the power of the molecule so that the phase change can take it place. Boil water, melting ice, or sublimating carbon dioxide all call for an entry of energy.

The opposite is observed once magma cools. The fluid magma releases energy to the surroundings, permitting it to cool and type igneous rock. The magma is basically "freezing," turning from a fluid to a solid.


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Example question #1 : assist With Endothermic and Exothermic reactions


Which the the following statements is true?


Possible Answers:

Only endothermic reactions require energy in order to take place


Condensation of heavy steam is one endothermic reaction


Exothermic reactions have actually a reduced activation energy compared to the turning back endothermic reactions


Endothermic reactions an outcome in products with a lower inner energy


Correct answer:

Exothermic reactions have actually a reduced activation energy contrasted to the turning back endothermic reactions


Explanation:

When graphically tracking the energy of a reaction, you deserve to see that energy is constantly needed to start a reaction, regardless of the enthalpy. This necessary energy is dubbed the activation energy. Exothermic reactions, however, have a reduced activation energy compared to the reverse endothermic reaction. This is due to the fact that there is a net energy release indigenous an exothermic reaction since the commodities have less power than the reactants. To reverse this reaction would certainly be to go from the low power products ago to the high power reactants, causing a net increase in power (an endothermic process).

Condensation of steam is an exothermic process. Heat must it is in released because the high energy steam is ending up being lower power water.


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Example concern #1 : help With Endothermic and also Exothermic reactions


The burning of propane gas in a camping range is an example of what form of reaction?


Possible Answers:

Exothermic reaction, with heat being released


Endothermic reaction, with heat being absorbed


It counts on the temperature at which the reaction occurs


Exothermic reaction, with warm being absorbed


Endothermic reaction, with warm being released


Correct answer:

Exothermic reaction, with warmth being released


Explanation:

Combustion reactions happen when a link is oxidized in a very exothermic reaction. Most commonly, the reactant is a hydrocarbon (such together propane) and also the oxidizing certified dealer is oxygen gas. The result is a large release of warm energy, typically visualized as a flame.

Note the exothermic reactions by an interpretation release heat, while endothermic reactions absorb heat.


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Example inquiry #1 : aid With Endothermic and also Exothermic reaction


Which problem is always true for an exothermic reaction?


Possible Answers:

Heat is being obtained from the environment


 is positive


 is negative


The molecular bonds that the compound room being broken


There must be a catalyst involved


Correct answer:

 is negative


Explanation:

When a reaction is exothermic ("exo-" meaning out and also "-thermic" having to carry out with heat), it method that the reaction is offering off warmth into the environment. Therefore, the reactants have a net heat loss throughout the process of the reaction.

The readjust in enthalpy, , is a measure of the adjust in heat energy throughout a reaction.  is always negative for an exothermic process because the products always have less heat energy than the reactants.


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Example question #6 : aid With Endothermic and Exothermic reaction


Which problem is constantly true for an exothermic reaction?


Possible Answers:

Heat is being got from the environment


 is positive


There must be a catalyst involved


 is negative


Correct answer:

 is negative


Explanation:

When a reaction is exothermic ("exo-" definition out and also "-thermic" having actually to carry out with heat), it means that the reaction is giving off heat into the environment. Therefore, the reactants have a net heat loss throughout the process of the reaction.

The readjust in enthalpy, , is a measure of the adjust in heat energy during a reaction.  is always an unfavorable for an exothermic procedure because the products always have less heat energy than the reactants.


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Example question #1 : assist With Endothermic and also Exothermic reaction


Which problem is constantly true for an exothermic reaction?


Possible Answers:

 is positive


 is negative


Heat is being obtained from the environment


There should be a catalyst involved


Correct answer:

 is negative


Explanation:

When a reaction is exothermic ("exo-" definition out and "-thermic" having actually to do with heat), it means that the reaction is offering off warm into the environment. Therefore, the reactants have actually a net heat loss throughout the procedure of the reaction.

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The change in enthalpy, , is a measure up of the change in warmth energy during a reaction.  is always negative for an exothermic process because the products always have much less heat power than the reactants.


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