Which is NOT true about endothermic reactions?

The energy needed to break bonds in the reactants is less than the energy released by bonds forming.

More energy is absorbed than released.

Energy is absorbed mainly in the form of heat.

Energy is required to sustain the reaction.

According to the law of conservation of energy, the energy released in an exergonic reaction ________.

equals the difference between the energy of reactants and products

equals the energy of the bonds broken

equals the energy of the bonds formed

equals the sum of the energy of the reactants and products

Is photosynthesis an endergonic reaction or exergonic reaction? How do you know?

Endergonic, because it requires energy input in the form of sunlight to proceed.

Exergonic, because it releases energy in the form of glucose.

Endergonic, because it releases oxygen into the atmosphere.

Exergonic, because it involves breaking bonds in carbon dioxide and water.

Explain why the total amount of energy does not decrease in an exergonic chemical reaction.

Because energy is conserved, and any energy released is transferred to the surroundings.

Because exergonic reactions require an energy input that balances the energy released.

Because the reaction stores all released energy within the products.

Because energy is destroyed during exergonic reactions, leading to a decrease.

Explain how a reaction could be endergonic but not endothermic.

The reaction absorbs free energy from its surroundings but does not require heat to proceed.

The reaction releases heat but stores free energy in the products.

The reaction involves a decrease in entropy, making it spontaneous without absorbing heat.

The reaction occurs at a very low temperature, so it doesn’t rely on heat absorption.

Is the reaction a firefly makes to glow exergonic or endergonic? How do you know?

Exergonic, because the reaction releases energy in the form of light.

Endergonic, because the reaction requires ATP to occur.

Exergonic, because the reaction absorbs energy from the environment to produce light.

Endergonic, because it stores light energy in the products.

To develop a product that warms people’s hands, would you use an exothermic or endothermic reaction? Why?

Exothermic, because it releases heat to the surroundings.

Endothermic, because it absorbs heat from the surroundings.

Exothermic, because it absorbs cold from the environment.

Endothermic, because it requires energy input to start the reaction.

PS M19 L3 Notes Review

Authored by Grace Paulson

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9th Grade

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FILL IN THE BLANK QUESTION

30 sec • 1 pt

the force that holds two atoms together

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30 sec • 1 pt

All chemical reactions release or absorb ________________.

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30 sec • 1 pt

Chemical bonds are the ________________ of this energy.

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30 sec • 1 pt

The breaking of bonds ________________ energy.

requires

releases

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30 sec • 1 pt

The formation of bonds ________________ energy.

releases

requires

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30 sec • 1 pt

Chemical reactions that ________________ energy are called exergonic reactions.

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30 sec • 1 pt

When the energy of an exergonic reaction is given off mostly in the form of ________________ energy, the reaction is called an exothermic reaction.

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PS M19 L3 Notes Review

the force that holds two atoms together

All chemical reactions release or absorb ________________.

Chemical bonds are the ________________ of this energy.

The breaking of bonds ________________ energy.

The formation of bonds ________________ energy.

Chemical reactions that ________________ energy are called exergonic reactions.

When the energy of an exergonic reaction is given off mostly in the form of ________________ energy, the reaction is called an exothermic reaction.

Chemical reactions that ________________ energy are called endergonic reactions.

When the energy needed to keep an endergonic reaction going is in the form of ________________ energy, the reaction is called an endothermic reaction.

This graph shows a ________________ reaction.

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