Identify the Energy Changes That Occur in a Chemical Reaction

The energy level diagram of a reaction is shown. Based on the diagram, it can be deduced that

• it is an endothermic reaction.

• the total energy of the products is 570 kJ.

• the reactant has more energy than the products.

• more bonds are formed than are broken.

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Endothermic reactions ______.

• release more energy than they absorb

• absorb more energy than they release

• release and absorb exactly the same amount of energy

• can either release more energy than they absorb or absorb more energy than

  they release, depending on the reaction

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NGSS.HS-PS1-4

Forming a chemical bond __________

• absorbs energy from the surroundings

• releases energy into the surroundings

• creates energy that did not previously exist

• uses up energy that then no longer exists

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NGSS.HS-PS1-4

A chemical bond __________energy when it breaks.

• increases

• decreases

• absorbs

• releases

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Energy is _________ when bonds form.

• released

• absorbed

• destroyed

• created

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NGSS.HS-PS1-4

Energy is _________ when bonds break.

• absorbed

• created

• destoryed

• released

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NGSS.HS-PS1-4

Energy is needed to break bonds in chemical reactions.

• True

• False

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NGSS.HS-PS1-4

A chemical reaction in which more energy is absorbed than is released is endothermic

• True

• False

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NGSS.HS-PS1-4

In ENDOTHERMIC reactions, energy is _____ by the reaction system from the surroundings.

• Absorbed

• Released

• Eliminated

• Obliterated

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NGSS.HS-PS1-4

What usually happens to TEMPERATURE in an ENDOthermic reaction?

• Increases

• Decreases

• Stays the same

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NGSS.HS-PS1-4

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