11C Energy Changes in Chemical Reactions

What is the general term used to describe the energy change that occurs in a chemical reaction?

• enthalpy

• exothermic

• endothermic

• activation energy

Tags

NGSS.HS-PS1-4

Define exothermic reaction.

• A chemical reaction that occurs at extremely high temperatures.

• A chemical reaction that releases energy in the form of heat or light.

• A chemical reaction that does not release any energy.

• A chemical reaction that absorbs energy in the form of heat or light.

Tags

NGSS.HS-PS1-4

Define endothermic reaction.

• An endothermic reaction is a chemical reaction that absorbs heat from its surroundings.

• An endothermic reaction is a chemical reaction that does not involve any heat exchange.

• An endothermic reaction is a chemical reaction that occurs at extremely high temperatures.

• An endothermic reaction is a chemical reaction that releases heat into its surroundings.

Tags

NGSS.HS-PS1-4

In an exothermic reaction, is the energy released or absorbed?

• absorbed

• released

• neutralized

• converted

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NGSS.HS-PS1-4

In an endothermic reaction, is the energy released or absorbed?

• consumed

• neutral

• absorbed

• released

Tags

NGSS.HS-PS1-4

What is the symbol used to represent the heat energy change in a chemical equation?

• ΔG

• ΔH

• ΔE

• ΔS

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-4

How is the energy change calculated in a chemical reaction?

• By taking the difference between the energy of the products and the energy of the reactants.

• By dividing the energy of the products by the energy of the reactants.

• By multiplying the energy of the products and the energy of the reactants.

• By adding the energy of the products and the energy of the reactants.

Tags

NGSS.HS-PS1-4

NGSS.HS-PS3-1

What is the sign of the energy change for an exothermic reaction?

• Positive (+)

• Zero (0)

• Undefined

• Negative (-)

Tags

NGSS.HS-PS1-4

What is the sign of the energy change for an endothermic reaction?

• +

• ++

• 0

• -

Tags

NGSS.HS-PS1-4

Classify the following reaction as exothermic or endothermic: 2H2(g) + O2(g) → 2H2O(g)

• endothermic

• catalytic

• spontaneous

• exothermic

Tags

NGSS.HS-PS1-4