Lesson 3 Heat and Materials

A reaction requires a very high temperature in order to be carried out. The high temperatures are not safe and could damage equipment. Which description is a possible solution to this need?

• insulate the outside of the container for the reaction

• insulate the inside of the container for the reaction

• perform the reaction at a higher pressure so the temperature can be lowered

• perform the reaction at a lower pressure so that the temperature can be lowered

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NGSS.MS-PS3-3

Which of these is an example of a reaction that absorbs energy?

• A cake baking

• A candle burning

• A firework exploding

• A piece of wood smoldering

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NGSS.MS-PS1-4

Which can happen when energy is transferred from one system to another?

• new energy is created

• some energy is destroyed

• the energy changes form

• the energy changes into mass

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NGSS.MS-PS3-5

A burning candle is an example of a chemical reaction taking place. What can be inferred about this reaction?

• Mass is not conserved

• The reaction absorbs energy

• The reaction releases energy

• There are reactants but no products

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NGSS.MS-PS1-4

NGSS.MS-PS1-5

The graph represents energy changes that occur during a chemical reaction. What does the graph show about the reaction?

• The reaction absorbs energy

• The reaction releases energy

• The reaction destroys energy

• The reaction does not involve energy

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NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-3

Why does increasing temperature generally increase the rate of a chemical reaction?

• It increases the amount of reactant

• It decreases the size of the reactant particles

• It causes the particles of the reactants to move faster and collide more often

• It increases the space between reactant particles so they have more room to move apart

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

The diagram shows what happens before and after two unknown substances are mixed. What can be inferred about the chemical reaction that has occurred?

• The reaction absorbs energy

• The reaction releases energy

• The reaction destroys energy

• The reaction does not involve energy transfer

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS1-2