Endothermic and Exothermic Processes

Changes can be exothermic or endothermic.

What is meant by the word exothermic?

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The ice melting to form liquid water is an example of...

• an exothermic reaction because it releases heat.

• an endothermic reaction because it releases heat.

• an exothermic reaction because it absorbs heat.

• an endothermic reaction because it absorbs heat.

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Mike tests four solids A, B, C and D. He adds each solid to 10 cm3 of water. He measures the temperature of the water at the start.He then stirs the mixture and measures the temperature of the water again. Here is his results table.

Which solid gives the endothermic change?

• A

• B

• C

• D

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The picture shows a container called a water cooler.

The container is made of clay. The water in the container soaks into the clay, making the outside wet. Water evaporates from the outside, cooling the container.

Explain how evaporation cools a liquid.

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Mike investigates the metal magnesium.

He burns a piece of magnesium in a Bunsen burner flame. Burning (combustion) releases energy. Write down the word used to describe a reaction that releases energy

• Endothermic.

• Exothermic.

• Physical.

• Chemical.

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Safia investigates endothermic and exothermic reactions.

She mixes different chemicals together and records the temperature change.

What is the change on the temperature in the reaction between water and ammonium nitrate?

• +5 °C

• -5 °C

• -4 C°

• +4 °C

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

Safia investigates endothermic and exothermic reactions.

She mixes different chemicals together and records the temperature change.

Based on the results, which reaction is exothermic?

• The first one only.

• The second one only.

• The third one only.

• The first and the third.

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NGSS.MS-PS1-2

NGSS.MS-PS1-4

Chemical reactions can grouped up as endothermic and exothermic reactions. Give two example of each one of them.

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