Exothermic & Endothermic

Exothermic & Endothermic Reactions
Lesson 7.1.3

By Laura O'Neill

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Exo = means out - like exit

therm - means heat - like thermal underwear

ic - meaning of or belonging to

Exothermic - a chemical reaction that gives off heat

​​Exothermic

​Endo = means inside or into - like

therm - means heat - thermal

ic - meaning related to or belong to

Endothermic - a chemical reaction that takes heat in

​​Endothermic

Multiple Select

Which of the following are signs that a chemical reaction is occurring in the fire?

Use notes from yesterday's lesson for help!

• producing light

• wood turns black

• heat is given off

• insects are attracted to the fire

​Notebook
​Remember, Temperature change is an indicator of a chemical change. We will discuss two forms of that change.

A chemical reaction that causes the temperature to decrease.


Some examples are:
- mixing baking soda & vinegar
- cooking an egg
- baking
- photosynthesis

​Endothermic

A chemical reaction that causes the temperature of the substance to increase.

Some examples are:
- Rusting
- Heating Pack
- Nuclear Fission
- Fire burning

​

​Exothermic

Now let's try an Endothermic vs Exothermic Interactivity!

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Multiple Choice

Which combination of substances caused the greatest temperature change in the sports pack?

• 10g iron powder & 10g water

• 20g iron powder & 10g water

• 20g iron powder & 20g water

• 10g iron powder & 20g water

Match

Match the type of reaction that occurs.

• heat pack

• cold pack

• baking cookies

exothermic

endothermic

endothermic

• exothermic

• endothermic

• endothermic

Multiple Choice

A science teacher was demonstrating elephant toothpaste to their students. They showed how the temperature of the foam was higher in temperature than the original liquids. What type of reaction is this?

• Exothermic

• Endothermic

Draw

Why are cooking chocolate chip cookies endothermic?

​See You Tomorrow for Chemical Bonds!