Endo & Exo Reactions Mini-Lesson

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Endothermic and Exothermic Reactions

Multiple Choice

First, let us review...

What are some signs that a chemical reaction has taken place?

• Change in shape

• Melting

• Bubbles of gas appear

• Dissolving

Multiple Choice

After you combine two substances together, a new substance forms. This would be an example of a ---

• physical change

• chemical change

​Endothermic Reaction

• ​Energy is absorbed into the reaction

• Endo- means to be absorbed or to enter

• Surroundings usually feel cool

Multiple Choice

In an endothermic reaction, energy is ---

• Absorbed

• Released

Multiple Choice

If a chemical reaction is endothermic, the temperature in the surroundings would ___ as the reaction absorbs energy.

• Increase

• Decrease

• Stay the same

​Exothermic Reaction

• ​Energy is released into the reaction

• Exo- means to exit or to be released

• Surroundings usually feel hot

Multiple Choice

In an exothermic reaction, energy is ---

• Absorbed

• Released

Multiple Choice

If a chemical reaction is exothermic, the temperature of the surroundings would ___ as energy is released from the reaction.

• Increase

• Decrease

• Stay the same

​Heat

• ​In exothermic reactions, heat moves out of the system.

• In endothermic reactions, heat moves into the system.

Multiple Choice

What instrument would you use to detect whether a reaction was endothermic or exothermic?

• Digital scale

• Thermometer

• Ruler

• Barometer

Multiple Choice

____ reactions usually feel cool.

• Endothermic

• Exothermic

Multiple Choice

Surrounding temperatures get warmer in ___ reactions.

• Endothermic

• Exothermic

Multiple Choice

The process of photosynthesis is an ____ reaction.

• Endothermic

• Exothermic

Multiple Choice

The initial temperature of a reaction measured to be 20^oC. The final temperature was 45^oC. The reaction was ---

• Endothermic

• Exothermic

Multiple Choice

A rocket launch is an example of an ___ reaction.

• Endothermic

• Exothermic

Multiple Choice

The initial temperature of a reaction measured to be 20^oC. The final temperature was 10^oC. The reaction was ---

• Endothermic

• Exothermic

Multiple Select

Which of the following are examples of endothermic reactions? (The reaction absorbs heat.)

Choose 2.

• Baking a cake

• Water evaporating

• Candles burning

• Water freezing

Multiple Select

Which of the following are examples of exothermic reactions? (The reaction releases heat.)

Choose 2.

• Baking a cake

• Water evaporating

• Candles burning

• Water freezing