Exothermic vs Endothermic and Thermal Energy

Endothermic and Exothermic Reactions

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Exothermic and Endothermic Reactions

To be able to describe an exothermic and endothermic reaction using words and diagrams

Exothermic Reaction

• Another example of a chemical reaction is an exothermic reaction

• Exothermic reactions release thermal energy to the surroundings

• In an exothermic reactions the temperature increases

These are exothermic reactions

• combustion [burning]

• heating magnesium

• neutralisation reaction [this is when an acid and alkali react together]

• rusting of an iron nail

Multiple Choice

What is an exothermic reaction?

• heat energy is given out to the surroundings

• heat energy is taken into the substance

• no energy is given out

Poll

Exothermic reactions give out heat energy to the surroundings?

• True

• False

Multiple Select

An example of an exothermic reaction is? Pick as many which you think apply?

• rusting nail

• neutralisation

• acid and alkali

• burning magnesium

• combustion

Poll

An example of an exothermic reaction is?

• rusting nail

• neutralisation

• acid and alkali

• burning magnesium

• combustion

Multiple Select

What happens to the temperature in an exothermic reaction?

• it stays the same

• the temperature decreases

• the temperature increases

Multiple Choice

Which of the following process is exothermic?

• Candle melting

• A puddle evaporating

• Dry ice (solid carbon dioxide) subliming to form gaseous carbon dioxide

• Water freezing to form ice

Multiple Choice

What is an example of exothermic?

• firework

• ice pack

• coal

• wood

Multiple Choice

What type of reaction occurs in a hand warmer?

• exothermic

• endothermic

Multiple Choice

What type of reaction is shown in the photo?

• Exothermic

• Isothermic

• Endothermic

• None of the  above

Multiple Choice

If a chemical reaction is EXOTHERMIC, the temperature would....

• Stay the same
• Increase
• Decrease

Multiple Choice

In an exothermic reaction, heat is ...

• taken in
• given out

Endothermic Reactions

• This is a chemical reaction

• The reaction takes heat in from the surroundings

• The temperature of the products decreases

• Endothermic reactions can be detected because of a temperature change

endothermic reaction

• photosynthesis is an endothermic reaction

• adding citric acid to sodium hydrogen carbonate

  
  

Multiple Choice

Endothermic means energy _______.

• absorbed

• released

Multiple Choice

____ reactions usually feel cold.

• endothermic

• exothermic

Multiple Choice

Is photosynthesis an Exothermic or an Endothermic reaction?

• Endothermic

• Exothermic

Endothermic reaction

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Endothermic Reaction

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Multiple Choice

Baking bread and cooking an egg are examples of....?

• Endothermic processes
• Exothermic processess
• None of these 

Multiple Choice

A student mixed two chemicals to allow them to react. The temperature before the reaction was 25 ° C. The temperature after the reaction was 18° C. Which of the following is true?

• The temperature changed

• It is an endothermic reaction

• It is an exothermic reaction

Multiple Choice

In an endothermic reaction, heat is ...

• taken in

• given out