Endothermic Reactions

• Science
• Secondary Education
• Age 12,13

Endothermic Reaction

Lesson 2

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Recall of the previous lesson

• Burning only happens in the presence of  a _______ , ________ gas, and heat or __________ energy.
• The other term for burning is _____.
•  Chemical energy stored in the fuel changes to heat and light during burning.

Recall of the previous lesson

• Burning only happens in the presence of  a _______ , ________ gas, and heat or __________ energy.
• The other term for burning is _____.
•  ___________ energy stored in the fuel changes to heat and light during burning.

fuel

Recall of the previous lesson

• Burning only happens in the presence of  a _______ , ________ gas, and heat or __________ energy.
• The other term for burning is _____.
•  Chemical energy stored in the fuel changes to heat and light during burning.

fuel

oxygen

Recall of the previous lesson

• Burning only happens in the presence of  a _______ , ________ gas, and heat or __________ energy.
• The other term for burning is _____.

fuel

oxygen

thermal

Recall of the previous lesson

• Burning only happens in the presence of  a _______ , ________ gas, and heat or __________ energy.
• The other term for burning is _____.
•  __________ energy stored in the fuel changes to heat and light during burning.

fuel

oxygen

thermal

combustion

Recall of the previous lesson

• Burning only happens in the presence of  a _______ , ________ gas, and heat or __________ energy.
• The other term for burning is _____.
•  __________ energy stored in the fuel changes to heat and light during burning.

fuel

oxygen

thermal

combustion

Chemical

Recall of the previous lesson

• Heat is released to the ___________ in an exothermic reaction.
• Temperature _____________ in exothermic reactions. (like from 20^oC to 25^oC). 

Recall of the previous lesson

• Heat is released to the ___________ in an exothermic reaction.
• Temperature _____________ in exothermic reactions. (like from 20^oC to 25^oC). 

surroundings

Recall of the previous lesson

• Heat is released to the ___________ in an exothermic reaction.
• Temperature _____________ in exothermic reactions. (like from 20^oC to 25^oC). 

surroundings

increases

Types of Chemical Reactions

• exothermic =            
• endothermic = 

Types of Chemical Reactions

• exothermic =            
• endothermic = 

exit / release of heat

heat enters or is absorbed for the reaction to happen.

What do we need for this ice to get melted?

Endothermic Reaction

• a chemical reaction that absorbs heat or thermal energy from the surroundings
• thermal energy is changed to chemical energy stored in the chemical bonds

Endothermic

Exothermic

Endothermic process

Exothermic reaction

phet.colorado.edu

Endothermic process vs 

Endothermic reaction

• endothermic process - no reaction has taken place (dissolving) ; NO NEW products are formed.
• endothermic reaction - reaction has taken place ; NEW PRODUCTS are formed. 

page 271 , LB

Activity

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Rate your understanding of the lesson.

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