Exothermic and endothermic reactions

Exothermic and Endothermic Reactions
Topic 6. Chemical Energetics 
28 February 2024
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ChemistrySecondary EducationAge 12,13

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Exothermic and Endothermic Reactions
Topic 6. Chemical Energetics 
28 February 2024

Slide 1 - Tekstslide

Our Learning Map
prepare a quick slide presentation about the chosen scenario that demonstrates the difference between exothermic or endothermic reactions
exemplify the importance of exothermic and endothermic reactions in daily life
prepare a quick slide presentation to show an interpretation of an exothermic or an endothermic reaction profile (reaction pathway diagram)

Slide 2 - Tekstslide

Flipped learning Review
  • Goal - Pair up and answer the given questions in the Kahoot game. The questions are based on the video content. Win the game, and you earn an EC.
  • Product/Output - Kahoot results.
  • Standards - Correct responses.

Slide 3 - Tekstslide

Slide 4 - Link

Hinge-point Discussion
reactants
product
carbon + 2 oxygen
carbon dioxide

Slide 5 - Tekstslide

Types of Chemical Processes

Slide 6 - Tekstslide

Correcting Misconception
ALL chemical reactions are exothermic.

Slide 7 - Tekstslide

Correcting Misconception
ALL chemical reactions are exothermic.

Slide 8 - Tekstslide

Types of Chemical Reactions

Slide 9 - Tekstslide

Slide 10 - Tekstslide

Slide 11 - Tekstslide

Exothermic and Endothermic Reactions
Topic 6. Chemical Energetics 
28 February 2024

Slide 12 - Tekstslide

Reaction Pathway Diagrams (Reaction Profiles)
  • Used to represent the energy changes involved in a chemical reaction
Step 1 : Draw and label the x and y axes.
Step 2 : Write the chemical equation.
Step 3 : Identify whether it is an exothermic or endothermic reaction.
Step 4 : Draw the line for the reactant.
Step 5 : Draw the line for the product.
Step 6 : Draw the arrow for the energy released or absorbed.

Slide 13 - Tekstslide

Example 1:
STEPS:
Step 1 : Draw and label the x and y axes.
Step 2 : Write the chemical equation.
Step 3 : Identify whether it is an exothermic or endothermic reaction.
Step 4 : Draw the line for the reactant.
Step 5 : Draw the line for the product.
Step 6 : Draw the arrow for the energy released or absorbed.
CH4 (g) + O2 (g) → CO2 (g) + 2H2O (l)          △H = 891 kJ/mol

Slide 14 - Tekstslide

Example 2:
STEPS:
Step 1 : Draw and label the x and y axes.
Step 2 : Write the chemical equation.
Step 3 : Identify whether it is an exothermic or endothermic reaction.
Step 4 : Draw the line for the reactant.
Step 5 : Draw the line for the product.
Step 6 : Draw the arrow for the energy released or absorbed.
CaCO3 (s) →  CaO (s) + CO2 (g)          △H = +178 kJ/mol
heat

Slide 15 - Tekstslide

Exothermic and Endothermic Reactions
Topic 6. Chemical Energetics 
28 February 2024

Slide 16 - Tekstslide

Closing : Lesson Key Points

Slide 17 - Tekstslide