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PART A: EXOTHERMIC
Answer all underlined questions or instructions in your notebook.
Click the “Break Bonds” button under the picture. What is needed to break a chemical bond?
Click the “Make Bonds” button.
When the circles make new bonds, why do they pair up with a different colored atom?
Click the “Overall Reaction” button.
Copy down the reaction including the colors and arrow sizes. Label it “Exothermic”
Label which circles are atoms and which circles are molecules.
In the overall reaction, what do you notice about the energy of the beginning (reactants) and the energy of the end (products)?
Write down which observation best describes an exothermic chemical reaction?
A reaction takes place and the temperature of the reaction increases.
A reaction takes place and the temperature of the reaction decreases.
The prefix “exo” means external or outside. Why is it called an exothermic chemical reaction?
PART B: ENDOTHERMIC
Answer all underlined questions or instructions in your notebook.
Click on Make Bonds and Overall Reaction buttons.
Copy down the reaction including the colors and arrow sizes. Label it “Endothermic”.
What observation best describes an endothermic chemical reaction?
A reaction takes place and the temperature of the reaction increases.
A reaction takes place and the temperature of the reaction decreases.
The prefix “endo” means internal or inside. Why is it called an endothermic chemical reaction?
ANALYSIS QUESTIONS (Write in your notebook)
1. If you observed a chemical reaction take place and the product is suddenly very cold, would this be an endothermic or an exothermic reaction? Why?
2. The arch on each graph represents when the molecules you start with (reactants) transition into molecules you end with (products). Explain which part of the graph represents when the chemical reaction took place.
3. Which type of reaction needs more energy (activation energy) added to the reactants to begin: exothermic or endothermic? Why do you think this is? (You may research using your Chromebook)
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