Lesson 3.2: Exploring Chemical Reactions
Metabolism
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Activity 1
Metabolism: Lesson 3.2
Investigation Notebook pg 68
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Activity 1
Metabolism: Lesson 3.2
Investigation Notebook pg 68
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Vocabulary
Activity 2
Metabolism: Lesson 3.2
the ability to make things move or change
energy
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Activity 2
Metabolism: Lesson 3.2
Today, we’ll observe a chemical reaction to investigate this question:
Investigation Question: �How do oxygen and glucose molecules release energy in the cells?
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Investigation Notebook pg 1
Follow instructions. �Don’t taste things. �Smell substances like a chemist. �Protect your eyes. �Protect your hands. �Keep your hands away from your face. �Tell your teacher if you have allergies. �Be calm and careful. �Report all spills, accidents, and injuries to your teacher. �Avoid anything that could cause a burn. �Wash your hands after class.
Safety Guidelines for Science Investigations
1.�2.�3.�4.�5.�6.�7.�8.�9.�10.�11.
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Activity 2
Metabolism: Lesson 3.2
We’ll investigate with these substances. There are four types of molecules in them: water and phenol red in the liquid and baking soda and calcium chloride in the powder.
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Observe a Chemical Reaction
Activity 2
Metabolism: Lesson 3.2
Measure
Measure 10 mL of phenol red solution from the squeeze bottle into the graduated cylinder.
Combine
Carefully open the bag with the powders and pour the phenol red solution into the bag.
Seal bag and mix
Push the air out of the bag, and then seal it. Gently massage the outside of the bag to mix the substances.
Touch and observe
Have each group member touch the bag and share their observations.
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Activity 2
Metabolism: Lesson 3.2
Investigation Notebook pg 69
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Activity 2
Metabolism: Lesson 3.2
What did the substances look like after the reaction?
How did you know the reactants changed in the process you observed?
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Activity 2
Metabolism: Lesson 3.2
The substances we end with are not the same substances we started with. The substances in the bag are now carbon dioxide, chalk, salt, phenol red, and water.
What we just observed is an example of a chemical reaction.
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Activity 2
Metabolism: Lesson 3.2
Energy can also be released during a chemical reaction.
Was there evidence during this chemical reaction that suggests that energy was released?
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Activity 3
Metabolism: Lesson 3.2
We combined substances to observe a chemical reaction.
Something like this happens inside the cells of the body with glucose and oxygen.
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Activity 3
Metabolism: Lesson 3.2
Next, you’ll read and annotate a short article about this chemical reaction that will help you answer our Investigation Question.
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Cellular Respiration
10 MIN
Metabolism: Lesson 3.2
Open the article
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Open the Metabolism Sim
10 MIN
Metabolism: Lesson 3.2
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Activity 4
Metabolism: Lesson 3.2
The chemical reaction in the plastic bag was a helpful model for understanding what happens when energy is released inside of the trillions of cells in our bodies.
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Activity 4
Metabolism: Lesson 3.2
The Metabolism Sim is another model showing how cellular respiration works inside the cells.
Let’s look at the features of the Sim.
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© The Regents of the University of California. All rights reserved.
Activity 4
Metabolism: Lesson 3.2
Investigation Notebook pg 70
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Activity 4
Metabolism: Lesson 3.2
Where did the chemical reaction take place?
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Activity 4
Metabolism: Lesson 3.2
What evidence did you see that energy was being released during cellular respiration?
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Activity 4
Metabolism: Lesson 3.2
What new substances were produced in the chemical reaction?
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Activity 4
Metabolism: Lesson 3.2
Let’s take a look at this diagram, which shows another way of modeling how cellular respiration happens.
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Activity 4
Metabolism: Lesson 3.2
In the Sim, each molecule is represented as a colorful shape, but this model shows how the molecules are made up of smaller parts called atoms.
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Activity 5
Metabolism: Lesson 3.2
Investigation Notebook pg 71
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Activity 5
Metabolism: Lesson 3.2
Investigation Question: How do oxygen and glucose molecules release energy in the cells?
How would you answer our question based on the activity, reading, and Sim observations?
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Key Concept
Activity 5
Metabolism: Lesson 3.2
9.
Inside the cell, the atoms that make up glucose and oxygen can be rearranged to make different molecules. This chemical reaction is called cellular respiration and releases energy.
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Activity 6
Metabolism: Lesson 3.2
For this activity, you will watch a video about one of the first scientists to study cellular respiration. Then, you’ll answer a question based on what you’ve learned.
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© The Regents of the University of California. All rights reserved.
© The Regents of the University of California. All rights reserved.
Metabolism: Lesson 3.2
End of Lesson
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