Systems and Scale Unit Activity 5.2: Explaining Methane Burning 1 Unit Map 2 You are here Constructing explanations Consider the following as you construct your explanation: Evidence from the investigation What you learned from the
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Presentation Transcript
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Systems and Scale Unit Activity 5.2: Explaining Methane Burning 1<br>
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Unit Map 2 You are here<br>
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Constructing explanations Consider the following as you construct your explanation:
Evidence from the investigation
What you learned from the molecular modeling activity
Three Questions Handout 3<br>
04
Comparing Ideas with a Partner Compare your explanations for each of the Three Questions.
How are they alike?
How are they different?
Check your explanation with the middle- and right-hand columns of the Three Questions handout.
Consider making revisions to your explanation based on your conversation with your partner. 4<br>
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Matter Movement Do you have:
An arrow showing methane evaporating and going into the flame
An arrow showing O2 or oxygen going into the flame 5 Methane O2<br>
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Matter Movement Do you have:
An arrow showing carbon dioxide or CO2 leaving the flame
An arrow showing water H2O leaving the flame 6 Methane CO2 Methane O2 CO2 H2O<br>
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Matter Change What is the name of the chemical change that allows cells to move and function?
Combustion 7<br>
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Matter Change What molecules are carbon atoms in before the chemical change?
Methane or CH4
What other molecules are needed?
Oxygen or O2
Write the chemical equation for this change:
CH4 + 2 O2
CO2 + 2 H2O What molecules are carbon atoms in after the chemical change?
Carbon dioxide or CO2
What other molecules are produced?
Water or H2O 8 Chemical Change<br>
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Energy Change What forms of energy go into this chemical change?
Chemical energy or C-C and C-H bonds What forms of energy come out of this chemical change?
Light and heat energy
Where does the energy go or stay after the change?
It leaves the methane as heat. 9 Energy transformation<br>
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Telling the Whole Story Question: What happens to methane when it burns?
Does your story include these parts? (Check the back of the Three Questions Handout.) 10<br>
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Compare your Explanations for Ethanol and Methane How are your explanations for the combustion of ethanol and methane the same? How are they different? 11<br>
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How have your ideas changed? Gather together your process tools for the unit (Expressing Ideas Tool, Predictions Tool, & Evidence-Based Argument Tool).
How have your ideas changed related to:
Scale?
Movement?
Carbon?
What do you know about ethanol now that you didn’t know before the investigation? 12<br>
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Exit Ticket Conclusions
How is methane combustion similar to ethanol combustion?
Predictions
Why do you think ethanol burns and water does not? 13<br>
