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Checking Two Models of a Three-Carbon Gas 4 questions
Checking Two Models of a Three-Carbon Gas
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A lab display compares two model molecules for a gas. Each drawing groups a carbon atom with the hydrogen atoms attached to it. Lines between groups show bonds between the carbon atoms. Two lines represent a double bond.
Question 1
Write the molecular formula for each drawing. Show how you determined the hydrogen counts.
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Question 2
Which statement correctly compares the carbon bonds in the models?
- Both models contain a ring.
- Only Model A contains a ring.
- Model A has a carbon double bond, and Model B has a ring of single bonds.
- Both models have an open chain containing a carbon double bond.
The gas has a measured molecular mass of about 42 u. A separate measurement indicates that two carbon atoms in each molecule share a double bond. Assume one of the two drawings represents the gas.
Question 3
Which measurement distinguishes the models, and which model fits it? Explain why the other measurement cannot make that distinction.
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Question 4
A student says the rightmost carbon in A has only three bonds because it is attached to three atoms. Explain how the drawing can be consistent with four shared electron pairs around that carbon.
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