question 4
1 pts
for the molecule below, choose the image that accurately does all of the following:
- shows the pair of electrons shared between atoms
- shows the electrons closest to the more electronegative atom or in the middle of the bond if the atoms are roughly equally electronegative (

Question

question 4
1 pts
for the molecule below, choose the image that accurately does all of the following:
- shows the pair of electrons shared between atoms
- shows the electrons closest to the more electronegative atom or in the middle of the bond if the atoms are roughly equally electronegative (<0.5 difference)
- correctly labels partial charges if there are any
- places and asterisk next to any polar covalent bonds
- indicates whether the molecule is polar or nonpolar

molecular structure: h-c-c-h with h atoms attached
option 1 image (with polar molecule label)
option 2 image

Accepted Answer

To solve this, we analyze the molecule (ethane, $ \text{C}_2\text{H}_6 $):

1. **Electronegativity Difference**: $ \text{C} $ and $ \text{H} $ have an electronegativity difference $ < 0.5 $, so bonds are nonpolar covalent (electrons in the middle of bonds).
2. **Partial Charges**: Since $ \text{C} $ and $ \text{H} $ have similar electronegativity, there are no partial charges ($ \delta^+ $ or $ \delta^- $).
3. **Polarity of Molecule**: Ethane is symmetric, so it is nonpolar.
4. **Bond Representation**: Shared electrons (pairs) should be shown in the middle of $ \text{C–C} $ and $ \text{C–H} $ bonds (no asterisk for nonpolar bonds).

The first option (with "Polar molecule" is incorrect, as ethane is nonpolar). The second option incorrectly labels partial charges. Wait, re-evaluating: Ethane’s $ \text{C–H} $ and $ \text{C–C} $ bonds are nonpolar (electronegativity difference $ < 0.5 $), so no partial charges, no polar bonds (no asterisk), and the molecule is nonpolar. However, if the options are as given, the key is:

- Correct bond electrons (middle for nonpolar), no partial charges, no asterisk, and nonpolar. But since the first option mislabels as polar, and the second has incorrect partial charges, perhaps a formatting error. Wait, ethane is nonpolar, so the correct image should show:
  - Shared electrons in bond middles,
  - No partial charges,
  - No asterisk (nonpolar bonds),
  - Label "Nonpolar molecule".

But based on the options, if forced to choose, the first option is wrong (polar label), the second has wrong partial charges. Wait, maybe the original molecule is misrepresented. Wait, ethane ($ \text{C}_2\text{H}_6 $): $ \text{C–C} $ and $ \text{C–H} $ bonds are nonpolar (electronegativity difference $ \approx 0.35 $ for $ \text{C–H} $, $ 0 $ for $ \text{C–C} $). So:

- Shared electrons: in the middle of bonds.
- Partial charges: none (since $ \Delta \chi < 0.5 $).
- Polar bonds: none (so no asterisk).
- Molecule: nonpolar (symmetric tetrahedral around each C, overall symmetric).

Assuming the options have a typo, but the correct logic: the molecule is nonpolar, bonds are nonpolar (no asterisk, no partial charges). If we must choose between the two, the first option’s "Polar molecule" is wrong. The second has incorrect $ \delta $ labels. But maybe the intended answer is that the molecule is nonpolar, bonds are nonpolar, so the correct image (not shown here, but from the options, likely the one with no partial charges and labeled nonpolar, but since the given options are flawed, rechecking:

Wait, the first option shows asterisks (implying polar bonds) but $ \text{C–H} $ and $ \text{C–C} $ are nonpolar. The second option has $ \delta $ labels (wrong, as no partial charges). This suggests a mistake, but ethane is nonpolar, bonds are nonpolar. So the correct image should:

- Show shared electrons in bond middles,
- No partial charges,
- No asterisk,
- Label "Nonpolar molecule".

Since the options provided may have errors, but based on the problem’s requirements, the correct answer (assuming a nonpolar label and correct bond/charge representation) would be the one that:

- Shows electrons in bond middles,
- No partial charges,
- No asterisk,
- Labels "Nonpolar molecule".

But if we have to choose between the two given:

- First option: Wrong (labels as polar, asterisks on nonpolar bonds).
- Second option: Wrong (partial charges on nonpolar bonds).

This suggests a formatting error, but ethane is nonpolar with nonpolar bonds. So the correct answer (if we assume a typo and the intended molecule is nonpolar) would be the image with no partial charges, no asterisk, and labeled nonpolar. Since the first option labels as polar (incorrect), the second has wrong charges. However, if forced, the correct logic is ethane is nonpolar, so the answer should reflect that.

# Brief Explanations:
The molecule is ethane ($ \text{C}_2\text{H}_6 $). $ \text{C–C} $ and $ \text{C–H} $ bonds have electronegativity differences $ < 0.5 $ (nonpolar covalent), so electrons are in bond middles, no partial charges, no polar bonds (no asterisk), and the molecule is nonpolar (symmetric).

# Answer:
(Assuming the correct image (not fully shown) follows the above; if choosing between given, the first option is incorrect (polar label), the second has wrong charges. But ethane is nonpolar, so the correct image should label "Nonpolar molecule", show electrons in bond middles, no partial charges, no asterisk.)

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