7 Points Question 10 Draw the Lewis structure for the HCN molecule, then answer the following questions regarding the Lewis structure for the HCN molecule How many electrons are in the Lewis structure for the HCN molecule? Blank 1 How many total bonds in the structure? Blank 2 Which atom is the central atom? Blank 3 How many lone pairs of electrons are on the central atom? Blank 4 How many single bonds in the Lewis structure for the HCN molecule? Blank 5 How many double bonds in the Lewis structure for the HCN molecule? Blank 6 How many triple bonds in the Lewis structure for the HCN molecule? Blank 7 Blank 1 Add your answer Blank 2 Add your answer Blank 3 Add your answer Blank 4 Add your answer Blank 5 Add your answer Blank 6 Add your answer Blank 7 \( \square \)

To answer the questions regarding the Lewis structure for the HCN molecule, let's first draw the Lewis structure step by step. ### Step 1: Count the total number of valence electrons - Hydrogen (H) has 1 valence electron. - Carbon (C) has 4 valence electrons. - Nitrogen (N) has 5 valence electrons. Total valence electrons = \(1 + 4 + 5 = 10\) electrons. ### Step 2: Determine the central atom In HCN, carbon (C) is the central atom because it can form more bonds than hydrogen and nitrogen. ### Step 3: Draw the initial structure 1. Place H and N on either side of C: ``` H - C - N ``` ### Step 4: Form bonds - H can form 1 bond with C. - C can form 3 bonds with N to satisfy the octet rule for nitrogen. The structure becomes: ``` H | C ≡ N ``` ### Step 5: Count the electrons and bonds 1. **Total electrons**: Each bond consists of 2 electrons. - H-C bond: 2 electrons - C≡N bond: 6 electrons (3 bonds) - Total = \(2 + 6 = 8\) electrons (plus 2 lone electrons on N) - Total = 10 electrons (which matches our initial count). 2. **Total bonds**: - 1 single bond (H-C) - 1 triple bond (C≡N) - Total = 1 + 1 = 2 bonds. 3. **Central atom**: The central atom is C. 4. **Lone pairs on the central atom**: C has no lone pairs. 5. **Single bonds**: There is 1 single bond (H-C). 6. **Double bonds**: There are 0 double bonds. 7. **Triple bonds**: There is 1 triple bond (C≡N). ### Summary of Answers - **Blank 1**: 10 - **Blank 2**: 2 - **Blank 3**: C - **Blank 4**: 0 - **Blank 5**: 1 - **Blank 6**: 0 - **Blank 7**: 1 ### Final Answers - Blank 1: 10 - Blank 2: 2 - Blank 3: C - Blank 4: 0 - Blank 5: 1 - Blank 6: 0 - Blank 7: 1