Question

name
lewis dot structures
savvis chemistry corner

1. use the lewis dot structure provided to determine the number of valence electrons for the following molecules. then, determine the number of bonding and non - bonding electrons for each. also, state the shape of each molecule.

• nh₃
• hcl
• ch₄

1. use the lewis dot structure to determine the number of valence electrons, bonding and non - bonding electrons, and the shape of each molecule. draw the lewis dot structure of each molecule.

• use si, p, s, cl, ar to identify many
• use o, f, ne to identify many
• use h, he to identify many as needed
• formula
• formula
• formula

1. use the puzzle pieces to construct a molecule with the molecular formula c₂h₄. draw its lewis dot structure and its structural formula below.
2. use the puzzle pieces to construct all possible isomers (there are 3) of c₃h₆o₂. draw lewis dot structures and the structural formula below (ch₃cooh is one).

Explanation:

Step1: Identify the Discipline

The problem involves chemical structures, formulas, and molecular diagrams, which falls under Natural Science, specifically Chemistry (a subfield of Natural Science).

Step2: Analyze the Task

The task requires drawing Lewis dot structures, determining the number of atoms (Si, O, H), and constructing molecules from formulas. This involves chemical bonding and molecular structure concepts.

Step3: Approach for Each Part

• For Lewis dot structures: Count valence electrons, arrange atoms, and form bonds/lone pairs.
• For atom counts: Use molecular formula (e.g., \( \text{SiH}_4 \), \( \text{SiO}_2 \), \( \text{H}_2\text{O} \)) to determine the number of each atom.
• For molecule construction: Use the formula to draw the structure (e.g., \( \text{C}_2\text{H}_4 \) has a double bond between carbons, \( \text{CH}_3\text{NO}_2 \) has a nitro or amide - like structure).

Example for \( \text{SiH}_4 \):

• Valence electrons: \( \text{Si} (4) + 4\times\text{H} (1) = 8 \).
• Lewis dot structure: Si in the center, 4 single bonds to H, each H has 2 electrons, Si has 8 (4 bonds).
• Number of Si: 1, H: 4.

Example for \( \text{SiO}_2 \):

• Valence electrons: \( \text{Si} (4) + 2\times\text{O} (6) = 16 \).
• Lewis dot structure: Si double - bonded to two O (each O has 2 lone pairs), or in a network (but for Lewis dot, we can represent as \( \text{O}=\text{Si}=\text{O} \) with lone pairs on O).
• Number of Si: 1, O: 2.

Example for \( \text{H}_2\text{O} \):

• Valence electrons: \( \text{O} (6) + 2\times\text{H} (1) = 8 \).
• Lewis dot structure: O in the center, 2 single bonds to H, 2 lone pairs on O.
• Number of O: 1, H: 2.

Example for \( \text{C}_2\text{H}_4 \):

• Valence electrons: \( 2\times\text{C} (4) + 4\times\text{H} (1) = 12 \).
• Lewis dot structure: Double bond between C atoms, each C bonded to 2 H, so structure is \( \text{H}_2\text{C}=\text{CH}_2 \).

Example for \( \text{CH}_3\text{NO}_2 \):

• Possible structure: \( \text{CH}_3 - \text{N}(\text{O})_2 \) (nitromethane), with a single bond between C and N, N double - bonded to two O (each O has lone pairs), and C bonded to 3 H.

Answer:

To solve these chemistry - related tasks (drawing Lewis dot structures, counting atoms, constructing molecules):

1. Lewis Dot Structures and Atom Counts:

• For \( \text{SiH}_4 \): Lewis dot structure has Si in center, 4 single bonds to H. Number of Si = 1, H = 4.
• For \( \text{SiO}_2 \): Lewis dot structure (simplified) has Si double - bonded to two O. Number of Si = 1, O = 2.
• For \( \text{H}_2\text{O} \): Lewis dot structure has O in center, 2 single bonds to H and 2 lone pairs. Number of O = 1, H = 2.

1. Molecule Construction:

• For \( \text{C}_2\text{H}_4 \): Structure is \( \text{H}_2\text{C}=\text{CH}_2 \) (double bond between C atoms, each C bonded to 2 H).
• For \( \text{CH}_3\text{NO}_2 \) (nitromethane): Structure is \( \text{CH}_3 - \text{N}(\text{O})=\text{O} \) (or with resonance, but basic structure has C - N single bond, N - O double bonds and lone pairs on O, and C bonded to 3 H).

(Note: For the actual drawing, follow the standard Lewis dot structure rules, showing bonds as lines or pairs of dots and lone pairs as dots. The atom counts are derived directly from the molecular formula.)