Question

activity a (continued from previous page)

1. practice: write the formula for each molecule shown below. then, check your work by creating the molecule in the gizmo and writing the formula. (dont worry too much about the order of elements in the formula for now.)

formula: __ formula: formula: __

1. practice: under mode, select build from formula. check that simple molecules are selected. turn on show lewis structure. a lewis structure is a diagram that shows the 2d structure of the molecule.

each time you complete a molecule, click check. list the full name of each molecule below. select show 3d structure to view what the molecule really looks like in three dimensions.
cl₂: ______ o₂: ____ n₂: ____ h₂o: ______
nh₃: ______ co₂: ____ ch₄: ____ c₃h₈: ______

1. extend: molecules that contain c - h bonds are called organic compounds. most organic compounds are produced by living things. look at the lewis structure of the organic compound propane, c₃h₈. based on the structure of propane in the gizmo, what do you think is the structure of butane, c₄h₁₀? draw a picture below, then see if you are correct using the free build mode of the gizmo.

c₄h₁₀
methane, propane, and butane are all examples of hydrocarbons. as the name implies, hydrocarbons are made of hydrogen and carbon. many fuels are hydrocarbons.

1. infer: of the elements you can see in this gizmo, which element would you choose to form the inner structure, or \skeleton,\ of a complicated molecule? explain your choice.

________________________
________________________
________________________

Explanation:

Step1: Identify atoms in each molecule

• First molecule: Two hydrogen atoms.
• Second molecule: One sulfur atom and two chlorine atoms.
• Third molecule: One nitrogen atom, one hydrogen atom and one oxygen atom.

Step2: Write formulas

• For two hydrogen atoms: \(H_2\)
• For one sulfur and two chlorine: \(SCl_2\)
• For one nitrogen, one hydrogen and one oxygen: \(HNO\)

Answer:

\(H_2\), \(SCl_2\), \(HNO\)