Two substances can be composed of the same chemical elements and still be different.

Question

The molecules represented below are all composed of carbon and hydrogen. But each kind of molecule makes up a different substance. These substances are different because their molecules have different numbers of carbon atoms and hydrogen atoms.
First, select the model of a molecule composed of two carbon atoms and four hydrogen atoms.

H

C



Next, select the chemical formula for the substance composed of these molecules.

Answer 1

The model of a molecule composed of two carbon atoms and four hydrogen atoms refers to the molecule ethane, which can be represented as:

   H   H
    \ /
     C
    / \
   H   C
        \
         H

This structure indicates that there are two carbon atoms (C) and four hydrogen atoms (H).

The chemical formula for this substance, ethane, is C₂H₆. However, it is possible that you are looking for a different molecule that fits the criteria of having two carbon atoms and four hydrogen atoms, but with a different structure, such as butene. If so, the correct molecular structure for two carbon atoms and four hydrogen atoms is:

C₂H₄

If the specified molecule is indeed correct as ethane, then the chemical formula would be C₂H₆. If you need to select based on conventional names or structures, please provide more context on the specific structures or options presented.