a scientist is working with methane (ch4) and butane (c4h10). which statement best compares these chemicals?
they are two different types of molecules that each contain the same number of atoms.
they are two different types of atoms that are each made up of a different number of elements
they are compounds made of the same two elements, but each contain different numbers of atoms
they are matter made of the same two compounds, but each contain different types of elements.

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# Brief Explanations:
- Methane ($CH_4$) and butane ($C_4H_{10}$) are both compounds. A compound is a substance formed when two or more elements are chemically bonded together. Here, the two elements are carbon ($C$) and hydrogen ($H$).
- For methane ($CH_4$): The number of atoms is $1 + 4=5$ (1 carbon atom and 4 hydrogen atoms).
- For butane ($C_4H_{10}$): The number of atoms is $4 + 10 = 14$ (4 carbon atoms and 10 hydrogen atoms). So they have different numbers of atoms.

Let's analyze each option:
- Option 1: Methane has 5 atoms ($1C + 4H$) and butane has 14 atoms ($4C+10H$). So, they do not have the same number of atoms.
- Option 2: Methane and butane are molecules (made up of atoms), not atoms themselves.
- Option 3: Correct as explained above.
- Option 4: They are compounds made of elements (not compounds made of compounds). Also, they have the same types of elements ($C$ and $H$).

# Answer:
They are compounds made of the same two elements, but each contain different numbers of atoms.

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