A scientist is working with methane (CH4) and butane (C4H10). Which statement best compares these chemicals? 1. They are two different types of molecules that each contain the same number of atoms. 2. They are two different types of atoms that are each made up of a different number of elements. 3. They are compounds made of the same two elements, but each contains different numbers of atoms. 4. They are matter made of the same two compounds, but each contains different types of elements.