Pure chemistry: gain knowledge for own pleasure
Applied chemistry: gain knowledge to know how to use it
The mass of Hydrogen is 2 g/mol
The mass of Helium is 4 g/mol
Pure substances are further broken down into elements and compounds. Mixture are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.
Answer:
<h2>A. Mercury's orbit is shorter than Earth</h2>
