Classification of Matter: an exercise

Sample #1

Types of molecules

Only one type, PURE SUBSTANCE

Each molecule, Only one type of atoms, ELEMENT

Physical states

Gas phase

Sample #2

Types of molecules

One type, PURE SUBSTANCE, Each molecule, Two types of atoms, COMPOUND

Physical states

Gas phase

Sample #3

Types of molecules

More than one type, MIXTURE, Equal distribution, HOMOGENEOUS

Physical states

Gas phase