What is the mass percent of oxygen (O) is SO2?

Compare and contrast physical changes with chemical changes.

Which metal exist in liquid state and can be cut with knife ?

Some familiar products contain some of the same types of atoms. for instance, the chemical formula for baking soda is nahco 3. the chemical formula for liquid bleach is naclo, and the chemical formula for table salt is nacl. which choice best describes why these three products have some of the same types of atoms in common?