Everything is made of atoms. Atoms are bonded together to make compounds. Atoms are “pure” substances and compounds are combinations of these pure substances. Atoms are made of three parts, Protons, Neutrons and Electrons. The Protons and Neutrons are located in the nucleus of the atom. The Electrons are orbiting around the nucleus. When to atoms bond, electrons are given from one atom to another. Sodium Chloride (Salt) is made of Sodium and Chlorine. The Sodium gives the Chlorine it’s lone electron and becomes positively charged. The Chlorine is negatively charged.
Another Chemical reaction is the burning of Magnesium to make Magnesium Oxide.
Mg + O2 -> MgO
Silver Solid + Colorless gas + Heat -> White Powdery Substance.
Magnesium burns brightly to form Magnesium Oxide. The light is used in fireworks to make them bright. Once the Magnesium is burnt into Magnesium Oxide, it is nearly impossible to rip the Oxygen atoms off and make pure Magnesium.
Difficult, But not impossible.
IF ATTEMPTING THIS EXPERIMENT, DON'T LOOK AT THE BURNING MAGNESIUM DIRECTLY. YOU MAY BE BLINDED.