The famous formula E=mc^2 really says that mass and energy are the same thing, but measured in different units. So the separate laws of conservation- one for mass and the other for energy- are now merged into one law.
Einstein's theory of special relativity (1905) shows that matter (as mass) and energy can be converted into each other according to the famous equation E = mc2, where E is energy, m is mass, and c is the speed of light.
Here are some examples of chemical properties: Reactivity with other chemicals. Toxicity. Coordination number. Flammability. Enthalpy of formation. Heat of combustion. Oxidation states. Chemical stability. HOPE THIS HELPS!
