How was reactivity discovered?

You have three 3-way switches operating 3 ceiling lights you want each switch to operate each single light What do you do? What might cause a 1995 Dodge Avenger to stall out every time you throw it into reverse? What is the most common weather in US? Pictures of separating mixtures? What are the Unifying characteristic? What substance is made up of carbon and other unburned substances along with vapors of water and acids and other chemicals? What is the black lump remaining after burning sucrose? Is density of honey more than the density of cotton? When the electric potential in a cell is in action versus a resting state the is electrical charge reversal is known as the what? How many different or states does most matter have on earth exist in? What is the difference between time capsule and time machine? What is the chemical formula of ozone? How do you calculate evaporator capacity? Which is stronger mild steel or galvanized? What is the name of a crystalline mineral light in color or translucent and easily cleavable? Why are there three different wind patterns in each hemisphere? What is an example of an atom that only exists in its molecular form? Are mackeral omnivores? A conclusion about how or why something occurs in nature supported by testing? How did Isaac Newton describe himself?