What is smoke? What color is smoke? How does food coloring work? If we boil away a beaker of water with red food coloring, what happens to the food coloring? What is fire? Are there particles in fire? Why are there different colors in flame sometimes? What about fireworks? How does a candle burn? What are candles made of? What happens to the wax particles after the candle burns? What is air? What happens to the gas particles in air when something burns? What is incense? Why do some people have a reaction to some particles that they smell (ex. Perfume). What is the difference between a particle, an atom, a molecule, subatomic particle? Explain. What is particle board? Why is it called particle board? How do you make rock candy? How does making rock candy fit into what we are studying? Tell us more about Joseph Priestly.