Final answer:
In fireworks, gunpowder, black powder, and flash powder require oxygen molecules for combustion, but sparklers do not.
Step-by-step explanation:
In fireworks, the materials that require oxygen molecules to support combustion are gunpowder, black powder, and flash powder. Gunpowder is composed of charcoal, sulfur, and saltpeter (potassium nitrate), and the potassium nitrate provides the extra oxygen needed for a rapid reaction. Black powder is a type of gunpowder and also requires oxygen for combustion. Flash powder, which is used in fireworks for its bright burst of light, also requires oxygen for combustion.
However, sparklers do not require oxygen molecules to support combustion. Sparklers are made from a metal wire that is coated with a mixture of chemicals, including a metal fuel and an oxidizer. The metal fuel provides the necessary heat and energy for the sparkler to burn, and the oxidizer, such as potassium nitrate or potassium chlorate, provides the oxygen needed for combustion.