1-When it comes to combustion, why is it important to understand the phases of a fuel (whether the fuel is in the gas, liquid or a solid) important?
2-The properties of material will change when it undergoes either a physical or chemical change. What is the difference between physical and chemical changes?
3-What is the effect of temperature on the rate of chemical change?
4-What is the molecular difference between a gas, a liquid, and a solid?