Methanol (CH₃OH) was historically produced by destructive distillation of wood, hence called wood alcohol. Ethanol is grain alcohol (from fermentation). Rubbing alcohol is isopropanol or denatured ethanol. Denatured alcohol is ethanol with added methanol or other substances to make it undrinkable. Methanol is toxic, used as solvent, fuel, and antifreeze.
Explanation:
Hydrogen has about 141.9 kJ/g, the highest of any fuel. Methane ~55.5 kJ/g, coal ~25-35 kJ/g, wood ~17 kJ/g. Hydrogen produces only water on combustion, making it a clean fuel.
Explanation:
Teflon (PTFE) has a very low coefficient of friction and high heat resistance, making it ideal for non-stick coatings. Polystyrene is used in packaging, polyethylene in plastic bags, nylon in textiles and ropes. Teflon's monomer is tetrafluoroethene.
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