Why is steel harder than Iron?

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How do you find the molecular formula of a polymer? are polymers weaker or stronger than ionic bonds? what type of structure does diamond have? How are the repeating units in a polymer bonded together? At room temperature most Polymers are in what state? Why are diamonds are hard? Why is graphite electrically conductive? Which fullerene was the first to be discovered? What is a fullerene? Why are most metals are malleable? What do diamond and graphite have in common? What is a giant covalent structure? Are alkanes or alkenes used in the production of polymers? Why can alkanes not be used to make polymers? Name the first four alkanes. Name the first four alkenes. How are longer hydrocarbons cracked? In a test for alkenes the bromine water is added and the colour does not change, is an alkene present? How is the demand for smaller chain hydrocarbons met? Define polymer. Explain why the structure of alkenes helps them to form polymers. Define homologous series. What is the name of the repeating units that make up a polymer? Name one property of PVC. Name one property of Polypropene. Name one property of polyethene. Give one use of Polyethene. Give one use of Polypropene. Give one disadvantage of using landfill to dispose of polymers. Give one advantage of using incineration to dispose of polymers. Give one disadvantage of using incineration as a method of disposing of polymers. Give one advantage of using recycling to dispose of polymers. Give one disadvantage of using recycling to dispose of polymers.