What material is made by heating a mixture of sand, limestone and sodium carbonate? Soda-lime glassConcreteClay ceramicsBorosilicate glass2Which of the following statements about composites is not true? They are usually made of two materials, with one material acting as a binder for the otherThey make a product with improved properties that neither material could provide aloneFibreglass is a composite of glass and metalConcrete is a composite of cement, sand and gravel mixed with water3What reaction conditions are needed to form low density poly(ethene)? Low pressure, presence of oxygenCatalyst at 50°C, slightly raised pressureHigh pressure, presence of oxygenHigh pressure, catalyst4Which type of polymer melts easily and can therefore be remoulded? CompositeThermosofteningThermosettingThermomelting
Question
What material is made by heating a mixture of sand, limestone and sodium carbonate? Soda-lime glassConcreteClay ceramicsBorosilicate glass2Which of the following statements about composites is not true? They are usually made of two materials, with one material acting as a binder for the otherThey make a product with improved properties that neither material could provide aloneFibreglass is a composite of glass and metalConcrete is a composite of cement, sand and gravel mixed with water3What reaction conditions are needed to form low density poly(ethene)? Low pressure, presence of oxygenCatalyst at 50°C, slightly raised pressureHigh pressure, presence of oxygenHigh pressure, catalyst4Which type of polymer melts easily and can therefore be remoulded? CompositeThermosofteningThermosettingThermomelting
Solution
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The material made by heating a mixture of sand, limestone, and sodium carbonate is Soda-lime glass.
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The statement about composites that is not true is "Fibreglass is a composite of glass and metal". Fiberglass is actually a composite of glass fibers and a polymer.
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The reaction conditions needed to form low density poly(ethene) are "Catalyst at 50°C, slightly raised pressure".
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The type of polymer that melts easily and can therefore be remoulded is Thermosoftening.
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