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Science Materials

What is a material ? a material is a substance that can be used to make things, e.g rubber, paper, glass. Different materials are used for difficult purposes depending on their properties.
What is a polymer ? a polymer is a string of many small units,called monomers.
What is a co-polymer? there may be thousands of monomers in a single chain. a chain can also be formed by combining different monomers. in this case the product is called a co-polymers.
What are some natural and man-made polymers ? some natural polymers are wool, cotton, cellulose, hair and silk, and some man-made polymers are PVC, araldite and tefron.
What are linear polymers ? linear polymers are attracted to each other and also tangle together. the attraction between the chains can be overcome by heat, causing the polymers to melt
What are cross-links and what effect does it have on a polymer? some polymers have bands between the chains. cross-links hold the chains in place so they cant untangle even when heated
What will result when a few cross-links hold a polymer ? few cross-links will result in an elastomer
What will result when an intermediate amount of cross-links hold a polymer ? an intermediate amount of cross-links will result in a a flexible solid
What will result when a large amount of cross-links hold a polymer ? a large amount of cross-links will result in a a rigid polymer
Do cross-linked polymers melt when heated? no, they do not melt. but a polymer with no cross links does melt when heated
What are five properties of metals? conducts heat and electricity well, they are strong, malleable, ductile, shiny, can be polished, high melting and boiling point and lose electrons easily to become metal compounds i.e corrodes
What is work hardening ? work hardening makes the metal stronger but more brittle e.g the paper clip
What is annealing and what effect does it have on the metal ? annealing is heating the metal and cooling it slowly which makes the metal softer and easier to shape.
What is quenching and what effect does it have on the metal ? quenching is when a metal is heated and cooled rapidly which makes the metal stronger but more brittle
What is tempering and what effect does it have on the metal ? tempering is when you quench the metal then anneal it which reduces the brittleness of the metal but maintains some of the strength
Why do metals corrode to form ionic compounds? they corrode to form ionic compounds because they lose electrons easily
What could you coat a metal to stop it from corroding and getting oxygen reaching it? paint, oil, plastic, another metal - less reactive e.g chrome or more reactive e.g Zn which resists further corrosive.
What is alloying ? alloying is mixing metals to get an alloy
What is thermosetting ? a substance that set permanently when heated
What id thermo plastic ? a substance that becomes plastic when heated and hardened on cooling and are able to repeat these processes
Created by: linda.x