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Task B1 The use of chemical based on their physical properties

2B. Copy the title. Task B1 The use of chemical based on their physical properties . The meanings of the key words. P4 Colour the statements that match in one colour. The meanings of the key words. The meanings of the key words. M4 Copy the title And turn into a paragraph .

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Task B1 The use of chemical based on their physical properties

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  1. 2B

  2. Copy the title Task B1The use of chemical based on their physical properties

  3. The meanings of the key words P4 Colour the statements that match in one colour

  4. The meanings of the key words The meanings of the key words

  5. M4 Copy the title And turn into a paragraph The reasons why different materials are used in mobile phones • Mobile phones contain different types of materials • Copper wiring- copper is a good conductor of electricity • Silver- used in the switch board. Silver is an even better conductor of electricity. It lasts for a long time • Gold- used to plate the surfaces of a circuit board. Excellent electrical conductor and does not corrode (wear away) • Tantalum- enables scientists to make mobile phones very small/thin

  6. Copy the title Task B2The use of chemical based on their chemical properties

  7. P5 and M4 Turn into a paragraph Some chemicals are used because of their chemical properties… Use of a chemical in welding • Chemical Name: Argon • Argon is not reactive (inert) and is very stable. • Because argon has a full outer shell of electrons (M4) • When making a metal object, you need to weld (join) the bits of metal together. • You need a lot of heat to weld • The argon is used to stop the metal parts from burning during welding Use of a chemical in Air bags • Chemical Name: Sodium azide • Airbags inflate due to a chemical reaction. They contain sodium azide. It is not reactive until it is heated up. • During a collision the airbag is heated up and the sodium azide produces sodium and nitrogen gas. • The Nitrogen gas fills the airbag • Word and symbol equation: sodium azide sodium + nitrogen 2NaN32Na (s) + 3N2 (g) • All of these chemicals are non toxic. This is important so that they don’t harm human health Use of a chemical in fire extinguishers • Chemical name: Carbon dioxide • Used in fire extinguishers. • Fire needs oxygen to burn. • Carbon dioxide contains oxygen but because it has strong covalent bonds, it doesn’t break up into carbon and oxygen easily • Carbon dioxide does not things burn. • Smothering a fire with carbon dioxide will put out the flame Use of a chemical in computer chips • Chemical name: Silicon • Is used to make the computer chips • Silicone is a semi conductor which means you can control the amount of electricity flowing through it.

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