chem

explain why graphite is a good conductor and soft and slippery

It is a giant covalent structure and only has three electrons with covalent bonds so one do you like last electron which can then move through the structure and carries electrical impulses so graphite can therefore conduct electricity

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Isotopes

Atoms with the same number of protons in a different number of neutrons

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Electrons and neutrons of Ga 69
31

31 electrons and 38 neutrons

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formula for gallium ion

ga3+

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Carbon is used to extract 10 from 10 oxide calculate the percentage atom economy for extracting turn this reaction

119 divided by 163 x 100 = 73%

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Two observations you can make one small piece of potassium is added to water

fizzing potassium floats

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Complete the equation for the reaction of potassium with water

2k + 2H2O --> 2KOH + H2

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Explain why the reactivity of elements changes going down group one

The outer shell is further away from the nucleus so there will be less attraction between the nucleus and the outer shell which means atoms easily lose their electrons

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Explain why sodium oxide has a high melting point

It is a giant structure which means strong forces between ions means it's harder to break part

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5.6

Fe + 14/56 + 0.25 mol 3/2x0.25+0.37524x0.375 = 9dm

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Explain my alloys are harder than pure metals

They have different atoms within them which means they can't slide over each other like normal metals

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7.2

2br ---> Br2 + 2e

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9.4

90x0.480= 4.32 4.32x250/1000 = 1.08g

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