Chemistry- C2.A 0.0 / 5 ? ChemistryC2.AGCSEAQA Created by: lturner17Created on: 12-02-17 14:55 The mass number is? Total number of protons and neutrons. 1 of 29 The atomic number is? Number of protons. 2 of 29 What are the masses of protons, neutrons and electrons? 1,1, 1/2000. 3 of 29 What is an isotope? Different atomic forms of the same element. Same number of protons but a different number of neutrons. 4 of 29 Example of an isotope? Carbon 12 and carbon 14 5 of 29 What is ionic bonding? When atoms lose or gain elections to form ions. 6 of 29 What is covalent bonding? The sharing of electrons. 7 of 29 Why is diamond hard? What structure is it? Each carbon atom has 4 covalent bonds. Giant covalent structure. 8 of 29 Why is graphite soft and slippery? Each carbon atom has 3 covalent bonds which creates layers which slide over teacher other. 9 of 29 What else is silicon dioxide called? Silica 10 of 29 How are alloys stronger? Different sized atoms distort the layers of metal atoms, so they can't slide over each other. 11 of 29 What it nitinol? Give a use for it Memory shape alloy. When its cool you can bend it, heat it and it will go back to original shape. Example= braces 12 of 29 Nanoparticles include fullerenes. What are fullerenes? Molecules of carbon shaped like hollow balls or closed tubes 13 of 29 What are nanotubes and why are they strong? Fullerenes tuned to form hollow carbon tubes. Lots of double bonds make them strong 14 of 29 Why are nanoparticles useful for industrial catalysts? Huge S.A to volume ratio. 15 of 29 Why are they good for sensors? Can detect 1 type of molecule so they are precise. 16 of 29 Why are they good for sun cream and deodorant? Don't leave white marks 17 of 29 Why are they good for medicine? Absorbed quickly and easily into the body so they go to the correct cells 18 of 29 Why are they good for electric circuits? They conduct electricity 19 of 29 What things would need lubricant coating made from from fullerenes? Artificial joints and gears 20 of 29 Describe thermosoftening polymers? Individual tangles chains with intermolecular forces. No cross chains so easy to melt. You can remould lots of times. 21 of 29 Describe thermosetting polymers? Strong intermolecular forces with crosslinks. Solid structure don't soften when heated. Strong, hard and rigid. 22 of 29 How is low density polythene made? High temperatures and pressure 23 of 29 How is high density polythene made? Lower temperatures and pressure 24 of 29 What is the relative atomic mass? The top number. Its mass compared to carbon- 12 25 of 29 What is the relative formula mass? All the atomic masses added 26 of 29 How do you work out the number of moles? Mass / relative formula mass 27 of 29 How do you calculate the percentage mass? Ar X no. of atoms / Mr 28 of 29 How do you find the empirical formula? Experimental masses / Ar Then put in a ratio 29 of 29
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