Lolol786
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(Not in order )
1) 5.75 (excluding anomali ) add and divide (2marks )
B) 80.34% (on the lines of that ) (3marks )
C) rate of reactions and temp - more successful collisions, frequent collisions , particles Coliding faster increasing rate of reaction (4 marks )
2) pH 7 (1 marks )
B) covalent bond ( 1 mark )
C) water has no charge hence can't carry current ( 2 marks )
D) ammonium chloride
3 180-200 kg because it's the optimum mass of fertiliser , increases profit , produces crop yield of 1900 etc less running of into river (6 marks )
4) dot and cross- 3 covalent joined pairs (2 marks )
B- nano particles are smaller than atoms - 0-100 nm (1)
C- nano particles have a larger surfaces area compared to ratio (1)
D- hydrogen is more reactive than magnesium .( 1 mark )
5) why can metels be bent and shapes - regular structure , delocalised ions , layers slide over eachother - (4 marks )
A) describe bonding inc elections in magnesium chloride - need to pairs (4) of Mg and cl . Mg has 2 elections and cl had 7 need 2 pairs .mg transfers (oxidation ) and cl receives (reduction )(4marks )
Bi) mg didkt form at neg electrode because it sank to the bottom
B) balance - 2 cl. 2 cl2 2E (1 mark )
C ) why can copper conduct electricity - deloalosed elections free to carry charge (2 marks )
7) why is diamond hard - rigid structure - strong covalent bond where 3 carbon atoms from 4 covalent bonds , layers can't slide (2 marks )
A- why would you use thermosetting instead of thermosoftening - cross links , strong bond and can widstand high temperatures (3 marks )
8 ) goes clowdy because S is formed (precipitate ) sulfur dioxide produced (2 mark )
A) improve by adding lid to prevent heat escaping or entering (2 marks )
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Meegan543210
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Magnesium ions are more reactive than hydrogen ions actually that's why they remain in solution and hence hydrogen is formed at the negative electrode
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Meegan543210
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Magnesium didn't form because it sank to the bottom but because it is more reactive than hydrogen so it stays in solution
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Meegan543210
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Diamond forms 4 covalent bonds actually (strong)
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Everydaygent
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Nanoparticles are larger than atoms.
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