PLEASE LET ME PASS
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
Help!
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| Why is the first ionisation energy of potassium less than sodium? | The bigger atom is further away from the nucleus.
The inner electrons shield the outer electrons from the attraction of the nucleus
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| What is a feedstock? | The reactant from which other chemicals can be made
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| Why does a small increase in temperature produce a large increase in reaction rate? | More molecules have energy greater than the activation energy
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| What colour change would be seen by dichromate solution? | Orange to green
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| In terms of intermolecular bonding present, why does ammonia have a relatively high boiling point? | There are strong hydrogen bonds between the molecules and there is a big difference in electronegativity between nitrogen and hydrogen which makes covalent bonds very polar
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| Why does the first ionisation energy decrease going down groups? | The outer electron is further away from the nucleus and there is increased shielding by the inner electrons
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| How are ethene and propene made from the naptha fraction? | Cracking
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| Kevlar is formed from what kind of polymeridsation? | Condensation
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| What polymer can dissolve in water? | Polyethenol
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| What structure do polyester fibres have? | Linear
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| What structure do polyester resins have? | Cross linked
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| Synthesis Gas? | Carbon monoxide and hydrogen
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| Which oxide forms an aqueous solution with ph greater than7? | Sodium oxide
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| What are the two hydrogen atoms in a molecule of hydrogen held together by? | Non polar covalent bond
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| What is stronger - covalent or hydrogen? | Covalent
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| What type of bonding and structure is found in a fullerene? | Covalent molecular
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| What kind of moleculaes is carbon tetrachloride made up of? | Non-polar molecules
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Created by:
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