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Chemistry :)


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
What is a feedstock? The reactant from which other chemicals can be made
Why does a small increase in temperature produce a large increase in reaction rate? More molecules have energy greater than the activation energy
What colour change would be seen by dichromate solution? Orange to green
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
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
How are ethene and propene made from the naptha fraction? Cracking
Kevlar is formed from what kind of polymeridsation? Condensation
What polymer can dissolve in water? Polyethenol
What structure do polyester fibres have? Linear
What structure do polyester resins have? Cross linked
Synthesis Gas? Carbon monoxide and hydrogen
Which oxide forms an aqueous solution with ph greater than7? Sodium oxide
What are the two hydrogen atoms in a molecule of hydrogen held together by? Non polar covalent bond
What is stronger - covalent or hydrogen? Covalent
What type of bonding and structure is found in a fullerene? Covalent molecular
What kind of moleculaes is carbon tetrachloride made up of? Non-polar molecules
Created by: abbiemxx