2017 Paper 1 Mistakes Flashcards
Remmeber for finding isotopes what to always do
Ignore everything, just look at protons and match those
Remember cr 3+ with excess sodium hydroxide is always? (Even if not in sqaure brackets)
Always complex ion with 6 Oh, don’t need square
When drawing out ions so you can see shape, what to always do if there a + or - charge
If there’s a minus charge add an electron, if there’s a + charge REMOVE it
Now say the lone pairs bonding pairs and then work out!
So NH4+ is because one electron is lost, NH2 - will have two lone pairs bevause one electron is added
In terms of entropy what takes more precedence, state change of moles?
How to say why entropy is increase
ALWAYS STATE CHANGE, so if it went from liquid to solid, this is more effect then 2 to 3 moles
Went to solid, less energy is dispersed in the chemical system
Or more moles, means more energy dispersed that’s it
ATOMISATION DEFINTION IS FORMING 1 MOL OF GASOEUS ATOMS, therefore what always must be on the right
Must always be 1 mol, so if it’s chlorine must be 1/2 on the left, don’t lack!!,
Always go back to defintion
When Gibbs = 0 what is this point referred to if you have to explain
Either the min temperature at feasible OF THE POINT AT WHICH FEASIBILITY CHANGES
In General Act like Gibbs is feasible at 0 gibbs
Just like physics if have to compare grefient, show excsclty what Esch part means and don’t hold back
Line them up and SAY EXACTLY WHAT IT MEANS
Rememebr KP FOR GASES AND KC CONDITONS
They lit told you it’s hetergounsshould’ve clocked
Ke only gases
Ke only aqueous and gases
Never liquids or solids
When finding enthalpy changes, don’t need to use hess
Just do enthalpy change is product - read that
It says indicate the scale of working what does this mean?
Just means the max , so like 1 litre jug etc.
Just go with what you think, there are 1 litre cylinders and can say @ litre gas syringe no problem
In terms of cyclinderwhat must you say
MEASURING CYLINDER, cantjus say cylinder alone
Le chattier question how to condense
Don’t need to explain ke chstllier, jus say BY LE CHATTELIER goes this way thst way
- then just explain why (moles, temp)
Why would factory alter their condtions even if not give them optimal?
For pressure low and high temps exact wording
Low pressure leads to low rate
High temperature uses TOO MUCH ENERGY
If they give you kc, and volume, and moles , how to find out moles of a third?
Jus use kc equation amd rearrange domt overthink
With two weak acids, the stringer weak acid will do what to do weak
Stringer weak acid will act as an acid and weaker as base
