Markscheme Content + Mistake

Question 1

If they show another period and ask to compare the trends , what can you say if some are kinda different and dint know why

Answer 1

A bit less and don’t know why= perhaps weaker covalent bonds

A lot more and don’t know why= probably suggests some sort of covalent bonding is found

Question 2

Remember UNCERTAINTY from a burette reading

Answer 2

Requires a reading from top and bottom so two readings = twice the standard uncertainty

Question 3

For colours , and they say identify the species but it becomes a compound but you know the colour only forms in solution?

How ti write it

Answer 3

MAKE SURE TO WRITE in aqueous form, because otherwise it won’t form a colour , only when aqeuous !

Question 4

Be more specific when talking about indicators and colours in low pH and high?

Answer 4

Just mention both times that the acid reacts with A- or alklai reacting with H+

So when acidic, acid reacts, so equilibrium shift to lift (reduce h+)
When alkali, ALKLI reacts, so shift to right (to increase H+)

Question 5

Remember how to convert from g/cm3 conc to mol

Answer 5

Don’t lack, divide by fm

(Now can use appeoximation formula to find out H+ and thus pH for a weak acid if you know Ka)

Question 6

Saturated compounds can have general formula CN H2n?
HOW

Answer 6

Cyclic alkanes