Year 12s: what will be the first way you research your future options? >>

C3 edexcel 2017 unofficial mark scheme

Let's start a mark scheme ! :smile:

1) C5H11OH

ESTERS
-USED IN PERFUMES
-SWEETS
-CLOTHING

HARD WATER
2) calcium or magnesium ions
b) A was temporary - B was permanent -C was temporary and permanent

HALIDE IONS (4 MARKS)
-halides was adding dilute Nitric acid and silver nitrate to form either:
-White precipitate-chloride
-Cream-bromide
-Yellow-iodide

Ethanoic acid question
-magnesium Ethanoate and hydrogen

MATHS QUESTIONS
- 34
-0.703

MULTIPLE CHOICE
-CATALYST - INCREASES INCREASES (d I believe)
-VOLUME - chose C

The first six marker:
Mix reactants in conical flask and hydrogen gas given off and rises into syringe

Second six marker:
Molten sodium chloride-
- Sodium moves to negative cathode gains elections forms sodium atoms.
- Chlorine anions move to positive anode and oxidise to lose electrons and form chlorine atoms.
-Aqueous contained hydrogen, hydroxide, sodium, chlorine.
-Cathode product is hydrogen as it loses charge more readily than sodium and anode product was chlorine via oxidation

This is what I have so far, comment questions to discuss and get it added to the thread!

(edited 6 years ago)

Reply 1

Txhmid

for first 6 marker, 1 mol of h2 is 24 dm^3

Reply 2

Pastels123

There was a question on uses of esters wasn't there and I talked about it being used in perfumes and in sweets.

Reply 3

Armend_mehmeti

For the second six marker I mixed up the products for electrolysis of molten sodium chloride and the one in the solution ( I started to write it the right way round but crossed it out) I said all the correct points. How many marks do you think I can get ?

Thanks

Reply 4

Armend_mehmeti

For the second six maker I muddle up the electrolysis of molten sodium chloride and the electrolysis of sodichloride in a soLuton how many marks do you think I can get ?

Thanks

Reply 5

__sahar