Edexcel igcse chemistry paper 2 2017

2C or 2CR?

How likely do you guys think it is that the manufacture of sulfuric acid will come up?

possible,as it rarely comes up

anyone working on a mark scheme?

electrolysis: Very little in paper 1 so there will probably be a q and it'll be on electrolysis of solutions. Equilibrium: Was a q in paper 1 so there will not be much in paper 2, if it appears i'm guessing it'll be about dynamic equilibrium. Organic: Q in paper 1 on mainly alkane/alkene & polymers. So q in paper 2 may focus on alcohols and working out empirical formula. You also haven't yet been testing on difference between alkene + br2 & alkane + br2 calculations: These will definitely appear in paper 2 - due to those in paper 1 i think the focus will be on solution gas calculations. There might also be a relative atomic mass calc early on in the paper too. Chemical tests: There were a lot of these in paper 1 so i doubt there will be many more. Bonding: Very little in paper 1 so will appear in paper 2 - guess will be ionic vs covalent comparison probably including giant covalent. (from my teachers)

unofficial markscheme??
Q1a) 4 elements
Q1b)
Q1c) first and last options
Q1d) [Relative atomic mass] 28.1
Q1e) last option- 3 periods 8 groups Q1f) [Noble gases] 2- Ar and He

Q2a)
Q2b) [Why is lead compound heated] So the ions can move Q2c) [What gases are formed] -= Chlorine and Oxygen, +=Hydrogen Q2d) [Give ionic half equations] 2Cl- > Cl2 + 2e, 2H+ + 2e > H2, 4OH- > 2H2O + O2 + 4e Q2e) Q2f) [Mass of copper] 1.27g

Q3a)
Q3b) [Dot and cross] 7 dots around each F, 4 dots and 4 crosses around Si
Q3c) [Why is SiCl4 higher b.p.]
Q3d) [Why is SiO3 much higher]

Q4a) [Explain which are hydrocarbons] A,B,C bc they only have hydrogen and carbon atoms
Q4b) [Which is a displayed formula] B bc it shows all bonds between atoms
Q4c)
Q4d) [Deduce the name of D] Butene
Q4e) [Colour of solution] Colourless
Q4f)
Q4g) [What is PVC] Polyvinyl chloride
Q4f) [Draw displayed formulae of chloroethene and poly(chloroethene)]

Q5a)
Q5b) [Why is deltaT lower] Heat loss to atomosphere, lack of insulation
Q5c) [Molar enthalpy charge] -403
Q5d) [Things wrong about methane graph] CO2 + H2O should be lower, reaction is exothermic, time/ x axis not labelled, deltaH not labelled
Q5e) [Actual enthalpy charge] -535

here are some of my answers. for q2b do you mean it is heated so ELECTRONS are free to move?. i also had 5.08g for 2F mass of copper. really not sure. i defo agree with some though. i remeber a questions asked what type of particles flow through the wires, i said electrons. i also see you said oxygen formed but you have written the OH- equation i think it should be 2O2- ---> 02 + 2E-.. dont take my word for everything

For your electrolysis half equation for oxygen it's +4e- no 2e

unofficial markscheme??
Q1a) 4 elements
Q1b)
Q1c) first and last options
Q1d) [Relative atomic mass] 28.1
Q1e) last option- 3 periods 8 groups Q1f) [Noble gases] 2- Ar and He

Q2a)
Q2b) [Why is lead compound heated] So the ions can move Q2c) [What gases are formed] -= Chlorine and Oxygen, +=Hydrogen Q2d) [Give ionic half equations] 2Cl- > Cl2 + 2e, 2H+ + 2e > H2, 4OH- > 2H2O + O2 + 4e Q2e) Q2f) [Mass of copper] 1.27g

Q3a)
Q3b) [Dot and cross] 7 dots around each F, 4 dots and 4 crosses around Si
Q3c) [Why is SiCl4 higher b.p.]
Q3d) [Why is SiO3 much higher]

Q4a) [Explain which are hydrocarbons] A,B,C bc they only have hydrogen and carbon atoms
Q4b) [Which is a displayed formula] B bc it shows all bonds between atoms
Q4c)
Q4d) [Deduce the name of D] Butene
Q4e) [Colour of solution] Colourless
Q4f)
Q4g) [What is PVC] Polyvinyl chloride
Q4f) [Draw displayed formulae of chloroethene and poly(chloroethene)]

Q5a)
Q5b) [Why is deltaT lower] Heat loss to atomosphere, lack of insulation
Q5c) [Molar enthalpy charge] -403
Q5d) [Things wrong about methane graph] CO2 + H2O should be lower, reaction is exothermic, time/ x axis not labelled, deltaH not labelled
Q5e) [Actual enthalpy charge] -535

Thanks. I think Q4d is incorrect. The right answer should be 2,3 dibromobutane.