Great paper! Remember this is my mark scheme so if your wording is not exactly that do not worry! - Rehaan
Q1: Elements Hydrogen Helium Phosphorus for XH3 Carbon or silicon for -4 oxidation state. Oxygen for final one density (not sulfur as sulfur is solid well done to whoever worked that out that's tricky).
Table NaCl/MgCl2: Does not conduct electricity when solid due to rigid repeating lattice structure. Ions in fixed position. Does conduct when molten as ions can move in solution and carry charge. High melting point as strong electrostatic force of attraction between cations (Na+ and Mg2+) and anion (Cl-) ion. More heat energy needed overcome.
SiCl4, PCl3 etc Do not conduct when solid as no delocalised electrons to carry charge. Low melting points as simple molecular compounds with relatively weak london forces and thus do not require as much heat energy to overcome forces.
Rate of H2O2 decomposition Graph drawn and tangent at t=500 Rate aprox 0.0435+ (WILL BE A RANGE) Initial concentration was 0.92 (? something like that)
Cobalt Forward reaction is endothermic as high temp means eqm shifts right and colour changes to pink
Transition Metals Fe had 3- charge with COO- And its optical isomer.
0.63% for Rhubarb. Colour change of yellow to colourless Pt had 2+ charge Mechanism was nucleophillic substitution with NH3 and Cl being pulled off platin.
First 6 marker 11.5g. Intermediate was HCl and Sn and that reacts with CH3COOCl Method to purifiy: 1. Recrystalisation 2. Add Na2CO3 to remove any HCl (as will be product of synthesis 2) 3. Filter under reduced pressure.
Kc with Moles Check amount by using pH meter and data logger to deduce pH (and so can work concentration with volume) OR titration. Can use Kc with moles as ratio - the concentrations of the reagents will be the same as the ratio of the moles at equilibrium 0.666 Ester skeletal formula:
Q1: Elements Hydrogen Helium Phosphorus for XH3 Silicon for final one density.
Table NaCl = does not conduct when solid as repeating lattice. MgCl2 = same as above. Conduct when molten as ions move in solution. SiCl4, PiCl3 etc simple molecular, weak london forces
The ratio of acid to water formed is 1:2. So you multiply number of moles of acid by 2 to get moles of water (0.04 mol I think). Then you divide 2.09 by 0.04 to get 52.3 (negative sign required, reaction is exothermic)
Q1: Elements Hydrogen Helium Phosphorus for XH3 Silicon for final one density.
Table NaCl = does not conduct when solid as repeating lattice. MgCl2 = same as above. Conduct when molten as ions move in solution. SiCl4, PiCl3 etc simple molecular, weak london forces
Maths: 0.63% -52.25 DH 0.666 Kc
I got all same as yours, but MgCl2 is also conductor in Solid state i think, bcs it has delocalised electrons that can move as mobile charged particles
Just the question about alcohol + aldehyde thing, I didn’t understand how it works i was so confused! Also the OH- adding to ketone
The ratio of acid to water formed is 1:2. So you multiply number of moles of acid by 2 to get moles of water (0.04 mol I think). Then you divide 2.09 by 0.04 to get 52.3 (negative sign required, reaction is exothermic)
Oh right ok, only one mark lost I would imagine, cheers
The ratio of acid to water formed is 1:2. So you multiply number of moles of acid by 2 to get moles of water (0.04 mol I think). Then you divide 2.09 by 0.04 to get 52.3 (negative sign required, reaction is exothermic)