AS Depth chemistry paper H032/02

AS Depth chemistry paper H032/02 A portable heater is lit to heat a room The heater burns 600g of butane and consumes 1.50m3 of O2, measured at room temperature and pressure determine whether this portable heater is safe to use show all of your working - correct answersn of butane = 600/58.0 = 10.34mol n(O2 required) = 6.5x10.34 = 67.2mol n(O2 consumed) = 1.50x10^3/24.0 = 62.5mol conclusion with reason: incomplete combustion not safe to use 62.567.2 Alkane X can also be used a fuel complete combustion of 0.0117mol of X produces 2.00x10^-3mol3 of carbon dioxide gas measured at 24.0degrees and 101kPa determine the molecular formula of X Show all of your working - correct answersPv=nRT n= (101x10^3) x (2.00x10^-3) / 8.314 x 297 n= 0.0818mol/0.0117 = 7 C7H16 CH3CH2CH2CH=CH2 Pent-1-ene doesn't not show stereoisomerism explain why - correct answersOne of the carbons In the C=C has the same two groups bonded, so cannot form stereoisomers describe how a sigma bond forms - correct answerssideways overlap of the orbitals between the bonding atoms Heterogenous catalyst - correct answerscatalyst that is in a different state than the reactants Name the apparatus that the student should use to: - Make up the acid solution to 250.0cm3 -measure the 25.0cm3 portion of acid solution - correct answersvolumetric flask graduated pipette Predict the type of structure and bonding of SO2 and MgO and explain the difference in their melting points - correct answersSO2 has covalent bonding and forms a simple molecular lattice MgO has ionic bonding and forms a giant ionic lattice MgO has a higher melting point than SO2 due to the strength of the ionic bond compared to intermolecular bonds in SO2. MgO requires more energy to overcome/break than SO2's intermolecular forces