Tuesday 13 October 2020 - Morning AS Level Chemistry A H032/02 Depth in chemistry

Tuesday 13 October 2020 - Morning AS Level Chemistry A H032/02 Depth in chemistry ) Which of the alcohols A-F are secondary alcohols? - correct answersA secondary alcohol is a compound in which a hydroxy group, -OH, is attached to a saturated carbon atom which has two other carbon atoms attached to it In this question it is C,E and F * A student is provided with samples of three nickel compounds. One sample is nickel(II) bromide, another is nickel(II) sulfate and the third is nickel(II) carbonate. The student doesn't know which sample is which. Describe the tests that the student could carry out to identify the anion (negative ion) in each sample, and write equations for any reactions - correct answersNickel Bromide Test: add silver nitrate (AgNO3) (aq) Cream precipitate → Bromide identified Equation: Ag+ + Br- → AgBr Nickel sulphate Test: Add Ba(NO3)2(aq) OR BaCl2(aq) White precipitate → Sulfate identified Equation: Ba(NO3)2 + NiSO4 → BaSO4 + Ni(NO3) Nickel carbonate Test: Add HNO3 fizzing/ forms CO2(g) → Carbonate identified Equation: 2HNO3 + NiCO3 → Ni(NO3)2 + H2O + CO A student completely reacts 0.192g of nickel with 0.150moldm-3 HCl(aq). (i) Calculate the minimum volume, in cm3, of 0.150moldm-3 HCl(aq) that the student needs for the reaction. Give your answer to 3 significant figures - correct answers1. write an equation Ni + 2HCL- Nicl2 + H2 2. work out moles of Ni = 0.192/58.7= 3.27... × 10-3 3. work out mols of HCL Mol ratio = 1:2 = 3.27 x 10-3 x 2= = 6.54... × 10-3 (mol