OCR 2023 Chemistry A H432/03: Unified chemistry A Level Question Paper & Mark Scheme (Merged)

2 OCR 2023 1 This question is about the first 36 elements in the periodic table: H He Li Be B C N O F Ne Na Mg Al Si P S Cl Ar K Ca Sc Ti V Cr Mn Fe Co Ni Cu Zn Ga Ge As Se Br Kr From these 36 elements only, write the symbol for the element(s) that fit each description. (a) The three elements that, when in a molecule, can form hydrogen bonds with other suitable molecules. .......................................................... [1] (b) The element in Period 2 with the successive ionisation energies shown below. Ionisation number 1st 2nd 3rd 4th 5th 6th 7th 8th Ionisation energy /kJmol– ................... [1] (c) An element that is a solid at RTP with a simple molecular lattice structure. ................... [1] 3 Turn over (d) The two elements with atoms containing five unpaired electrons. . ..................................... [2] (e) The element in Period 3 that exists in the solid state as a network of atoms bonded by strong covalent bonds. ................... [1] (f) The p-block element in Period 3 that forms a compound with fluorine with octahedral molecules. ................... [1] (g) The element that forms 1– ions most readily. (h) The element with an average atomic mass of 1.244