OCR 2023 GCSE CHEMISTRY B TWENTY FIRST CENTURY SCIENCE J258/02: DEPTH IN CHEMISTRY (FOUNDATION TIER) QUESTION PAPER & MARK SCHEME (MERGED)

2 © OCR 2023 1 Poly(ethene) is a polymer which forms when ethene monomers react together in an addition polymerisation reaction. The structure of an ethene monomer and the repeating unit of poly(ethene) are shown in Fig. 1.1. Fig. 1.1 H H H H C C C C H H H H Ethene monomer Repeating unit of poly(ethene) (a) Which statements are true only for an ethene monomer, which are true only for the repeating unit of poly(ethene) and which are true for both? Tick () one box in each row. True only for an ethene monomer True only for the repeating unit of poly(ethene) True for both Contains a double bond Contains a single bond Contains covalent bonds Represents a molecule with a long chain structure [4] (b) PVC is another addition polymer. The structure of the repeating unit of PVC is shown in Fig. 1.2. Fig. 1.2 H Cl C C H H Draw the structure of a monomer of PVC. [1] n n 3 © OCR 2023 Turn over HCl NH3 H2 CO2 2 Models are used to represent the structure of com