Ocr gcse chemistry b - Study guides, Class notes & Summaries

OCR GCSE JUNE 2022 CHEMISTRY B J258 QUESTION PAPER 3

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. Tru...

2 © OCR 2023 1 The increase in global population means there is a greater need for drinking water. (a) What is the correct term for drinking water? Tick () one box. Ground water Potable water Sea water Waste water [1] (b) One source of drinking water is salt water. Describe a process that separates water from salt water. ................................................................................................................................................... .................

2 © OCR 2023 1 Argon forms 1% of the air and is unreactive. Argon is used as a replacement for nitrogen when nitrogen is too reactive. (a) Argon is unreactive because it is in Group 0 of the Periodic Table. State one other property of argon. .............................................................................................................................................. [1] (b) Chlorine is very reactive. Argon is unreactive. Explain how the reactivity of these two elements a...

ocr GCSE Chemistry B (Twenty First Century Science) J258-04 June2023 Mark Scheme.

This is the official question paper

ocr GCSE Chemistry B (Twenty First Century Science) J258-04 June2023 Question Paper.

GCSE Chemisty B Twenty First Century Science J258/03: Breadth in Chemistry (Higher Tier) General Certificate of Secondary Education Mark Scheme for June 2023