J258 - Study guides, Class notes & Summaries

OCR GCSE (9–1) Chemistry B (Twenty First Century Science) J258/04 Depth in Chemistry (Higher Tier) QUESTION PAPER AND MARK SCHEME (MERGED)

OCR GCSE (9-1) Chemistry B (Twenty First Century Science) J258/03 Breadth in Chemistry (Higher Tier) QUESTION PAPER AND MARK SCHEME (MERGED)

OCR 2023 GCSE CHEMISTRY B TWENTY FIRST CENTURY SCIENCE J258/04: DEPTH IN CHEMISTRY (HIGHER TIER) QUESTION PAPER & MARK SCHEME (MERGED)

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

OCR GCSE (9–1) Chemistry B (Twenty First Century Science) J258/02 Depth in Chemistry (FoundationTier) QUESTION PAPER AND MARK SCHEME (MERGED)

OCR GCSE (9-1) Chemistry B (Twenty First Century Science) J258/01 Breadth in Chemistry (Foundation Tier) QUESTION PAPER AND MARK SCHEME (MERGED)

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

2 © OCR 2023 Solid sphere Dalton’s model Modern model 1 Scientists use models to represent atoms. These models have changed over time. Dalton’s model and a modern model of an atom are shown in the diagrams. (a) Give two differences between the modern model and Dalton’s model. 1 ................................................................................................................................................ ................................................................

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...

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...