Ocr gcse chemistry b - Study guides, Class notes & Summaries
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OCR GCSE (9-1) Chemistry B (Twenty First Century Science) J258/01 Breadth in Chemistry (Foundation Tier) QUESTION PAPER AND MARK SCHEME (MERGED)
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OCR 
 
GCSE (9-1) Chemistry B 
(Twenty First Century Science) 
 
J258/01 Breadth in Chemistry (Foundation Tier) 
QUESTION PAPER AND MARK SCHEME (MERGED)
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OCR 2023 GCSE CHEMISTRY B TWENTY FIRST CENTURY SCIENCE J258/02: DEPTH IN CHEMISTRY (FOUNDATION TIER) QUESTION PAPER & MARK SCHEME (MERGED)
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OCR 
2023 
 
GCSE 
CHEMISTRY B TWENTY FIRST CENTURY SCIENCE J258/02: DEPTH IN CHEMISTRY (FOUNDATION TIER) 
 
QUESTION PAPER & MARK SCHEME (MERGED)
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ocr GCSE Chemistry B (Twenty First Century Science) (J258/04) QUESTION PAPER AND MARK SCHEME June2023.
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ocr GCSE Chemistry B (Twenty First Century Science) (J258/04) QUESTION PAPER AND MARK SCHEME June2023.
ocr GCSE Chemistry B (Twenty First Century Science) (J258/04) MARK SCHEME June2023.
ocr GCSE Chemistry B (Twenty First Century Science) (J258/04) QUESTION PAPER June2023.
(J258/04) QP AND MS
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ocr GCSE Chemistry B (Twenty First Century Science) J258/04 Question Paper and Mark Scheme June2023.
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ocr GCSE Chemistry B (Twenty First Century Science) J258/04 Question Paper and Mark Scheme June2023.
ocr GCSE Chemistry B (Twenty First Century Science) J258/04 Mark Scheme June2023.
ocr GCSE Chemistry B (Twenty First Century Science) J258/04 Question Paper June2023.
J258/04 QP and MS
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ocr GCSE Chemistry B (Twenty First Century Science) J258/03 Question Paper and Mark Scheme June2023.
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ocr GCSE Chemistry B (Twenty First Century Science) J258/03 Question Paper and Mark Scheme June2023.
ocr GCSE Chemistry B (Twenty First Century Science) J258/03 Mark Scheme June2023.
ocr GCSE Chemistry B (Twenty First Century Science) J258/03 Question Paper May2023.
J258/03 QP and MS
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OCR GCSE (9−1) Chemistry B (Twenty First Century Science) (J258-01) Breadth in Chemistry (Foundation Tier)
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OCR GCSE (9−1) Chemistry B (Twenty First Century Science) (J258-01) Breadth in Chemistry (Foundation Tier)
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OCR gcse chemisty b twenty first century science j258/01: breadth in chemistry (foundation tier) mark scheme for june 2023
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OCR gcse chemisty b twenty first century science j258/01: breadth in chemistry (foundation tier) mark scheme for june 2023
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OCR 2023 GCSE CHEMISTRY B TWENTY FIRST CENTURY SCIENCE J258/04: DEPTH IN CHEMISTRY (HIGHER TIER) QUESTION PAPER & MARK SCHEME (MERGED
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© 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 ................................................................................................................................................ 
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OCR 2023 GCSE CHEMISTRY B TWENTY FIRST CENTURY SCIENCE J258/02: DEPTH IN CHEMISTRY (FOUNDATION TIER) QUESTION PAPER & MARK SCHEME (MERGED)
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© 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...
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OCR 2023 GCSE CHEMISTRY B TWENTY FIRST CENTURY SCIENCE J258/03: BREADTH IN CHEMISTRY (HIGHER TIER) QUESTION PAPER & MARK SCHEME (MERGED
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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...
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