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GCSE CHEMISTRY 9 TO 1 EDEXCEL PAPER 1 HIGHER TIER MAY 2025 FULL EXAM QUESTIONS AND MARK SCHEME WITH ACCURATE SOLUTIONS GRADE A+

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GCSE CHEMISTRY 9 TO 1 EDEXCEL PAPER 1 HIGHER TIER MAY 2025 FULL EXAM QUESTIONS AND MARK SCHEME WITH ACCURATE SOLUTIONS GRADE A+

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GCSE CHEMISTRY 9 TO 1 EDEXCEL
PAPER 1 HIGHER TIER MAY 2025
FULL EXAM QUESTIONS AND MARK
SCHEME WITH ACCURATE
SOLUTIONS GRADE A+
◉ Uncertainty. Answer: range / 2


◉ Relative atomic mass (Ar). Answer: sum of (isotope abundance x
isotope mass number) / sum of abundances of all isotopes


◉ Surface area to volume ratio. Answer: surface area / volume


◉ Percentage mass of an element in a compound. Answer: Ar x number
of atoms of that element / Mr of the compound x 100


◉ Number of moles. Answer: mass in g (of an element or compound) /
Mr (of the element or compound)


◉ Volume of gas (dm cubed). Answer: mass of gas (g)/ Mr of gas x 24


◉ Concentration (g/dm cubed). Answer: mass of solute (g) / volume of
solvent (dm cubed)

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