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OCR A CHEMISTRY A LEVEL PAPER 1
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30

October 2025

2025/2026

A+
OCR A CHEMISTRY A LEVEL PAPER 1 1. What are the equations for the amount of substance? A. mass = moles ÷ Mr B. mol = vol ÷ conc C. mass = Mr × moles; mol = vol × conc; vol(gas) = mol × 24 (dm³); PV = nRT D. moles = mass × Mr ________________________________________ 2. What is the Empirical Formula? A. The total number of atoms in a molecule B. The simplest whole number ratio of atoms of each element in a compound C. The molecular formula of a compound D. The number of ions ...
NjoguAmos
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Exam (elaborations)

OCR A Chemistry A Level Paper 1 Questions And Answers Verified 100% Correct
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23

July 2025

2024/2025

A+
OCR A Chemistry A Level Paper 1 Questions And Answers Verified 100% Correct Transition element - ANSWER -A d-block element that can form at least one stable ion with a partially filled d-orbital have similar physical properties (high densities + mp) have variable oxidation states cause 4s and 3d orbitals are very close in energy levels Cu and Cr are exceptions to rule that 4s subshell is filled before 3d subshell Complex ion - ANSWER -a metal ion which is su...
TopGradeGuru
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