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OCR A-Level Chemistry Foundations in Chemistry | 140+ Exam Questions & Answers | Atomic Structure, Bonding, Redox, Acids, Titrations & Calculations | OCR

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Master OCR A-Level Chemistry Foundations in Chemistry with this comprehensive revision guide featuring 140+ exam-style questions and answers covering the essential concepts from Module 2: Foundations in Chemistry in the OCR A Chemistry specification. Organised in a structured question-and-answer format, this resource is designed to strengthen active recall, reinforce scientific understanding, and improve examination performance through concise definitions, worked calculations, laboratory methods, and examiner-focused explanations. It is an excellent study companion for independent revision, classroom learning, mock examinations, and final A-Level preparation. This revision guide provides extensive coverage of Foundations in Chemistry, including atomic structure, isotopes, relative isotopic mass, relative atomic mass, relative molecular mass, Avogadro constant, the mole, empirical and molecular formula calculations, percentage yield, atom economy, ideal gas equation (PV = nRT), water of crystallisation, hydrated and anhydrous compounds, electron configuration, atomic orbitals, s and p subshells, ionic bonding, covalent bonding, dative covalent bonding, giant ionic lattices, giant covalent structures, metallic bonding, intermolecular forces, London dispersion forces, permanent dipole–dipole interactions, hydrogen bonding, electronegativity, molecular shapes, VSEPR theory, bond angles, oxidation numbers, redox reactions, oxidising and reducing agents, Brønsted–Lowry acids and bases, strong and weak acids, alkalis, neutralisation reactions, titration techniques, preparation of standard solutions, volumetric analysis, carbonate analysis, electron pair repulsion theory, and the physical properties of ionic, covalent, and molecular substances. Each question is paired with concise, exam-focused answers that reinforce both theoretical understanding and practical chemistry skills required for OCR A-Level examinations. This study guide is particularly valuable for students preparing for OCR A-Level Chemistry Module 2 assessments, Paper 1 (H432/01), mock examinations, end-of-topic tests, final A-Level examinations, and university entrance examinations. It is equally suitable for students transitioning from GCSE Chemistry, independent learners, tutor-led revision sessions, classroom teaching, and applicants to Chemistry, Medicine, Dentistry, Pharmacy, Veterinary Science, Biomedical Science, Chemical Engineering, Natural Sciences, Materials Science, and other STEM degree programmes, where a strong understanding of core chemical principles is essential. The content aligns with the OCR A Level Chemistry A (H432) Specification and reflects concepts presented in authoritative academic references, including the OCR A Level Chemistry A Specification (OCR), Ritchie, R., & Gent, M. OCR A Level Chemistry Student Book 1 (Oxford University Press), Atkins, P., & de Paula, J. Atkins' Physical Chemistry (Oxford University Press), Housecroft, C. E., & Sharpe, A. G. Inorganic Chemistry (Pearson), Brown, T. L., LeMay, H. E., Bursten, B. E., et al. Chemistry: The Central Science (Pearson), and the IUPAC Compendium of Chemical Terminology (Gold Book), all internationally recognised references supporting advanced chemistry education and OCR examination preparation. Relevant Students: OCR A-Level Chemistry students, Year 12 Chemistry students, Sixth Form students, College Chemistry students, GCSE to A-Level Chemistry transition students, Foundation Year Chemistry students, A-Level Chemistry examination candidates, Chemistry tutors, Science teachers, university applicants for Chemistry, Medicine, Dentistry, Pharmacy, Veterinary Science, Biomedical Science, Chemical Engineering, Natural Sciences, Materials Science, and STEM students building a strong foundation in chemistry. Keywords OCR A-Level Chemistry, OCR Chemistry Module 2, Foundations in Chemistry, OCR Revision Notes, A-Level Chemistry Questions and Answers, Atomic Structure, Isotopes, Relative Atomic Mass, Relative Molecular Mass, Avogadro Constant, Mole Calculations, Empirical Formula, Molecular Formula, Percentage Yield, Atom Economy, Ideal Gas Equation, Water of Crystallisation, Electron Configuration, Atomic Orbitals, Ionic Bonding, Covalent Bonding, Dative Covalent Bonding, Metallic Bonding, Giant Ionic Lattice, Giant Covalent Structure, Intermolecular Forces, London Dispersion Forces, Hydrogen Bonding, Permanent Dipole Dipole Forces, Electronegativity, Molecular Shapes, VSEPR, Bond Angles, Oxidation Numbers, Redox Reactions, Acids and Bases, Brønsted Lowry, Strong Acids, Weak Acids, Alkalis, Neutralisation, Titration, Standard Solutions, Volumetric Analysis, Carbonate Analysis, Chemistry Exam Preparation

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OCR A level chemistry-
Foundations in Chemistry

Define an isotope - ANSWER ✔✔Atoms of the same element with

different numbers of neutrons but the same number of protons and

electrons


what does the term "relative isotopic mass" mean? - ANSWER

✔✔the mass of an isotope relative to 1/12th of the mass of an atom of

Carbon-12


what does the term "relative atomic mass" mean? - ANSWER ✔✔is

the weighted mean mass of an atom of an element relative to 1/12th of

the mass of an atom of carbon-12

,what does the term "relative molecular mass" mean? - ANSWER

✔✔is the weighted mean mass of a molecule relative to 1/12th of the

mass of an atom of carbon-12


What is the atomic number - ANSWER ✔✔number of protons


what is the atomic mass - ANSWER ✔✔Number of protons and

neutrons


define "the mole" - ANSWER ✔✔one mole is the amount of

substance that contains 6.02x10^23 particles

state the formula linking moles, mass and molecular mass -

ANSWER ✔✔moles = mass divided by molecular mass


what are the charges of: Al, Ag, and Zn - ANSWER ✔✔Al= 3+


Ag= +

Zn= 2+


Charges and masses of protons, neutrons, and electrons - ANSWER

✔✔PROTON CHARGE= +1


ELECTRON CHARGE= -1

NEUTRON CHARGE= 0

, PROTON RELATIVE MASS= 1

ELECTRON RELATIVE MASS= 1/2000

NEUTRON RELATIVE MASS= 1


Name all of the diatomic elements - ANSWER ✔✔Bromine, Iodine,

Nitrogen, Chlorine, Hydrogen, Oxygen, Fluorine


polyatomic ions - ANSWER ✔✔- carbonate, CO3^2-


- ammonium, NH4+

- nitrate, NO3-

- nitrite, NO2-

- sulfate, SO4^2-


What is Avogadro's constant? - ANSWER ✔✔6.02 x 10^23 mol the

number of particles in each mole. to find number of atoms, fine number

of moles and x by constant (same for molecules but using Mr of whole

molecule to find moles)


state the equation for percentage yield? - ANSWER ✔✔percentage

yield = actual yield/theoretical yield x 100

yield could be in moles {note: when working backwards, divide 100 by

the theoretical mass, not the theoretical mass by 100)


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