OCR A Level Chemistry A
OCR A Level Chemistry A Atoms, Compounds, Molecules and Equations Exam Questions
Free OCR A Level Chemistry A exam questions on Atoms, Compounds, Molecules and Equations, with mark schemes. Covers atomic structure, isotopes, relative masses, formulae and balanced equations.
Atoms, Compounds, Molecules and Equations exam questions
1 question pack of real past exam questions with its mark scheme. Answer every question without notes, then mark your answers line by line against the mark scheme.
StemUp mark scheme flashcards
OCR A Level Chemistry A H432 Flashcards (Anki & Quizlet)
Every answer is written in mark scheme wording, so you learn exactly what examiners give marks for. Use them on Anki or Quizlet, then test yourself with the questions on this page.
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About OCR A Level Chemistry A Atoms, Compounds, Molecules and Equations
This topic lays the foundations of chemistry.
What you need to know
- Atomic structure Protons, neutrons, electrons and isotopes.
- Relative masses Ar, Mr and relative isotopic mass.
- Formulae Ionic formulae and common ions.
- Equations Balancing full and ionic equations with state symbols.
Common mistakes in Atoms, Compounds, Molecules and Equations
- Missing state symbols.
- Wrong charges on polyatomic ions.
- Confusing relative isotopic mass and Ar.
Try three Atoms, Compounds, Molecules and Equations exam-style questions
1. Calculate Ar of chlorine with 75% ³⁵Cl and 25% ³⁷Cl. (1 mark)
Show the mark scheme answer
35.5.
2. Write the formula of aluminium sulfate. (1 mark)
Show the mark scheme answer
Al₂(SO₄)₃.
3. Define relative atomic mass. (2 marks)
Show the mark scheme answer
Weighted mean mass of an atom of an element (1) relative to 1/12 of the mass of carbon-12 (1).
Atoms, Compounds, Molecules and Equations FAQs
What does this topic cover?
Atomic structure, isotopes, formulae and equations.
Do I need to memorise ions?
Yes, common ions such as nitrate, sulfate and ammonium.
Which instrument finds isotopic abundance?
A mass spectrometer.
Revise this topic with flashcards: OCR A Level Chemistry A H432 Flashcards, with mark scheme answers for Anki and Quizlet.
