Question paper
WA2 Practice Paper
40 marks · 55 min · 5 pages
10 multiple-choice questions and structured questions with answer lines. Chapters 3–4 (chemical bonding and structure; chemical calculations).
Term 2G2 / G3
Sec 3 Combined Science (Chemistry) WA2 practice paper
WA2 is usually the Term 2 assessment. In the common scheme it covers the conceptual heart of the Sec 3 chemistry half: ionic and covalent bonding, structures and properties, elements and compounds, and the mole calculations of the Combined syllabus.
- Total marks
- 40
- Time
- 55 min
- Covers
- Chapters 3–4 (chemical bonding and structure; chemical calculations)
- Format
- 10 MCQ + 5 structured
The paper and mark scheme
Set out like a school paper, with a separate mark scheme for checking.
Mark scheme
PROWA2 Practice Paper — mark scheme
Answers · Marking points · 3 pages
Model answers with a mark for each creditworthy point — for marking at home or in class.
What’s tested
Commonly Chapters 3–4 (chemical bonding and structure; chemical calculations). Some schools stop before titration calculations, so check your school’s outline.
How to use this paper
- 1Print the paper, or open the PDF and write on paper.
- 2Set a timer for 55 min and work without notes.
- 3Mark your answers with the mark scheme, one point at a time.
- 4Redo every question you lost marks on, then revise that topic.
Preview
The first questions of Section A, as they appear on the paper.
Section A: Multiple choice[10 marks]
Answer all questions. For each question, write the letter (A, B, C or D) of the correct answer.
- 1( )
Magnesium chloride, MgCl₂, forms when magnesium atoms
- Atransfer two electrons, one to each of two chlorine atoms
- Bshare electrons with chlorine atoms
- Ctransfer one electron to one chlorine atom
- Dgain electrons from chlorine atoms
- 2( )
The formula of aluminium oxide, built from Al³⁺ and O²⁻ ions, is
- AAlO
- BAl₃O₂
- CAlO₂
- DAl₂O₃
- 3( )
Which property is typical of an ionic compound such as potassium chloride?
- Ait conducts electricity when solid
- Bit melts at a low temperature
- Cit conducts electricity when molten
- Dit evaporates easily
- 4( )
A molecule of methane, CH₄, is held together by
- Aionic bonds only
- Bmetallic bonding
- Chydrogen bonds
- Dfour covalent bonds
Revision checklist
- Draw dot-and-cross diagrams for NaCl, MgCl₂, H₂, O₂, H₂O, CH₄ and CO₂ from memory.
- Deduce formulae from ion charges and link each structure to two properties, including electrical conductivity.
- Describe metals and alloys through their lattice, and why alloys are harder.
- Convert mass ↔ moles ↔ gas volume (24 dm³ at r.t.p.) ↔ concentration fluently.
- Write balanced equations with state symbols and pick out the ionic equation.
- Mark your Chapter 3–4 topical questions strictly, then attempt this paper against the clock.
Exam tips
- Show the formula (n = m ÷ Mr, n = V ÷ 24) before substituting — method marks survive arithmetic slips.
- Convert cm³ to dm³ by dividing by 1000 before dividing into moles.
- For bonding questions, name the electron transfer or sharing and the electrostatic attraction.
- In “explain property” questions, link the structure to the property explicitly.
Questions about the WA2
What is tested in Sec 3 Combined Science (Chemistry) WA2?
Typically Chapter 3 (ionic and covalent bonding with dot-and-cross diagrams, properties of structures, metals and alloys) and Chapter 4 (formulae, equations, moles, reacting masses, gas volumes and concentrations). Confirm with your school’s assessment outline.
Do I need to memorise the molar gas volume?
Yes: in the Combined Science data treatment one mole of any gas occupies 24 dm³ at room temperature and pressure.
Is this paper based on a real school paper?
No. QuizQuip papers are original material written against the syllabus. QuizQuip is not affiliated with MOE or SEAB.