Question 1
Covalent radius decreases across period 3 from sodium to chlorine. Which statement explains this trend?
The Section 1 multiple-choice questions
Section 1 is an objective test: 20 four-option multiple-choice questions from across the course, one mark each. Many need a short calculation or a careful reading of data.
| Questions | 20, four options each |
|---|---|
| Marks | 20, one a question |
| Content | All four areas |
| Our pace | About 30 minutes |
Working through a question
- Cover the options and answer the question yourself first, then find your answer among them.
- For a calculation, write the equation and the mole ratio before you reach for numbers; wrong options are often the result of one common slip.
- Rule out options you know are wrong, and check the unit each option is in: mol, mol l⁻¹, g or kJ mol⁻¹.
Practising Section 1
The practice here has original multiple-choice questions for every area, worked or timed, and two timed Section 1 practice papers of 20 questions in 30 minutes, marked by area with every answer explained.
Try 2 questions
Question 2
What is the mass of 0.150 mol of ammonium sulfate, (NH₄)₂SO₄? (Relative atomic masses: H 1.0, N 14.0, O 16.0, S 32.1)
Next step
Questions people ask
How many multiple-choice questions are in Higher Chemistry?
20 in Section 1, one mark each, 20 marks in all.
Are the Section 1 practice papers like Section 1?
They have its shape: 20 original four-option questions across the four areas. We time them at 30 minutes, our advice for Section 1 within the 2 hours 30 minutes.