F4 CHEM OPENER TERM 3 2026 MS
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Word Editable SampleFORM 4 TERM 3 OPENER EXAM 2026
233
CHEMISTRY
MARKING SCHEME
1.
(a) 1 mk
• The mole is the amount of a substance that contains the same number of particles (atoms, molecules or ions) as there are atoms in 12 g of carbon-12 (i.e. Avogadro's number, 6.02 × 10²³ particles). (B1)
(b) 2 mks
• Moles = mass ÷ molar mass = 11.5 ÷ 23.0 (M1)
• Moles = 0.5 mol (A1)
Q1 total = 3 marks
2.
(a) 2 mks
• (B1 for Mg²⁺ shown with no electrons in the outer shell; B1 for both Cl⁻ ions each shown with 8 electrons in the outer shell, one pair transferred from Mg)
(b) 1 mk
• High melting/boiling point; OR conducts electricity when molten or in aqueous solution (but not when solid). (B1 for any one correct property)
This document is professionally prepared and verified for Form 4 (Secondary (8-4-4)) • Term 3.
- Competency-driven teacher inquiry models
- Guiding questions for active learner engagement
- Real-life problem-solving applications
- Formative & summative assessment indicators
- Performance levels (Exceeding, Meeting, Approaching)
- Practical assessment task breakdowns