2026 Form 4 Chemistry Mid Term 2 Exam with Marking Scheme

This paper  covers the following topics:

• Graham’s Law of diffusion — statement and calculation
• Endothermic and exothermic physical processes
• Atomic structure — protons, neutrons, dot-and-cross diagrams
• Preparation and collection of carbon (II) oxide
• Solubility curves — gases and salts
• Industrial chemistry flow charts
• Electrochemistry concepts
• Properties of elements — electrical conductivity, ductility, reactivity with water
• Isotopes and percentage abundance calculations (Potassium)
• Acid-base chemistry — Brønsted-Lowry theory (ammonia and water reaction)
• Reaction of gases with metals (magnesium and nitrogen)
• Organic chemistry — isomers and homologous series
• Allotropy — carbon allotropes (diamond and graphite)
• Testing for sulphate ions in water
• Separation techniques — sublimation
• Number of Questions: 27 questions (Questions 1–27)
• Structure: All questions compulsory, answered in the spaces provided