Form Four Chemistry regional mock papers
The Morogoro 2026 paper is free to try here
Regional mock examinations are set close to the national exam and give a realistic test of the full syllabus. Use this paper under timed conditions, then check your work with the marking scheme.
Morogoro Region Form Four Chemistry Mock 2026 (032/1)
Time: 3 hours · Section A: 16 marks · Section B: 54 marks · Section C: 30 marks
Instructions from the paper:
• This paper consists of three sections A, B and C with a total of eleven (11) questions.
• Answer all questions from Sections A and B and two (2) questions from Section C.
• Section A carries 16 marks, Section B 54 marks and Section C 30 marks.
How to use this page: choose an option for each multiple-choice question and click “Check Answer”. A correct answer plays a short sound and shows an explanation; a wrong answer shows the right option and why. For the matching item and written questions, answer on paper first, then click “View Answer”.
SECTION A (16 marks): Question 1 — Multiple Choice (10 marks)
(i) What should be done when concentrated sulphuric acid is spilled on the skin?
(ii) Which is not an appropriate fire extinguisher for a fire involving organic materials such as timber, paper and firewood?
(iii) Two solutions mixed at 20 °C; the temperature fell to 18 °C. What type of reaction does this indicate?
(iv) An electric current is passed through concentrated sodium chloride with graphite electrodes. What is formed at the anode?
(v) The type of chemical reaction in which two aqueous solutions form one solid (insoluble) compound is called:
(vi) An organic compound has empirical formula CH and relative molecular mass 28. Its molecular formula is:
(vii) Scientists analysing the chemical composition and transformation of substances for a new vaccine are working in which branch of chemistry?
(viii) Zinc reacts with hydrochloric acid to produce hydrogen. In this reaction zinc:
(ix) In the reaction Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + 2KNO3(aq), how is the solid product separated?
(x) Where would you place an element with atomic number 18 in the modern periodic table?
SECTION A continued: Question 2 — Matching Item (6 marks)
Match the descriptions in List A with the corresponding scientific procedures in List B. (6 marks)
| # | List A | Your answer |
|---|---|---|
| i | A statement of how the results relate to the hypothesis | |
| ii | A series of investigations | |
| iii | A statement that identifies an event, fact or situation | |
| iv | A tentative explanation | |
| v | A step in which the research explains the results | |
| vi | Understanding and explaining the analysed data |
List B
- A. Conclusion
- B. Data analysis
- C. Data collection
- D. Hypothesis
- E. Observations
- F. Problem identification
- G. Experimentation
Correct matches (1 mark each): i-A, ii-G, iii-F, iv-D, v-B, vi-B
- i. Conclusion
- ii. Experimentation
- iii. Problem identification
- iv. Hypothesis
- v. Data analysis
- vi. Data analysis
SECTION B (54 marks): Questions 3–8
3. (a) Explain three environmental effects of using charcoal as a source of fuel.
(b) Explain three factors to consider when choosing a good fuel.
(c) Kerosene has a heat value of 43 400 kJ/kg. What volume of kerosene is required to raise the temperature of 20 L of water from 24 °C to 100 °C? (c = 4.18 kJ kg⁻¹ K⁻¹; density of water = 1000 kg m⁻³; density of kerosene = 810 kg m⁻³)
Suggested answer and marking guide
(a) Deforestation (trees cut for wood); release of CO₂ contributing to greenhouse effect; smoke, CO and particulates causing air pollution and health problems (3 marks).
(b) High heat value; availability and cost; environmental and safety considerations (little smoke, safe storage) (3 marks).
(c) Mass of water = 20 kg; ΔT = 76 °C; Q = 20 × 4.18 × 76 = 6353.6 kJ. Mass of kerosene = 6353.6 / 43400 ≈ 0.1464 kg. Volume = 0.1464 / 810 ≈ 1.81 × 10⁻⁴ m³ ≈ 0.181 L = 181 cm³ (6–7 marks).
4. (a) Name two conditions associated with equilibrium reactions.
(b) For 2SO₂(g) + O₂(g) ⇌ 2SO₃(g) ΔH = −84.9 kJ/mol:
(i) Why does increased pressure give a higher yield of SO₃?
(ii) How would you adjust temperature to maximise the product? Give reasons.
(iii) Name the catalyst used.
(iv) Why is it unfavourable to work with very high pressure and very low temperature?
Suggested answer and marking guide
(a) Temperature and pressure (concentration also) (2 marks).
(b)
- (i) Forward reaction has fewer gas moles (3 → 2); high pressure shifts equilibrium to the right (2 marks).
- (ii) Lower the temperature (exothermic forward reaction) but not so low that the rate becomes impractical (2 marks).
- (iii) Vanadium(V) oxide, V₂O₅ (1 mark).
- (iv) Very high pressure is expensive; very low temperature makes the reaction too slow for industrial production (2 marks).
5. Laboratory preparation of hydrogen using zinc and hydrochloric acid.
(i) State the equation for the reaction.
(ii) Why is dilute HCl preferred to concentrated acid?
(iii) How do you test for H₂ after collection?
(iv) Why is H₂ collected over water?
(v) Why are zinc granules preferred to pure finely divided zinc?
Suggested answer and marking guide
- (i) Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g) (2 marks)
- (ii) Dilute acid gives a controllable rate; concentrated acid reacts too vigorously and is more hazardous (2 marks)
- (iii) Lighted splint; burns with a “pop” sound (2 marks)
- (iv) Hydrogen is only slightly soluble in water (1 mark)
- (v) Granules give a manageable surface area and rate; pure fine zinc may react too rapidly (1 mark)
6. Green solid N + dilute HNO₃ → blue solution X + gas R (turns lime water milky). Heating hydrated X → black solid S + brown fumes Y + gas Z (relights glowing splint).
(i) Identify solid X, gas Y and gas Z.
(ii) Equation for N + dilute HNO₃.
(iii) Equation for formation of solid S.
Suggested answer and marking guide
- (i) X = copper(II) nitrate, Cu(NO₃)₂; Y = nitrogen dioxide, NO₂; Z = oxygen, O₂ (3 marks)
- (ii) CuCO₃(s) + 2HNO₃(aq) → Cu(NO₃)₂(aq) + CO₂(g) + H₂O(l) (2 marks)
- (iii) 2Cu(NO₃)₂(s) → 2CuO(s) + 4NO₂(g) + O₂(g); S = CuO (2 marks)
7. (a) Name the separation process for each of the following:
(i) Solid iodine and sand
(ii) Kerosene and water
(iii) Petrol from crude oil
(iv) Tea from tea leaves
(v) Pure water from tea
(b) State four necessary conditions for a solvent used in solvent extraction.
Suggested answer and marking guide
(a) (i) Sublimation (ii) Separating funnel (iii) Fractional distillation (iv) Filtration (v) Simple distillation (5 marks).
(b) Dissolves the required solute readily; immiscible (or sufficiently so) with the original solvent; does not react with solute or other solvent; allows preferential extraction and is easy to remove afterwards (any four, 4 marks).
8. Electrolysis of CuSO₄ using copper electrodes.
(i) Factors that govern discharge of ions at an electrode.
(ii) Electrode reactions at cathode and anode.
(iii) Why does the solution remain blue?
(iv) Three applications of electrolysis in daily life.
Suggested answer and marking guide
- (i) Position in electrochemical series; concentration of ions; nature of electrode; applied potential/overvoltage (any three–four, 3–4 marks)
- (ii) Cathode: Cu²⁺ + 2e⁻ → Cu; Anode: Cu → Cu²⁺ + 2e⁻ (2 marks)
- (iii) Cu²⁺ removed at cathode are replaced by Cu²⁺ from dissolving anode, so concentration stays roughly constant (2 marks)
- (iv) Electroplating; electrorefining of metals (e.g. copper); extraction of metals / manufacture of chemicals (Cl₂, NaOH, Al, H₂) (3 marks)
SECTION C (30 marks): Answer any two questions
9. Explain six methods of applying fertilisers so that a farmer can obtain high yields.
Suggested answer and marking guide (≈15 marks)
Any six (≈2 marks each): broadcasting; band placement; spot placement; side dressing; foliar application; ring placement. Brief explanation of each method.
10. Use the organic scheme (butanol reactions) to answer:
(a) Structure of compound A
(b) Class of A
(c) Name and structure of D
(d) Class of D
(e) Equation for step 4
(f) Reagent for step 2
(g) Reagents/conditions for steps 3 and 6
(h)–(j) Types of reaction in steps 3, 6 and 7
Suggested answer and marking guide
- (a) A = butyl ethanoate, CH₃COOCH₂CH₂CH₂CH₃
- (b) Ester
- (c) D = butane, CH₃CH₂CH₂CH₃
- (d) Alkane
- (e) C₄H₉OH + 6O₂ → 4CO₂ + 5H₂O (complete combustion)
- (f) Sodium (or other active metal): 2C₄H₉OH + 2Na → 2C₄H₉ONa + H₂
- (g) Step 3: conc. H₂SO₄, heat (dehydration). Step 6: steam/H₃PO₄, elevated T and P (hydration)
- (h) Dehydration / elimination
- (i) Addition (hydration)
- (j) Oxidation
11. Mixing an acid and a base has significant applications in real life. Substantiate with six real examples.
Suggested answer and marking guide (≈15 marks)
Any six applications (≈2 marks each): antacids (neutralise excess stomach acid); liming acidic soils; wastewater pH adjustment; treatment of bee/wasp stings; toothpaste (mild base neutralises mouth acids); industrial manufacture of salts and pH control.
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Which Form Four Chemistry regional exams are available?
The Morogoro Region 2026 mock paper is free on this page with interactive answers. Mock papers from other regions are available on the Click Online Academy app.
How do I use the interactive paper?
Choose an option for each multiple-choice question and click Check Answer to see whether you are right and why. For the matching item and written questions, answer on paper first, then click View Answer to see the suggested answer and marking guide.
How many questions must I answer?
Answer all questions in Sections A and B, and any two of the three questions in Section C.