WASSCE Chemistry · Paper 1 style

Chemistry and industry

One sample question with the full working. 3 more in the app, with instant feedback and repair sessions for the traps below.

The raw materials for the manufacture of cement are

Abauxite and cryolite
Biron ore and coke
Csand and soda ash
Dlimestone and clay

Show the answer and working

Answer: D

Heated in a kiln to form clinker, ground with gypsum.

Trap A Picks a related substance or process with a different role: Learn reagents and processes as one-line 'name → job' cards and contrast neighbours in a table (process | product | catalyst | conditions). Match the job in the stem, not just the topic.

Trap B Confuses metal extraction methods: Very reactive metals (K, Na, Ca, Mg, Al) are extracted by electrolysis; moderately reactive (Zn, Fe, Pb) by carbon reduction; unreactive (Au) occur native.

Trap C Mixes up a pair of similar chemical terms: Keep a list of confusable pairs with one defining feature each and a hook. Underline the key word in the stem and check it against the definition, not the sound of the name.

Traps in Chemistry and industry

Picks a related substance or process with a different role
Learn reagents and processes as one-line 'name → job' cards and contrast neighbours in a table (process | product | catalyst | conditions). Match the job in the stem, not just the topic.
Confuses metal extraction methods
Very reactive metals (K, Na, Ca, Mg, Al) are extracted by electrolysis; moderately reactive (Zn, Fe, Pb) by carbon reduction; unreactive (Au) occur native.
Mixes up a pair of similar chemical terms
Keep a list of confusable pairs with one defining feature each and a hook. Underline the key word in the stem and check it against the definition, not the sound of the name.
Uses everyday or macroscopic thinking instead of particles
Ask what the particles, ions or electrons are doing. Properties of a substance come from its particles and bonds, not from how it looks or feels.
Takes one factor as the whole answer
Ask whether the option is necessary or sufficient. If the stem involves two changes or two conditions, both must appear in the answer.
Confuses addition and substitution reactions
Saturated alkanes undergo SUBSTITUTION (e.g. with Cl₂ in UV light). Unsaturated alkenes/alkynes undergo ADDITION across the multiple bond (decolourise bromine water).
Oxidation/reduction definition errors
OIL RIG: Oxidation Is Loss of electrons, Reduction Is Gain. The oxidising agent is itself reduced. Oxidation number increases on oxidation.

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