Chemical Formulae
About this topic
This topic equips you with the skill to deduce and write chemical formulae for compounds, a fundamental requirement of the ECZ syllabus. You will learn to assign valencies to elements and radicals, and use either the valency method or charge balance method to construct correct formulae for binary and ternary compounds. Being able to write accurate formulae is non-negotiable for success in chemistry—it is needed for writing equations, performing mole calculations, and describing chemical processes. CBC activities focus on applying these rules to Zambian-relevant compounds. Strong performance in this area directly improves your scores in exam sections involving chemical reactions and quantitative chemistry.
What you'll practise (7 questions)
- Tetraborate is a polyatomic radical and the formula for sodium tetraborate is Na₂B₄O₇. What is the total number of atoms in the formula of aluminium tetraborate? A) 12 B) 13 C) 25 D) 35
- The phosphate of praseodymium has the chemical formula Pr₃(PO₄)₄. The formula of its oxide is...
- Deduce the chemical formula of strontium chloride if 264g of strontium reacted with 213g of chlorine.
- The formula for sodium tetraborate is given as Na₂B₄O₇. What is the formula for aluminium tetraborate?
- What is the chemical formula for water?
- What is the chemical formula for carbon dioxide?
- What is the chemical formula for sodium chloride?
Answer each question above to see the correct answer and a full explanation.