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GCSE Chemistry — Diagnostic Test

Question 1 of 150s
Quantitative ChemistryDifficulty medium

What is the empirical formula of a compound that contains 40% calcium, 12% carbon, and 48% oxygen by mass?

Scoring

Count your correct answers and identify areas for revision:

ScoreGradeRecommendation
17-209Excellent — focus on exam technique and harder questions
14-167-8Strong — review missed topics
10-135-6Good foundation — systematic revision needed
6-93-4Gaps exist — work through each topic’s notes
0-51-2Significant revision needed — start with fundamentals

Next steps: For each incorrect answer, review the linked topic notes and work through the practice questions on that page.