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Grade 9 · Chemistry

Grade 9 Chemistry diagnostic

16 questions on general chemistry, chemical reactions, acids, bases & ph, inorganic chemistry, analytical chemistry, physical chemistry and organic chemistry, plus 2 from Grade 8. Answer what you can, then check your answers to see which topics are secure and what to practise next.

16 questions7 topicsAbout 20 minutesSet 4 of 5

Skip a question if you do not know the answer. It is better than guessing, because it shows what to practise.

1General chemistryWhich atom has the larger atomic radius: potassium (K) or cesium (Cs)?
2General chemistryWhich is the correct formula for the ionic compound formed from lithium (Li) and sulfur (S)?
3Chemical reactionsBalance this equation using the smallest whole-number coefficients: __ C₄H₁₀ + __ O₂ → __ CO₂ + __ H₂O. What is the coefficient of CO₂?
4Chemical reactionsIn a sealed container, 9.4 g of A and 5.9 g of B react until B is used up. 0.9 g of A is left over, and the only product is C. What mass of C forms?
g
5Acids, bases & pHSolution X has pH 8 and solution Y has pH 6. Which is more acidic?
6Acids, bases & pHSolution X has pH 4 and solution Y has pH 3. Which is more acidic?
7Inorganic chemistryRemoving the first electron from a neutral gas-phase atom measures what?
8Inorganic chemistryWhich neutral formula matches Al³⁺ and O²⁻?
9Analytical chemistryFind concentration for 0.15 mol in 0.50 L of solution.
mol/L
10Analytical chemistryA model solution contains 2.4 mol in a final volume of 1.48 L. Find its molar concentration. Round to 3 decimal places if needed. Answer in mol/L.
mol/L
11Physical chemistryTwo stated reaction steps have ΔH values −40 and +15 kJ/mol and sum exactly to a target reaction. What is the target ΔH?
kJ/mol
12Physical chemistryIn an explicitly first-order rate law r = k[A], doubling [A] while k stays fixed multiplies r by what factor?
13Organic chemistryAn acyclic saturated hydrocarbon has 11 carbon atoms. How many hydrogen atoms does its molecular formula contain? Round to 3 decimal places if needed.
14Organic chemistryA stated repeat unit has two carbon atoms. How many carbons are in 30 such repeat units, ignoring end groups?

From Grade 8

These questions check skills from the grade below, so gaps can be spotted early.

15General chemistry (Grade 8)Which description fits a compound?
16General chemistry (Grade 8)A stated mixture has 12 g of one component and 8 g of another. What is its total mass?
g