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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 5 of 5

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

1General chemistryA model sample has mass 33 g and stated molar mass 55 g/mol. Find its amount. Round to 3 decimal places if needed. Answer in mol.
mol
2General chemistryWhich atom has more valence electrons: rubidium (Rb) or beryllium (Be)?
3Chemical reactionsIn a sealed container, 24.3 g of A and 4.7 g of B react until B is used up. 12.2 g of A is left over, and the only product is C. What mass of C forms?
g
4Chemical reactionsBalance this equation using the smallest whole-number coefficients: __ H₂ + __ O₂ → __ H₂O. What is the coefficient of H₂O?
5Acids, bases & pHSolution X has pH 11 and solution Y has pH 8. Which is more basic?
6Acids, bases & pHA solution at 25 °C has a pH of 3.5. Is it acidic, neutral or basic?
7Inorganic chemistryHow many chloride ions balance one Fe³⁺ ion?
8Inorganic chemistryAn ion changes from +3 to +2. It is what?
9Analytical chemistryA 62 mL aliquot at 0.2 mol/L is diluted to 682 mL total without reaction or loss. Find the final concentration. Round to 3 decimal places if needed. Answer in mol/L.
mol/L
10Analytical chemistryA 246 g sample is 51% desired substance by mass. Find the desired substance mass. Round to 3 decimal places if needed. Answer in g.
g
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 chemistryUsing the dilute school model, find pH when [H₃O⁺] = 10⁻³ mol/L.
13Organic chemistryAn acyclic saturated hydrocarbon has 7 carbon atoms. How many hydrogen atoms does its molecular formula contain? Round to 3 decimal places if needed.
14Organic chemistryWhat is the name of the straight-chain alkane with three carbons?

From Grade 8

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

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