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Grade 10 · Chemistry

Grade 10 Chemistry diagnostic

14 questions on general chemistry, chemical reactions, acids, bases & ph, analytical chemistry, physical chemistry, organic chemistry and biochemistry. Answer what you can, then check your answers to see which topics are secure and what to practise next.

14 questions7 topicsAbout 15 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 230 g and stated molar mass 136 g/mol. Find its amount. Round to 3 decimal places if needed. Answer in mol.
mol
2General chemistryFor the abstract reaction A + 2B → C, 14 mol A and 7 mol B are available. Assume complete consumption of the limiting reactant. Find the maximum amount of C. Round to 3 decimal places if needed. Answer in mol.
mol
3Chemical reactionsBalance this equation using the smallest whole-number coefficients: __ N₂ + __ H₂ → __ NH₃. What is the coefficient of NH₃?
4Chemical reactionsIn a sealed container, 27.3 g of substance A reacts completely with 3.1 g of substance B. The only product is substance C. What mass of C forms?
g
5Acids, bases & pHSolution X has pH 4 and solution Y has pH 11. Which is more basic?
6Acids, bases & pHA solution at 25 °C has a pH of 1. Is it acidic, neutral or basic?
7Analytical chemistryThe theoretical dry pure product mass is 167 g; the actual dry pure product mass is 89 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.
%
8Analytical chemistryA model solution contains 2.9 mol in a final volume of 1.8 L. Find its molar concentration. Round to 3 decimal places if needed. Answer in mol/L.
mol/L
9Physical chemistryAt 25 °C, use the dilute model pH + pOH = 14. A solution has pH 3.2. Find pOH. Round to 3 decimal places if needed.
10Physical chemistryFor one reaction as written, a bond model requires 527 kJ/mol to break bonds and releases 1112 kJ/mol on forming bonds. Estimate ΔH. Round to 3 decimal places if needed. Answer in kJ/mol.
kJ/mol
11Organic chemistryA hydrocarbon molecule contains 12 carbon atoms. In a complete-combustion model, all its carbon forms CO₂. How many moles of CO₂ come from 0.1 mol hydrocarbon? Round to 3 decimal places if needed. Answer in mol.
mol
12Organic chemistryIgnoring end groups in a supplied model, a polymer chain has 431 repeat units, each contributing 100 g/mol to the chain molar mass. Estimate that mass. Round to 3 decimal places if needed. Answer in g/mol.
g/mol
13BiochemistryA simple unbranched, noncyclic peptide contains 100 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
14BiochemistryWhich bond class describes a peptide linkage?