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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 3 of 5

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

1General chemistryFor the abstract reaction A + 2B → C, 58 mol A and 38 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
2General chemistryA model sample has mass 211 g and stated molar mass 88 g/mol. Find its amount. Round to 3 decimal places if needed. Answer in mol.
mol
3Chemical reactionsClassify this reaction: 2 Na + Cl₂ → 2 NaCl
4Chemical reactionsBalance this equation using the smallest whole-number coefficients: __ BaCl₂ + __ Na₂SO₄ → __ BaSO₄ + __ NaCl. What is the coefficient of Na₂SO₄?
5Acids, bases & pHSolution X has pH 12 and solution Y has pH 10. Which is more acidic?
6Acids, bases & pHHow many times greater is the hydrogen-ion concentration in a solution of pH 10 than in a solution of pH 12?
7Analytical chemistryThe theoretical dry pure product mass is 125 g; the actual dry pure product mass is 19 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.
%
8Analytical chemistryA 218 g sample is 66% desired substance by mass. Find the desired substance mass. Round to 3 decimal places if needed. Answer in g.
g
9Physical chemistryAn ideal gas has initial pressure 60 kPa and volume 2.3 L. At fixed amount and temperature its volume becomes 1.7 L. Find the new pressure. Round to 3 decimal places if needed. Answer in kPa.
kPa
10Physical chemistryFor A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 2.8 and [B] = 3 mol/L. Find Kc. Round to 3 decimal places if needed.
11Organic chemistryIgnoring end groups in a supplied model, a polymer chain has 336 repeat units, each contributing 54 g/mol to the chain molar mass. Estimate that mass. Round to 3 decimal places if needed. Answer in g/mol.
g/mol
12Organic chemistryA hydrocarbon molecule contains 8 carbon atoms. In a complete-combustion model, all its carbon forms CO₂. How many moles of CO₂ come from 1.1 mol hydrocarbon? Round to 3 decimal places if needed. Answer in mol.
mol
13BiochemistryA simple unbranched, noncyclic peptide contains 119 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
14BiochemistryWhy do many ions need membrane transport proteins?