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Grade 11 · Chemistry

Grade 11 Chemistry diagnostic

16 questions on general chemistry, chemical reactions, acids, bases & ph, analytical chemistry, physical chemistry, organic chemistry and biochemistry, plus 2 from Grade 10. 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 chemistryFor the abstract reaction A + 2B → C, 13 mol A and 46 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 sample contains 3.3 mol and has stated molar mass 123 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.
g
3Chemical reactionsClassify this reaction: CO₂ + H₂O → H₂CO₃
4Chemical reactionsBalance this equation using the smallest whole-number coefficients: __ Fe + __ O₂ → __ Fe₂O₃. What is the sum of all the coefficients?
5Acids, bases & pHSolution X has pH 9 and solution Y has pH 2. Which is more acidic?
6Acids, bases & pHA solution at 25 °C has a pH of 10.5. Is it acidic, neutral or basic?
7Analytical chemistryThe theoretical dry pure product mass is 179 g; the actual dry pure product mass is 46 g. Find percentage yield. Round to 3 decimal places if needed. Answer in %.
%
8Analytical chemistryA model solution contains 1.7 mol in a final volume of 0.11 L. Find its molar concentration. Round to 3 decimal places if needed. Answer in mol/L.
mol/L
9Physical chemistryAn ideal gas has initial pressure 128 kPa and volume 4 L. At fixed amount and temperature its volume becomes 1.6 L. Find the new pressure. Round to 3 decimal places if needed. Answer in kPa.
kPa
10Physical chemistryFor one reaction as written, a bond model requires 817 kJ/mol to break bonds and releases 937 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 6 carbon atoms. In a complete-combustion model, all its carbon forms CO₂. How many moles of CO₂ come from 0.9 mol hydrocarbon? Round to 3 decimal places if needed. Answer in mol.
mol
12Organic chemistryWhat is the simple systematic name of CH₃COCH₃?
13BiochemistryA simple unbranched, noncyclic peptide contains 162 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
14BiochemistryWhere are phospholipid tails mainly found in a bilayer?

From Grade 10

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

15General chemistry (Grade 10)In 3CO₂, how many oxygen atoms are represented?
16General chemistry (Grade 10)What must two isotopes of one element share?