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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 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 chemistryWhich atom has the larger atomic radius: sodium (Na) or chlorine (Cl)?
2General chemistryA sample contains 1.9 mol and has stated molar mass 115 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.
g
3Chemical reactionsBalance this equation using the smallest whole-number coefficients: __ H₂SO₄ + __ NaOH → __ Na₂SO₄ + __ H₂O. What is the coefficient of H₂O?
4Chemical reactionsIn a sealed container, 18.4 g of substance A reacts completely with 16.4 g of substance B. The only product is substance C. What mass of C forms?
g
5Acids, bases & pHSolution X has pH 12 and solution Y has pH 10. Which is more acidic?
6Acids, bases & pHSolution X has pH 3 and solution Y has pH 2. Which is more acidic?
7Analytical chemistryA 114 g sample is 70% desired substance by mass. Find the desired substance mass. Round to 3 decimal places if needed. Answer in g.
g
8Analytical chemistryA model solution contains 22 g solute and 481 g solvent. Find the solute mass percentage. Round to 3 decimal places if needed. Answer in %.
%
9Physical chemistryFor A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 1.4 and [B] = 1.2 mol/L. Find Kc. Round to 3 decimal places if needed.
10Physical chemistryThe given standard reduction potentials are 0.43 V for the cathode and -0.19 V for the anode. Find E°cell. Round to 3 decimal places if needed. Answer in V.
V
11Organic chemistryIgnoring end groups in a supplied model, a polymer chain has 296 repeat units, each contributing 28 g/mol to the chain molar mass. Estimate that mass. Round to 3 decimal places if needed. Answer in g/mol.
g/mol
12Organic chemistryHow many carbon atoms are in CH₃COCH₂CH₃?
13BiochemistryA simple unbranched, noncyclic peptide contains 35 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
14BiochemistryA model has two leaflets containing 40 phospholipids each. How many phospholipids are represented?

From Grade 10

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

15General chemistry (Grade 10)A neutral atom has 11 protons. How many electrons does it have?
16General chemistry (Grade 10)An ion has 12 protons and 10 electrons. What is its signed charge number?