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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 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 chemistryWhich atom has more valence electrons: chlorine (Cl) or magnesium (Mg)?
2General chemistryA sample contains 2.2 mol and has stated molar mass 97 g/mol. Find its mass. Round to 3 decimal places if needed. Answer in g.
g
3Chemical reactionsIn a sealed container, 9.3 g of A and 18 g of B react until B is used up. 4.7 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: __ CH₄ + __ O₂ → __ CO₂ + __ H₂O. What is the coefficient of CH₄?
5Acids, bases & pHSolution X has pH 13 and solution Y has pH 6. Which is more basic?
6Acids, bases & pHA solution at 25 °C has a pH of 9.5. Is it acidic, neutral or basic?
7Analytical chemistryA supplied valid-range calibration is S = 2c + 0.2. The signal is 3.3. Find c in the calibration's arbitrary concentration units. Round to 3 decimal places if needed.
8Analytical chemistryA 83 mL aliquot at 2 mol/L is diluted to 332 mL total without reaction or loss. Find the final concentration. Round to 3 decimal places if needed. Answer in mol/L.
mol/L
9Physical chemistryFor one reaction as written, a bond model requires 322 kJ/mol to break bonds and releases 1139 kJ/mol on forming bonds. Estimate ΔH. Round to 3 decimal places if needed. Answer in kJ/mol.
kJ/mol
10Physical chemistryA reactant concentration decreases from 0.93 to 0.86 mol/L in 12 s. Find its positive average disappearance rate. Round to 3 decimal places if needed. Answer in mol/(L·s).
mol/(L·s)
11Organic chemistryA hydrocarbon molecule contains 4 carbon atoms. In a complete-combustion model, all its carbon forms CO₂. How many moles of CO₂ come from 8 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 303 repeat units, each contributing 62 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 122 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
14BiochemistryAn unbranched chain has 6 amino-acid residues. How many peptide links connect adjacent residues?

From Grade 10

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

15General chemistry (Grade 10)An isotope has atomic number 8 and mass number 18. How many neutrons does it have?
16General chemistry (Grade 10)A nucleus has 17 protons and 20 neutrons. What is its mass number?