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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 2 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, 47 mol A and 54 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 chemistryWhich atom has the larger atomic radius: lithium (Li) or cesium (Cs)?
3Chemical reactionsBalance this equation using the smallest whole-number coefficients: __ Fe₂O₃ + __ CO → __ Fe + __ CO₂. What is the coefficient of Fe₂O₃?
4Chemical reactionsIn a sealed container, 4.3 g of A and 16.4 g of B react until B is used up. 0.9 g of A is left over, and the only product is C. What mass of C forms?
g
5Acids, bases & pHSolution X has pH 9 and solution Y has pH 6. Which is more acidic?
6Acids, bases & pHSolution X has pH 9 and solution Y has pH 2. Which is more acidic?
7Analytical chemistryAn aqueous solution has concentration 0.3 mol/L. A model aliquot has volume 33 mL. Find the solute amount. Round to 3 decimal places if needed. Answer in mol.
mol
8Analytical chemistryA 86 mL aliquot at 1.3 mol/L is diluted to 258 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 A ⇌ B, use Kc = [B]/[A]. Equilibrium concentrations are [A] = 2.2 and [B] = 3.1 mol/L. Find Kc. Round to 3 decimal places if needed.
10Physical chemistryAn ideal gas has initial pressure 180 kPa and volume 5.2 L. At fixed amount and temperature its volume becomes 7.9 L. Find the new pressure. Round to 3 decimal places if needed. Answer in kPa.
kPa
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 5 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 399 repeat units, each contributing 56 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 25 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
14BiochemistryWhat often faces the aqueous environment in a phospholipid bilayer?

From Grade 10

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

15General chemistry (Grade 10)In 2H₂ + O₂ → 2H₂O, how many hydrogen atoms are represented on the product side?
16General chemistry (Grade 10)An isotope has atomic number 8 and mass number 18. How many neutrons does it have?