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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 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 chemistryA model sample has mass 19 g and stated molar mass 11 g/mol. Find its amount. Round to 3 decimal places if needed. Answer in mol.
mol
2General chemistryWhat mass is 0.25 mol of a substance with stated molar mass 80 g/mol?
g
3Chemical reactionsIn a sealed container, 15.7 g of A and 12.9 g of B react until B is used up. 1.6 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: __ Al + __ O₂ → __ Al₂O₃. What is the sum of all the coefficients?
5Acids, bases & pHSolution X has pH 6 and solution Y has pH 8. Which is more acidic?
6Acids, bases & pHSolution X has pH 2 and solution Y has pH 11. Which is more acidic?
7Analytical chemistryA model solution contains 0.5 mol in a final volume of 0.44 L. Find its molar concentration. Round to 3 decimal places if needed. Answer in mol/L.
mol/L
8Analytical chemistryFive repeated measurements of the mass of the same sample (g) are: Trial 1 = 20.76; Trial 2 = 20.78; Trial 3 = 22.06; Trial 4 = 20.76; Trial 5 = 20.74. Leave out the outlier (trial 3) and find the mean of the other four. Round to 2 decimal places.
g
9Physical chemistryA reactant concentration decreases from 1.36 to 1.23 mol/L in 47 s. Find its positive average disappearance rate. Round to 3 decimal places if needed. Answer in mol/(L·s).
mol/(L·s)
10Physical chemistryUse PV = nRT and R = 8.314 kPa·L/(mol·K). Find the ideal-gas volume for 1.1 mol at 282 K and 81 kPa. Round to 3 decimal places if needed. Answer in L.
L
11Organic chemistryIgnoring end groups in a supplied model, a polymer chain has 256 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 chemistryName the straight-chain alkane CH₃CH₂CH₂CH₃.
13BiochemistryA simple unbranched, noncyclic peptide contains 52 amino-acid residues. How many peptide links connect adjacent residues? Round to 3 decimal places if needed.
14BiochemistryWhich feature is part of a nucleotide?