Concordant titres are within
Salam Academy Original Practice · Proposed mark scheme
Practise
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12 questions
A burette has an uncertainty of ±0.05 cm³ per reading. Calculate the % uncertainty in a titre of 25.00 cm³.
Salam Academy Original Practice · Proposed mark scheme
Before filling a burette, it should be rinsed with
Salam Academy Original Practice · Proposed mark scheme
Calculate q (J) when 50.0 g of solution warms by 6.5 °C (c = 4.18 J g⁻¹ K⁻¹).
Salam Academy Original Practice · Proposed mark scheme
A thermometer reads to ±0.5 °C. Calculate the % uncertainty in a temperature rise of 6.5 °C.
Salam Academy Original Practice · Proposed mark scheme
Plotting a cooling curve and extrapolating corrects for
Salam Academy Original Practice · Proposed mark scheme
To test for NH₄⁺ ions,
Salam Academy Original Practice · Proposed mark scheme
The burette reading should be taken
Salam Academy Original Practice · Proposed mark scheme
In a clock reaction, the initial rate is proportional to
Salam Academy Original Practice · Proposed mark scheme
Titres: 24.50, 24.55, 24.95 cm³ (rough titre excluded already). Calculate the mean of the concordant titres.
Salam Academy Original Practice · Proposed mark scheme
Using q = 1359 J for 0.0500 mol of water formed, calculate ΔH (kJ mol⁻¹).
Salam Academy Original Practice · Proposed mark scheme
To reduce the % uncertainty in a titre, you could
Salam Academy Original Practice · Proposed mark scheme