DP Chemistry Questionbank

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• 18M.1.sl.TZ2.29: How are the uncertainties of two quantities combined when the quantities are multiplied...
• 18M.3.sl.TZ1.2d.iii: Another student, working alone, always dropped the marble chips into the acid and then picked up...
• 18M.3.sl.TZ1.2d.ii: If doubling the concentration doubles the reaction rate, suggest the mean time you would expect...
• 18M.3.sl.TZ1.2d.i: Justify why it is inappropriate to record the uncertainty of the mean as ±0.01 s.
• 18M.1.sl.TZ1.28: Which value of q, in J, has the correct number of significant figures? q = mcΔT where m = 2.500...
• 18M.1.sl.TZ1.13: The enthalpy of combustion of ethanol is determined by heating a known mass of tap water in a...
• 17N.3.sl.TZ0.3c: Calculate the percentage of water by mass in the NaCl•2H2O crystals. Use the data from section 6...
• 17N.3.sl.TZ0.2c: Calculate the uncertainty in the change in pH.
• 17N.1.sl.TZ0.30: A student performs an acid-base titration using a pH meter, but forgets to calibrate it. Which...
• 17M.3.sl.TZ2.2b.ii: Suggest one improvement to the investigation.
• 17M.3.sl.TZ2.1c.iii: The change in APO O2/N2 ratio, per meg, is measured relative to an O2/N2...
• 17M.3.sl.TZ2.1b: O2 is consumed in producing CO2 for electricity generation. The graph shows the relationship...
• 17M.2.sl.TZ2.2b.i: Calculate the percentage uncertainty for the mass of K2Cr2O7(s) from the given data.
• 17M.2.sl.TZ2.1a.ii: Suggest why the final mass of solid obtained by heating 3.760 g of AgxOy may be greater than...
• 17M.3.sl.TZ1.5f: Outline why the thermochemical method would not be appropriate for 0.001...
• 17M.3.sl.TZ1.5b: Heat losses would make this method less accurate than the pH probe method. Outline why the...
• 17M.3.sl.TZ1.1b: Suggest how the precision of this measurement could be improved.
• 17M.1.hl.TZ1.38: The molar mass of a gas, determined experimentally, is 32 g mol−1. Its literature molar mass is...
• 17M.1.sl.TZ1.29: What is the density, in g\(\,\)cm−3, of a 34.79 g sample with a volume of 12.5 cm3? A.    ...
• 16N.2.sl.TZ0.3g: Suggest one reason why the values of rates of reactions obtained at higher temperatures may be...
• 16N.1.sl.TZ0.30: A student measured the change in mass on heating a sample of calcium carbonate, CaCO3(s). What is...
• 16M.3.sl.TZ0.2b: (i) State the colour change of the indicator that the student would see during his titration...
• 16M.3.sl.TZ0.2a: Outline, giving your reasons, how you would carefully prepare the 1.00dm3 aqueous solution from...
• 16M.1.hl.TZ0.38: ...
• 16M.1.sl.TZ0.28: What is the relationship between the two variables sketched on the...
• 16M.1.sl.TZ0.27: A measuring cylinder was used to obtain a known volume of a liquid. The volume...
• 15M.2.hl.TZ1.6f.iii: A student measures a voltage of 2.65 V in the voltaic cell formed between magnesium and copper...
• 15M.2.hl.TZ1.6f.iv: Outline how the student can reduce the random error in her results.
• 15M.2.hl.TZ1.5c: Students can also measure the enthalpy of combustion of ethanol in the laboratory using...
• 15M.1.sl.TZ1.15: The heat change in a neutralization reaction can be determined by mixing equal volumes of HCl(aq)...
• 15M.1.sl.TZ1.30: A student weighs a standard 70.00 g mass five times using the same balance. Each time she obtains...
• 15M.1.sl.TZ2.30: What is the best way to minimize the random uncertainty when titrating an acid of unknown...
• 15M.2.sl.TZ1.1a: State the uncertainty of the volume of NaOH added in \({\text{c}}{{\text{m}}^{\text{3}}}\).
• 15M.2.sl.TZ2.1b.iii: The accepted theoretical value from the literature of this enthalpy change is...
• 14M.2.hl.TZ2.1b: The concentration of ethanoic acid can be calculated as...
• 14M.2.hl.TZ2.1c.i: Calculate the absolute uncertainty of the titre for Titration 1...
• 14M.1.sl.TZ2.30: Which statement about errors is correct? A.     A random error is always expressed as a...
• 14M.1.sl.TZ1.30: A student carries out a titration three times and obtains the following volumes:...
• 14M.2.sl.TZ2.1c: Identify the liquid whose volume has the greatest percentage uncertainty.
• 14M.2.sl.TZ2.1d: (i)     Calculate the absolute uncertainty of the titre for Titration 1...
• 14N.2.hl.TZ0.1b: Calculate the percentage uncertainty in the measured pH of the rain water sample.
• 14N.1.sl.TZ0.30: In an experiment to determine a specific quantity, a student calculated that her experimental...
• 14N.2.sl.TZ0.1b: Calculate the percentage uncertainty in the measured pH of the rain water sample.
• 13N.2.hl.TZ0.1a: The concentration of iodide ions, \({{\text{I}}^ - }\), is assumed to be constant. Outline why...
• 13N.1.hl.TZ0.40: A student measured the mass and volume of a piece of silver and recorded the following...
• 13N.2.hl.TZ0.1b: For this mixture the concentration of hydrogen peroxide,...
• 13N.2.hl.TZ0.1d.i: Calculate the total uncertainty, in \({\text{c}}{{\text{m}}^{\text{3}}}\), of the volume of the...
• 13N.2.hl.TZ0.1d.ii: Calculate the percentage uncertainty of the concentration of potassium iodide solution added to...
• 13N.2.hl.TZ0.1d.iii: Determine the percentage uncertainty in the concentration of potassium iodide in the final...
• 13N.1.sl.TZ0.30: A student measured the mass and volume of a piece of silver and recorded the following...
• 13N.2.sl.TZ0.1d: For this mixture the concentration of hydrogen peroxide,...
• 13N.2.sl.TZ0.1c: The concentration of iodide ions, \({{\text{I}}^ - }\), is assumed to be constant. Outline why...
• 13N.2.sl.TZ0.1f: Apart from the precision uncertainties given, state one source of error that could affect this...
• 13M.1.sl.TZ1.30: Which would be the best method to decrease the random uncertainty of a measurement in an...
• 13M.2.sl.TZ1.1a: Calculate the mass of the acid and determine its absolute and percentage uncertainty.
• 13M.2.sl.TZ2.1a: When the \({\text{F}}{{\text{e}}^{2 + }}{\text{(aq)}}\) solution was made up in the...
• 13M.2.sl.TZ2.1b: State what is meant by the term precision.
• 13M.2.sl.TZ2.1c: When the students recorded the burette readings, following the titration with KMnO4 (aq),the top...
• 12N.1.sl.TZ0.30: \({\text{50 c}}{{\text{m}}^{\text{3}}}\) of copper(II) sulfate solution is measured into a...
• 12N.2.sl.TZ0.1a: (i)     State the number of significant figures for the masses of...
• 10N.1.sl.TZ0.30: Density can be calculated by dividing mass by volume. \(0.20 \pm 0.02{\text{ g}}\) of a metal has...
• 09N.1.sl.TZ0.30: Which are likely to be reduced when an experiment is repeated a number of times? A.     Random...
• 10M.1.sl.TZ2.30: How many significant figures are there in 0.00370? A.     2 B.     3 C.     5 D.     6
• 09M.1.sl.TZ1.30: A student recorded the volume of a gas as \({\text{0.01450 d}}{{\text{m}}^{\text{3}}}\). How many...
• 09M.1.sl.TZ2.30: Which would be the best method to decrease the random uncertainty of a measurement in an...
• 09M.2.sl.TZ2.1b.v: Another student repeated the experiment and obtained an experimental yield of 150%. The teacher...
• 09M.2.sl.TZ2.1b.iv: State the number of significant figures associated with the mass of pure aspirin obtained, and...
• 11M.1.sl.TZ1.30: A burette reading is recorded as \(27.70 \pm 0.05{\text{ c}}{{\text{m}}^{\text{3}}}\). Which of...
• 11M.2.sl.TZ1.4b: If the fuel blend was vaporized before combustion, predict whether the amount of energy released...
• 11M.1.sl.TZ2.30: A piece of metallic aluminium with a mass of 10.044 g was found to have a volume of...
• 11M.2.sl.TZ2.1c.i: Calculate the percentage error obtained in this experiment. (If you did not obtain an answer for...
• 11M.2.sl.TZ2.1c.ii: The student recorded in her qualitative data that the anhydrous copper(II) sulfate she used was...
• 11N.1.hl.TZ0.40: A student heated a solid in a crucible. The student measured the mass of the solid and crucible...
• 11N.2.sl.TZ0.1b.i: State the number of significant figures for the temperature, mass and pressure data. T: m: p:
• 11N.1.sl.TZ0.30: A student heated a solid in a crucible. The student measured the mass of the solid and crucible...