DP Chemistry Questionbank

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• 18M.3.sl.TZ2.16c: Explain why aspirin is not stored in a hot, humid location.
• 18M.2.sl.TZ2.2b.i: Sketch a curve on the graph to show the volume of gas produced over time if the same mass of...
• 18M.2.sl.TZ2.2a: Sketch a Maxwell–Boltzmann distribution curve for a chemical reaction showing the activation...
• 18M.1.sl.TZ2.17: Which factors can affect the rate of reaction?      I.     Particle size of solid reactant    ...
• 18M.1.sl.TZ2.16: The potential energy profile for the reversible reaction, X + Y ƒ\( \rightleftharpoons \) Z is...
• 18M.3.sl.TZ1.2c.ii: State a factor, that has a significant effect on reaction rate, which could vary between marble...
• 18M.3.sl.TZ1.2c.i: Deduce, giving a reason, which of the two methods would be least affected by the chips not having...
• 18M.3.sl.TZ1.2b: Neither method actually gives the initial rate. Outline a method that would allow the initial...
• 18M.3.sl.TZ1.1b.i: Suggest why there is a small increase in the surface pressure as the area is reduced to about 240...
• 18M.2.sl.TZ1.4b.ii: Suggest the relationship that points A, B and C show between the concentration of the acid and...
• 18M.2.sl.TZ1.4b.i: Suggest why point D is so far out of line assuming human error is not the cause.
• 18M.2.sl.TZ1.4a: Outline two ways in which the progress of the reaction can be monitored. No practical details are...
• 18M.1.sl.TZ1.17: Which statements are correct?      I.     The activation energy of a reaction is not affected by...
• 18M.1.sl.TZ1.16: Which change increases the rate of formation of hydrogen when zinc reacts with excess...
• 18M.2.hl.TZ1.4b.iii: Suggest the relationship that points A, B and C show between the concentration of the acid and...
• 18M.2.hl.TZ1.4b.i: Suggest why point D is so far out of line assuming human error is not the cause.
• 18M.2.hl.TZ1.4a: Outline two ways in which the progress of the reaction can be monitored. No practical details are...
• 17N.3.sl.TZ0.2b: Suggest two variables, besides the time of reaction, which the student should have controlled in...
• 17N.2.sl.TZ0.1e.ii: Suggest one possible reason for the differences between curves X and Y.
• 17N.2.sl.TZ0.1e.i: Explain the shape of curve X in terms of the collision theory.
• 17N.1.sl.TZ0.17: Excess magnesium powder was added to a beaker containing hydrochloric acid, HCl (aq). The mass...
• 17N.1.sl.TZ0.16: The diagram shows the energy profile for a catalysed and uncatalysed reaction.Which represents...
• 17M.2.sl.TZ1.1b: The student then carried out the experiment at other acid concentrations with all...
• 17M.2.sl.TZ1.1a.ii: A student produced these results with [H+] = 0.15 mol\(\,\)dm−3. Propanone and acid were in...
• 17M.2.sl.TZ1.1a.i: Suggest how the change of iodine concentration could be followed.
• 17M.1.sl.TZ1.17: 100 cm3 of 10% hydrogen peroxide solution decomposes at 298 K to form water and oxygen. H2O2(aq)...
• 17M.1.sl.TZ1.16: Copper catalyses the reaction between zinc and dilute sulfuric acid. Zn(s) + H2SO4(aq) →...
• 16N.2.sl.TZ0.3g: Suggest one reason why the values of rates of reactions obtained at higher temperatures may be...
• 16N.2.sl.TZ0.3f: An additional experiment was carried out at a higher temperature, T2. (i) On the same axes,...
• 16N.2.sl.TZ0.3e: A student decided to carry out another experiment using 0.075 mol dm-3 solution of sodium...
• 16N.2.sl.TZ0.3d: Draw the best fit line of \(\frac{1}{{\rm{t}}}\) against concentration of sodium thiosulfate on...
• 16N.1.sl.TZ0.17: Which experimental methods could be used to observe the progress of the following...
• 16N.1.sl.TZ0.16: For the reaction R → P, which letter represents the activation energy for the catalysed reverse...
• 16M.2.hl.TZ0.3b: The enthalpy change for the reaction between nitrogen monoxide and hydrogen is −664 kJ and its...
• 16M.2.hl.TZ0.3a: (i) State the equation for the overall reaction. (ii) Deduce the rate expression consistent with...
• 16M.2.sl.TZ0.3b: (i) Sketch the potential energy profile for the synthesis of phosgene, using the axes given,...
• 16M.1.sl.TZ0.17: Graph 1 shows a plot of volume of...
• 16M.1.sl.TZ0.16: Which conditions must be met for a reaction to take place? I.   Reactants collide with...
• 15M.2.hl.TZ1.3a: Define the term rate of reaction.
• 15M.2.hl.TZ1.3b: Describe the collision theory.
• 15M.2.hl.TZ2.2a: Define the term rate of reaction.
• 15M.2.hl.TZ2.2b: Explain why increasing the particle size of a solid reactant decreases the rate of reaction.
• 15M.2.hl.TZ2.7a.iii: Define the term activation energy, \({E_{\text{a}}}\).
• 15M.2.hl.TZ2.7b: Ammonia is manufactured by the Haber process in which iron is used as a catalyst. Explain the...
• 15M.1.sl.TZ1.18: Nitrogen gas reacts with hydrogen gas according to the following...
• 15M.1.sl.TZ1.17: Which variable is best to use when determining the rate of decomposition of hydrogen...
• 15M.1.sl.TZ2.17: Which is a correct unit for expressing the rate of a reaction? A.    ...
• 15M.1.sl.TZ2.18: \({\text{100 c}}{{\text{m}}^{\text{3}}}\) of a...
• 15M.2.sl.TZ1.3a: Define the term rate of reaction.
• 15M.2.sl.TZ1.3b: Describe the collision theory.
• 15M.2.sl.TZ2.5d.ii: Ammonia is manufactured by the Haber process in which iron is used as a catalyst. Explain the...
• 15M.2.sl.TZ2.5d.iii: Sketch the Maxwell–Boltzmann energy distribution curve for a reaction, labelling both axes and...
• 15M.2.sl.TZ1.7d.ii: Describe how a catalyst increases the rate of a reaction.
• 15M.2.sl.TZ2.5d.i: Define the term activation energy, \({E_{\text{a}}}\).
• 14M.1.hl.TZ2.22: Which pair of graphs shows a decomposition reaction of \(X\) that obeys first-order kinetics?
• 14M.1.hl.TZ2.8: Which statements explain why a catalyst is used in the Contact process (shown...
• 14M.2.hl.TZ1.2a: Deduce, with a reason, the order of reaction with respect to each reactant.
• 14M.2.hl.TZ2.1d: Outline how you could establish that the system had reached equilibrium at the end of one week.
• 14M.2.hl.TZ2.1e: Outline why changing the temperature has only a very small effect on the value of the equilibrium...
• 14M.2.hl.TZ2.6a: (i)     State the volumes of the liquids that should be mixed. (ii)     State why it is...
• 14M.2.hl.TZ2.6c: (i)     Sketch and label, indicating an approximate activation energy, the Maxwell–Boltzmann...
• 14M.1.sl.TZ1.17: Why does the rate of a reaction increase when the temperature is increased? I.     The...
• 14M.1.sl.TZ2.18: Which is not affected by an increase in temperature? A.     Rate of reaction B.     Collision...
• 14M.2.sl.TZ1.1a: (i)     The graph shows the volume of hydrogen produced against time under these experimental...
• 14M.1.sl.TZ1.18: The diagram represents the Maxwell‒Boltzmann energy distribution curve of the reactants for a...
• 14M.1.sl.TZ2.17: Which change increases the rate of a chemical reaction? A.     Increasing the size of solid...
• 14M.2.sl.TZ2.1b: The hydrochloric acid does not appear in the balanced equation for the reaction. State its function.
• 14M.2.sl.TZ2.1g: Outline how you could establish that the system had reached equilibrium at the end of one week.
• 14M.2.sl.TZ2.1h: Outline why changing the temperature has only a very small effect on the value of the equilibrium...
• 14M.2.sl.TZ2.5b: (i)     State the volumes of the liquids that should be mixed. (ii)     State why it is...
• 14M.2.sl.TZ2.5c: (i)     Sketch and label, indicating an approximate activation energy, the Maxwell–Boltzmann...
• 14M.2.sl.TZ2.5e: (i)     Calculate the volume of sulfur dioxide, in \({\text{c}}{{\text{m}}^{\text{3}}}\), that...
• 14N.2.hl.TZ0.11a.ii: Explain how and why the rate of reaction changes with time.
• 14N.2.hl.TZ0.11b: A Maxwell-Boltzmann energy distribution curve is drawn below. Label both axes and explain, by...
• 14N.1.sl.TZ0.17: Consider the following reaction between hydrogen peroxide, hydrogen ions and iodide...
• 14N.1.sl.TZ0.18: Which quantity can be changed by the use of a catalyst? A.     I and II only B.     I and III...
• 14N.2.sl.TZ0.5b: The Contact process operates at a temperature of 450 °C and a pressure of 2 atm as optimum...
• 14N.2.sl.TZ0.8e: (i)     The experiment is repeated with the same amount of a more effective catalyst,...
• 13N.2.hl.TZ0.1a: The concentration of iodide ions, \({{\text{I}}^ - }\), is assumed to be constant. Outline why...
• 13N.1.hl.TZ0.20: The diagram below shows the energy changes for a reaction with and without a catalyst. Which...
• 13N.2.hl.TZ0.1b: For this mixture the concentration of hydrogen peroxide,...
• 13N.2.hl.TZ0.1e: The colour change occurs when \(1.00 \times {10^{ - 4}}{\text{ mol}}\) of iodine has been formed....
• 13N.2.hl.TZ0.1g: In another experiment, 0.100 g of a black powder was also added while all other concentrations...
• 13N.1.sl.TZ0.18: The diagram below shows the energy changes for a reaction with and without a catalyst. Which...
• 13N.2.sl.TZ0.1j: In a third experiment, 0.100 g of a black powder was also added while all other concentrations...
• 13N.1.sl.TZ0.17: Which factors can increase the rate of a chemical reaction? I.     Increasing the pressure in...
• 13N.2.sl.TZ0.1d: For this mixture the concentration of hydrogen peroxide,...
• 13N.2.sl.TZ0.1i: In a second experiment, the concentration of the hydrogen peroxide was decreased to...
• 13N.2.sl.TZ0.1c: The concentration of iodide ions, \({{\text{I}}^ - }\), is assumed to be constant. Outline why...
• 13N.2.sl.TZ0.1h: The colour change occurs when \(1.00 \times {10^{ - 4}}{\text{ mol}}\) of iodine has been formed....
• 13N.2.sl.TZ0.1k: Explain why increasing the temperature also decreases the time required for the colour to change.
• 13M.2.hl.TZ1.3a: Define the term activation energy, \({E_{\text{a}}}\).
• 13M.1.sl.TZ1.18: Which statement best describes and explains the effect of a catalyst on the rate of a chemical...
• 13M.1.sl.TZ1.17: Which graph best represents the relationship between the average kinetic energy of molecules of a...
• 13M.2.sl.TZ1.8c.i: Deduce the effect of the concentration of...
• 13M.2.sl.TZ1.8c.ii: Suggest why warm sodium hydroxide solution is used.
• 13M.2.hl.TZ2.2a: A catalyst provides an alternative pathway for a reaction, lowering the activation energy,...
• 13M.1.sl.TZ2.18: Which statements explain the increase in the rate of a reaction when the temperature is...
• 13M.2.sl.TZ2.2b: A catalyst provides an alternative pathway for a reaction, lowering the activation energy,...
• 13M.2.sl.TZ2.2c: Sketch two Maxwell–Boltzmann energy distribution curves for a fixed amount of gas at two...
• 12N.2.hl.TZ0.6a: (i)     Define the term rate of reaction. (ii)     Temperature and the addition of a catalyst...
• 12N.2.hl.TZ0.6f.ii: Deduce the rate expression for each step.   Step 1:     Step 2:
• 12N.2.hl.TZ0.6b: (i)     Define the term activation energy, \({E_{\text{a}}}\). (ii)     Sketch the two...
• 12N.2.hl.TZ0.6e.ii: Describe qualitatively the relationship between the rate constant, k, and temperature, T.
• 12N.1.sl.TZ0.17: Which piece of equipment could not be used in an experiment to measure the rate of this...
• 12N.2.sl.TZ0.3c: (i)     Define the term activation energy, \({E_{\text{a}}}\). (ii)     Sketch the two...
• 12N.1.sl.TZ0.18: In which flask will the reaction between 2.0 g of magnesium carbonate and 25 cm3 1.0 mol...
• 10N.2.hl.TZ0.6a: (i)     Use the graph to deduce whether the forward reaction is exothermic or endothermic and...
• 10N.3.hl.TZ0.E4: (a)     (i)     Explain the dependence of the dissociation of diatomic oxygen, O2, and ozone, O3,...
• 10N.1.sl.TZ0.18: Which changes increase the rate of the reaction...
• 10N.1.sl.TZ0.17: A piece of zinc was added to aqueous nitric acid and the volume of hydrogen gas produced was...
• 10N.2.sl.TZ0.6a: (i)     Use the graph to deduce whether the forward reaction is exothermic or endothermic and...
• 09N.2.hl.TZ0.6e.v: Suggest, stating a reason, how the addition of a catalyst at constant pressure and temperature...
• 09N.2.hl.TZ0.6a.ii: Predict the effect on the rate of the forward reaction and on the rate constant if the...
• 09N.2.hl.TZ0.6c: State two situations when the rate of a chemical reaction is equal to the rate constant.
• 09N.1.sl.TZ0.18: Hydrochloric acid is reacted with large pieces of calcium carbonate, the reaction is then...
• 09N.1.sl.TZ0.19: Which statement is true about using sulfuric acid as a catalyst in the following...
• 09N.2.sl.TZ0.5c.i: The concentration of \({{\text{H}}_{\text{2}}}{{\text{O}}_{\text{2}}}\) is increased at constant...
• 09N.2.sl.TZ0.5a.iv: Suggest, stating a reason, how the addition of a catalyst at constant pressure and temperature...
• 09N.2.sl.TZ0.5b: Graphing is an important method in the study of the rates of chemical reaction. Sketch a graph to...
• 09N.2.sl.TZ0.5c.ii: The solution of NaI is prepared from a fine powder instead of large crystals.
• 09N.2.sl.TZ0.5d: Explain why the rate of a reaction increases when the temperature of the system increases.
• 17M.2.sl.TZ2.5a.ii: Sketch, on the same graph, the expected results if the experiment were repeated using powdered...
• 17M.2.sl.TZ2.5a.i: Outline why the rate of the reaction decreases with time.
• 17M.1.sl.TZ2.17: Which methods can be used to monitor the progress of this...
• 17M.1.sl.TZ2.16: Which change does not increase the initial rate of reaction when CaCO3(s) is added to excess...
• 17M.2.hl.TZ1.1b: The student then carried out the experiment at other acid concentrations with all...
• 10M.2.hl.TZ1.2a: Explain why they added water to the mixtures.
• 10M.2.hl.TZ1.2d: (i)     This reaction uses a catalyst. Sketch and annotate the Maxwell-Boltzmann energy...
• 10M.2.sl.TZ1.2: (a)     Discuss whether either Alex’s or Hannah’s hypothesis is correct. (b)     Explain why the...
• 10M.2.sl.TZ2.6c: (i)     Explain the shape of the curve. (ii)     Copy the above graph on your answer sheet and...
• 10M.1.sl.TZ2.18: Which unit could be used for the rate of a chemical reaction? A.     mol B.    ...
• 10M.1.sl.TZ2.19: Which of the following can increase the rate of a chemical reaction? I.     Increasing the...
• 09M.1.sl.TZ1.18: What is the best definition of rate of reaction? A.     The time it takes to use up all the...
• 09M.1.sl.TZ1.19: Which factors can affect reaction rate? I.     The state of the reactants II.     The frequency...
• 09M.1.sl.TZ1.20: Equal masses of powdered calcium carbonate were added to separate solutions of hydrochloric acid....
• 09M.2.sl.TZ1.1d: The reactants had to be stirred vigorously because they formed two distinct layers in the...
• 09M.2.sl.TZ1.1c.iv: State and explain the effect that the addition of the sodium hydroxide catalyst will have on the...
• 09M.2.hl.TZ2.7a.iii: The rate of this reaction in (a) (ii), can be studied by measuring the volume of gas collected...
• 09M.2.hl.TZ2.7a.i: Define the term rate of reaction.
• 09M.2.hl.TZ2.7a.iv: The experiment is repeated using a sample of hydrochloric acid with double the volume, but half...
• 09M.2.hl.TZ2.7d.ii: Construct the enthalpy level diagram and label the activation energy, \({E_{\text{a}}}\), the...
• 09M.2.hl.TZ2.7d.iii: Describe qualitatively the relationship between the rate constant, \(k\), and the temperature,...
• 09M.2.hl.TZ2.7d.i: Define the term activation energy, \({E_{\text{a}}}\).
• 09M.1.sl.TZ2.17: Consider the reaction between magnesium and hydrochloric acid. Which factors will affect the...
• 09M.2.sl.TZ2.5a.iv: State and explain the effect of a catalyst on the position of equilibrium.
• 09M.2.sl.TZ2.4a: Define the term activation energy, \({E_{\text{a}}}\).
• 09M.2.sl.TZ2.4b: State two conditions necessary for a reaction to take place between two reactant particles.
• 09M.2.sl.TZ2.5a.iii: State the effect of a catalyst on the value of \({K_{\text{c}}}\).
• 11M.1.hl.TZ1.20: Curve X on the graph below shows the volume of oxygen formed during the catalytic decomposition...
• 11M.1.sl.TZ1.18: Consider the reaction between gaseous iodine and gaseous...
• 11M.1.sl.TZ1.17: Which statements describe the action of a catalyst? I.     It does not alter the \(\Delta H\)...
• 11M.2.sl.TZ1.3d: A catalyst of copper mixed with zinc oxide and alumina is used in industry for this production of...
• 11M.1.hl.TZ2.20: Sodium carbonate and hydrochloric acid react according to the equation...
• 11M.1.sl.TZ2.19: The reaction below represents the Haber process for the industrial production of...
• 11M.2.sl.TZ2.6a.v: The reaction can be catalysed by adding platinum metal. State and explain what effect the...
• 11M.2.sl.TZ2.7a.ii: List the three characteristic properties of reactant particles which affect the rate of reaction...
• 11M.2.sl.TZ2.7a.iv: Explain why coal dust burns much faster than a large piece of coal with the same mass.
• 11M.2.sl.TZ2.7a.iii: On the axes below sketch two Maxwell-Boltzmann energy distribution curves for the same sample of...
• 11M.2.sl.TZ2.7a.i: Define the term rate of a chemical reaction.
• 12M.1.sl.TZ2.18: The following enthalpy level diagram shows the effect of the addition of a catalyst on a chemical...
• 12M.1.sl.TZ2.17: Which are appropriate units for the rate of a reaction? A.    ...
• 12M.2.sl.TZ2.1c: (i)     Draw a curve on the graph opposite to show how the height of the bubble layer changes...
• 12M.2.sl.TZ2.1a: Explain why the curve reaches a maximum.
• 12M.2.sl.TZ2.1b: Use the graph to calculate the rate of decomposition of hydrogen peroxide at 120 s.
• 11N.1.sl.TZ0.17: A student added 0.20 g of calcium carbonate powder to \({\text{100 c}}{{\text{m}}^{\text{3}}}\)...
• 11N.1.sl.TZ0.18: Which statement about the kinetic theory is not correct? A.     The particles in ice vibrate...
• 11N.2.sl.TZ0.1d.i: It takes just 0.0400 seconds to produce nitrogen gas in the simulation. Calculate the average...
• 11N.2.sl.TZ0.1d.ii: The students also discovered that a small increase in temperature (e.g. 10 °C) causes a large...
• 11N.2.sl.TZ0.6e.i: Define the term rate of reaction.
• 11N.2.sl.TZ0.6b: Define the term activation energy, \({E_{\text{a}}}\).
• 11N.2.sl.TZ0.6d.ii: Sketch the Maxwell-Boltzmann energy distribution curve for a reaction with and without a...