Topic 16 - Chemical Kinetics (HL)
Question 1
HLPaper 1The reaction between NO2 and F2 gives the following rate data at a certain temperature.
What is the overall order of reaction?
Question 2
HLPaper 1Which energy profile diagram represents an exothermic SN1 reaction?
Question 3
HLPaper 2The following mechanism is proposed for a reaction:
A + B → C + D slow step
D + B → A + E fast step
Classify substances B and D as reactant, product, catalyst, or intermediate, based on the proposed mechanism.
Deduce the rate expression.
Calculate the initial rate of reaction for experiment 2, if measured under the same conditions.
Question 4
HLPaper 1When X reacts with Y to give Z, the following graph is plotted. What can be deduced from the graph?
Question 5
HLPaper 1Which graph is obtained from a first order reaction?
Question 6
HLPaper 1What is the activation energy according to the following plot of the linear form of the Arrhenius equation?
Arrhenius equation:k=Ae-EaRT.
Question 7
HLPaper 2Oxygen exists as two allotropes, diatomic oxygen, O2, and ozone, O3.
Draw a Lewis (electron dot) structure for ozone.
a(i).
Discuss the relative length of the two O−Obonds in ozone.
a(ii).
Explain why there are frequencies of UV light that will dissociate O3 but not O2.
Explain, using equations, how the presence of CCl2F2 results in a chain reaction that decreases the concentration of ozone in the stratosphere.
Question 8
HLPaper 2Analytical chemistry uses instruments to separate, identify, and quantify matter.
Nitric oxide reacts with chlorine.
2NO (g) + Cl2 (g) → 2NOCl (g)
The following experimental data were obtained at 101.3 kPa and 263 K.
Menthol is an organic compound containing carbon, hydrogen and oxygen.
Outline how this spectrum is related to the energy levels in the hydrogen atom.
A sample of magnesium has the following isotopic composition.
Calculate the relative atomic mass of magnesium based on this data, giving youranswer to two decimal places.
Complete combustion of 0.1595 g of menthol produces 0.4490 g of carbon dioxide and0.1840 g of water. Determine the empirical formula of the compound showing yourworking.
0.150 g sample of menthol, when vaporized, had a volume of 0.0337 dm3 at 150 °C and100.2 kPa. Calculate its molar mass showing your working.
Determine the molecular formula of menthol using your answers from parts (d)(i)and (ii).
Deduce the order of reaction with respect to Cl2 and NO.
State the rate expression for the reaction.
Calculate the value of the rate constant at 263 K.
Question 9
HLPaper 1Which is the first step in the CFC-catalysed destruction of ozone in UV light?
Question 10
HLPaper 1Which statement is correct about a catalyst?
