Edexcel 2 Welcome to your Edexcel 2 Ethanol and methoxymethane are isomers of each other. What type of isomers are they? Functional group isomers Chain isomers Optical isomers Position isomers What is the mechanism of formation of chloroalkanes from alkanes? Free radical substitution Electrophilic substitution Nucleophilic substitution Elimination What is the product when 1-Bromo-3-methylbutane is reacted with KCN in an ethanol/water mixture? 3-methylbutanenitrile 2-methylbutanenitrile Pentanenitrile 1-bromobutane-3-nitrile Which of the following is a correct condition of industrial hydration of alkenes? High pressure Low temperature THe catalyst sodium hydroxide The presence of ethanol Which of the following compounds gives propanone when heated under reflux with excess potassium dichromate? Propan-2-ol 2-methylpropan-2-ol Propan-1-ol Propanoic acid What is the cause of different peaks in the mass spectrum of a molecule? Fragmentation Isoptopes Impurities Background radiation The charge on the molecular ion in the mass spectrum is_________? 1 -1 2 -2 What is the threshold wavenumber beyond which the fingerprint region starts in an IR spectrum? 1500 1700 2500 2000 Which of the following is not a greenhouse gas? Oxygen Carbon Dioxide Methane Nitrogen Oxide In an exothermic reaction, the products have what energy compared to the reactants? Less More Equal Zero Enthalpy changes of combustion of carbon monoxide, hydrogen and methanol are given as -283kJ/mol and -286 kJ/mol and -671kJ/mol respectively. What is the heat of reaction of the formation of methanol from carbon monoxide and hydrogen? -184 kJ/mol 184 kJ/mol 102 kJ/mol -102 kJ/mol Calorimetry is usually used to find out: Enthaply of combustion Enthalpy of formation Bond energy Ionisation energy Hess’s law is a version of the first law of thermodynamics, which is that energy is always conserved Hess's law Enthalpy change Maxwell-Boltzmann's law Born-Haber cycle What can be said about the enthalpy change of neutralisation? It's exothermic It's endothermic It depends on the acid and base It depends on the amount of reactants Which of the following statements is true about the C-H bond?I. The bond energy of C-H is not same for all C-H bondsII. Bond-beaking energy is positiveIII. The C-H bond is polar I and II only II and III only I, II and III I and III only The area under a Maxwell-Boltzmann distribution represents: Total number of particles present Activation energy Mean energy of particles Reaction probability What change causes the Maxwell-Boltzmann distribution curve to shift to the right? Increasing temperature Increasing pressure Increasing concentration Decreasing temperature What is the effect of a catalyst on activation energy? It decreases It increases It remains the same Can increases or decreases What is the effect of increasing surface area on the rate of a reaction? It increases It decreases It remains the same It can increase or decrease A change in the concentration of a substance in unit time is defined as? Rate of reaction Enthalpy change Rate of formation Formation Which of the following statements about catalysts is correct?I. They increase atom economyII. They increase the rate of reactionIII. They increase the activation energy I and II only II only II and III only I, II and III What is the unit of the equilibrium constant for the equilibrium of a reaction between chlorine and hydrogen gas to form hydrogen chloride gas? No units mol/dm3 mol2/dm6 dm3/mol Dynamic equilibrium occurs when forward and backward reactions occur at? Equal rates Zero rate Fast rates Slow rates Le Chatelier’s principle states that if an external condition is changed, the equilibrium will shift to oppose the... Change Products Reactants Atomic spin A stage 2 reaction of a contact process is exothermic. What would increase the product yield? Low temperature High temperature Vanadium(V)oxide catalyst Vacuum conditions Time is Up!