OCR Module 3 Welcome to your OCR Module 3 Which of the following correctly puts the elements in order of increasing first ionisation energy? Na, Al, Mg Na, Mg, Al Al, Mg, Na Mg, Al, Na Which of the following is not true about ionisation energies of an element? Difference between successive ionisation energies of an element is uniform It is defined for gaseous atoms It is affected by the distance of the electron from the nucleus It decreases down a group Which of the following statements about the third period is not true as we move from left to right? Atomic radius increases First ionisation energy increases Elements change from metal to non-metal Electronegativity increases Which of the following is incorrect about magnesium? Magnesium reacts with steam to produce magnesium hydroxide Magnesium has shorter atomic radius than calcium Hydroxide of magnesium is insoluble in water Magnesium has a higher melting point than barium Which of the following lists elements in order of increasing reactivity? Mg, Ca, Sr, Ba Ba, Sr, Ca, Mg Mg, Ba, Sr, Ca Ca, Ba, Sr, Mg Which of the following reacts with potassium bromide to give a yellow solution? Aqueous chlorine Aqueous fluorine Aqueous iodine Aqueous silver nitrate What is the reaction called in which chlorine reacts with sodium hydroxide to form sodium chlorate (I)? Disproportionation Oxidation Reduction Displacement Which halide ion gives a pale yellow precipitate with silver nitrate? Iodide ion Fluoride ion Chloride ion Bromide ion Calorimetry is usually used to find out: Enthaply of combustion Enthalpy of formation Bond energy Ionisation energy The enthalpy change for a reaction is independent of the route by which the chemical change takes place. This statement is the definition of what? Hess's law Enthalpy change Maxwell-Boltzmann law Born-Haber cycle 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 What is the effect of a catalyst on activation energy? It decreases It increases It remains the same It can increase or decrease What change causes a Maxwell-Boltzmann distribution curve to shift to the right? Increasing temperature Increasing pressure Increasing concentration Decreasing temperature The formation of ammonia from nitrogen and hydrogen is exothermic. Under equilibrium, what change would increase the yield of ammonia the most? Increasing pressure; decreasing temperature Increasing temperature; decreasing pressure Increasing pressure; increasing temperature Decreasing pressure; decreasing temperature 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 Which of the following is true about catalysts?I. They lower the activation energyII. They increase product yield in equilibrium reactionsIII. They increase the equilibrium constant I only I and II only I and III only I, II and III Time is Up!