AQA Physical Chemistry 1 Welcome to your AQA Physical Chemistry 1 Which of the following is not true about electron impact ionisation? It's used for large molecules The sample is injected at low pressure The sample is vapourised High energy electrons are fired at the sample 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 What is the correct order of energies of subshells? 1s < 2s < 2p < 3s < 3p < 4s < 3d 1s > 2s > 2p > 3s > 3p > 3d > 4s 1s < 2s < 2p < 3s < 3p < 3d < 4s 1s > 2s > 2p > 3s > 3p > 4s > 3d What is the concentration of the solution when 16g of sodium chloride is dissolved in 250 cubic centimetres of water? 1.09M 0.9M 0.001M 0.1M Calculate the mass of nitrogen gas that has a pressure of 100 kPa, temperature of 25 degrees centigrade, and a volume of 500 cubic centimetres? (R = 8.31) 0.56g 1g 0.0202g 0.2g How many atoms of magnesium are present in an 18g sample of magnesium metal? 4.5x10^23 6.022x10^23 4x10^22 0.75x10^23 The bond angle in chlorine trifluoride (ClF3) is approximately equal to? 89 degrees 107 degrees 120 degrees 104.5 degrees Which of the following statements is correct?I. Polar molecules are symmetricalII. Non-polar molecules can contain polar bondsIII. Van der Waals forces occur due to temporary dipoles II and III only I, II and III I and III only I and II only What type of bonding exists in ammonium chloride (NH4Cl)? Ionic, covalent, dative covalent Ionic, covalent Ionic, dative covalent Covalent, dative covalent 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 the reaction in the formation of methanol from carbon monoxide and hydrogen? -184 kJ/mol 184 kJ/mol 102 kJ/mol -102 kJ/mol Which of the following statement is true about a C-H bond?I. The bond energy of C-H is not same for all C-H bondsII. The bond-breaking energy is positiveIII. A C-H bond is polar I and II only II and III only I, II and III I and III only Calorimetry is usually used to find out: Enthaply of combustion Enthalpy of formation Bond energy Ionisation energy 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 iIncreases It remains the same It can increase or decrease 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 The oxidation number of carbon in carbonate ion is? +4 -4 +2 -6 Bromine water displaces iodine from potassium iodide. Which of the following is incorrect? Bromine has oxidised Its a redox reaction Iodide ion is an electron donor All statements are incorrect Time is Up!