Chem unit 2 flashcards 0.0 / 5 ? ChemistryASAQA Created by: RachelCreated on: 26-04-13 14:30 What must happen for a reaction to take place? Two particles must collide with enough energy to break bonds. 1 of 21 State four factors that affect rate of reaction. Increase in temp, increase in concentration, increase in pressure, increase in surface area, use of a catalyst. 2 of 21 What is activation energy? Activation energy is the minimum amount of energy needed to start a reaction. 3 of 21 What does the Maxwell-Botlzmann distribution represent? 'Energy' plotted against 'fraction of particles with that energy'. 4 of 21 Can particles have 0 energy? No. 5 of 21 Which section on a Maxwell-Boltzmann graph represents the number of particles with activation energy? The area under the right of the line. 6 of 21 What affect does temperature have on the Maxwell-Boltzmann curve? The peak is lower and moves to the right. 7 of 21 State the affect of temperature on the particles. More particles will have energy greater than activation energy so a higher percentage of collisions will result in a reaction. 8 of 21 Does a small increase in temperature produce a large increase in the amount of particles with energy higher than activation energy? Yes. 9 of 21 How do catalysts work? Catalysts provide a different pathway for the reaction, one with lower acivation energy. 10 of 21 Name the two types of catalysts. Heterogeneous and Homogeneous. 11 of 21 What is a heterogeneous catalyst? This is when the catalyst is in a different phase to the reactants. 12 of 21 What is a homogeneous catalyst? This is when the catalyst is in the same phase as the reactants. 13 of 21 Why is a catalytic converter in a honey comb structure? To increase the surface area. 14 of 21 What is the general formula of a haloalkane? CnH2n+1X 15 of 21 How do you name haloalkanes? Put the number of the carbon the halogen is bonded to and then use the prefix fluoro chloro bromo iodo to tell which halogen is present. 16 of 21 Is the C-X bond polar? Yes because halogens are more electronegative than carbon. 17 of 21 As you go down group , does the C-X bond get more or less polar? Less polar. 18 of 21 Are haloalkanes soluble? No, the C-X bond is not polar enough to make it soluble in water. 19 of 21 Name the main intermolecular atttractions in haloalkanes. Dipole-dipole. 20 of 21 Does boiling point increase or decrease going down the halogens in group 7? Why? Increases. Becuase there are increased van der Waals forces because the molecules are larger with greater number of electrons. 21 of 21
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