C8 0.0 / 5 ? ChemistryEquilibriumGCSEAQA Created by: sophielouise277Created on: 28-01-19 18:07 What are the two ways to work out the rate of a chemical reaction? How quickly the reactants are used up as they make products or the products of the reaction are made 1 of 22 What is the first technique to measure the rate of a chemical reaction?* Measure the decreasing mass of a reaction mixture 2 of 22 What is the second technique to measure the rate of a chemical reaction?* Measure the increasing volume of a gas given off 3 of 22 What is the third technique on measuring the rate of a reaction?* Measure decreasing light through a solution 4 of 22 Equation for measuring the rate of a reaction? Mean rate = quantity of reactant or product/ time 5 of 22 What is the collision theory? Reacting particles have to collide with energy to cause a reaction 6 of 22 What is activation energy? Minimum energy needed for particles to react 7 of 22 What happens if you increase the SA:V ratio? Increases frequency of collisions 8 of 22 How does raising the temp increase rate of reaction? Collisions more often and with more energy. 9 of 22 Why is there more collisions in a given time? A higher proportion of particles have greater energy than the activation energy. 10 of 22 What happens if you increase the concentration of reactants in a solution? Increases rate of reaction as more particles moving around in same volume 11 of 22 What happens if you increase the pressure of reacting gases? Squashes gas particles are more closely together so increases chance of collision 12 of 22 How do catalysts work? They increase the rates of reaction by providing an alternate reaction pathway 13 of 22 How do catalysts help with industries? They reduce costs of upgrading to higher pressures and temps. 14 of 22 What else can catalysts do? Combat climate change 15 of 22 What is le chateliers principle? A change in conditions introduced to a system, position of equil shifts to cancel out change 16 of 22 What happens when the forward reaction produces more molecules of gas? An increase in pressure decreases the amount of products formed and a decrease in pressure increases the amount of products formed 17 of 22 What happens if the forward reaction produces fewer molecules of gas? An increase in pressure increases the amount of products formed and a decrease in pressure decreases the amount of products formed 18 of 22 What happens if the forward reaction is exothermic? (Temp) An increase in temp decreases amount of prodcuts and a decrease in temp increases the amount of products formed 19 of 22 What happens if the forward reaction is endothermic? An increase in temp increases amount of product and a decrease in temp increase product 20 of 22 What happens to favouring if u increase temp? Favours endo reaction 21 of 22 What happens to favouring if decrease temp? Favours exo reaction 22 of 22
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