The rate and extent of chemical changes 0.0 / 5 ? ChemistryCalculating rates of reaction, Factors which affect the rates of chemical reactions, Collision theory and activation energy and CatalystsGCSEAQA Created by: holly.preston12345Created on: 20-12-18 13:58 Calculating rates of reaction Calculating rates of reaction 1 of 19 What is the equation for the rate of chemical reaction (1): Rate = quantity of reactant used/ time taken 2 of 19 What is the equation for the rate of chemical reaction (2): Rate = quantity of product formed/ time taken 3 of 19 What can the quantity of reactant or product be measured by? Mass in grams or volume in cm3 4 of 19 What is the units for rate of reaction in moles? Moles per second (mol/s) 5 of 19 Factors which affect the rates of chemical reactions Factors which affect the rates of chemical reactions 6 of 19 Give 1 factor that affects the rate of reactions and explain how: Temperature- the higher the temperature, the quicker the rate of reaction 7 of 19 Give 1 factor that affects the rate of reactions and explain how: Concentration- the higher the concentration, the quicker the rate of reaction 8 of 19 Give 1 factor that affects the rate of reactions and explain how: Surface area- the larger the surface area of a reactant solid, the quicker the rate of reaction 9 of 19 Give 1 factor that affects the rate of reactions and explain how: Pressure (of gases)- When gases react, the higher the pressure upon them, the quicker the rate of reaction 10 of 19 Collision theory and activation energy Collision theory and activation energy 11 of 19 According to collision theory when can chemical reactions only occur? When reacting particles collide with each other with sufficient energy 12 of 19 What is activation energy? This is the minimum amount of energy colliding particles in a reaction need in order to react 13 of 19 By increases the temperature, what happens? It increases the frequency of collisions and makes the collisions more energetic, therefore increasing the rate of reaction 14 of 19 By increases the concentration, pressure and surface area what happens? It increases the frequency of collisions, therefore increasing the rate of reaction 15 of 19 Catalysts Catalysts 16 of 19 What does a catalyst do? A catalyst changes the rate of a chemical reaction but is not used in the reaction 17 of 19 What are enzymes? These are biological catalysts 18 of 19 How do catalysts increse the rate of reaction? Catalysts provide a different reaction pathway where reactants do not require as much energy to react when they collide 19 of 19
Comments
No comments have yet been made