Please enable JavaScript.
Coggle requires JavaScript to display documents.
CHEMISTRY UNIT 9 - RATE OF CHEMICAL CHANGE & DYNAMIC EQUILIBRIUM…
CHEMISTRY UNIT 9 - RATE OF CHEMICAL CHANGE & DYNAMIC EQUILIBRIUM 
-
Rates of Change
-
Slow reactions e.g.. rusting of iron, chemical weathering like acid rain damage to limestone buildings
In chemical industry the rates of reaction are important as the faster you make chemicals the faster you make money
-
-
4 Factors Affecting Rates of Reaction (increase no. of collisions between reacting particles)
-
-
3) Surface area
-
If one reactant is a solid then breaking it into smaller pieces increases surface area to volume ratio
4) Presence of catalyst
-
Catalysts decrease the activation energy needed for the reaction to occur by providing alternative reaction pathway with lower activation energy.
-
Reaction Graphs
Find speed of reaction by recording amount of product formed or amount of reactant used up over time
-
-
-
Definitions
-
-
Collision theory - all substances are made of particles & these must collide with a particular energy for particles to react
-
Reversible Reactions
-
-
-
-
Dynamic Equilibrium - both reactions still happening but no overall effect as concentrations of reactants & products have reached balance
When at equilibrium doesn't mean amts of reactants & products are equal so equilibrium can be on the right or left
Endothermic & Exothermic
-
Endothermic = takes in energy from surroundings, heat is taken in & fall of temperature
Exothermic = transfers energy to surroundings usually by heating, rise in temperature
eg. Thermal decomposition of hydrated copper sulphate