Topic 6(The rate and extent of Chemical change) Flashcards
The rate of chemical reaction
How fast reactants are changed into products.
Graphs
The steeper the line, the faster the rate of reaction
Factors that effect the rate of reaction
Temperature
Surface area
concentration of a solution/ pressure of gas
presence of a catalyst
Equation for rate of reaction
Amount of reactants used/amount of products formed/time
Chromatography practical
How paper chromatography can be used to identify substances.
1. Use a pencil to draw a line across a piece of chromatography paper.
2. Dip it in water and watch it fill the paper.
3. Dry the paper and you will be able to identify the different colours as they will stop going up the paper at different points.
What does the rate of reaction show
the amount of product formed or amount of product used up.
How to find the rate of reaction at a particular time on a graph
Equilibrium
the point at the rate of the forward reaction is equal to the rate of reverse reaction.
Closed system
None of the reactants or products can escape and nothing else can get in.
Reversable actions
Can be endothermic or exothermic
Le Chatelier’s Principle
Idea that if you change the conditions of a reversible reaction at equilibrium, the system will try to counteract that change.
Examples of Le Chatelier’s Principle
If you decrease the temperature, the equilibrium will move in a exothermic reaction to produce more heat.
Required practical
