Speed of reaction Mini Part 1Source:Simple Chem Concepts
Note:If anyone wants the other two parts pls comment and tell me.
Different chemical reactions take place at different speeds.
The amount of reactants and products change during a chemical reaction.
We can measure the speed of reaction by measuring:
– how quickly a product is formed per unit time
– how quickly a reactant is used up per unit time
Speed of Reaction = (Change in Amount of Reactant/Product) / time taken
Or (for reaction that produces a Gas),Speed of Reaction = (Change in Volume of Gas) / time takenWe often see questions in exams relating to RATE GRAPHS - A graph obtained by plotting some measurable quantity (e.g, volume of carbon dioxide produced or loss in mass of flask & contents in the reaction between limestone & hydrochloric acid) against time in order to find the rate of reaction.
Gradient of tangent to any point on the curve
–> Rate of Reaction at any instant
Steeper the gradient
–> faster the reaction
At start of reaction, graph is the steepest
–> Rate at the start of ANY reaction is always Fastest
As reaction progresses, gradient becomes gentler
–> Reaction is Slowing Down
After sometime, the graph levels off
–> point of leveling off signifies the End of Reaction
Let’s check out a question on Rate Graphs!
The answer is A