Rate Of Reaction Flashcards
What is the rate of reaction
How fast the reactants are changed into products
What must happen for a reaction to happen
Particles must collide with enough energy in order to react
Rate of reaction depends on
The collision frequency
The energy transferred during the collisions
What does the rate of reaction depend on
Temperature
Concentration and pressure
Surface area
Catalyst
How does increasing the temperature affect the rate of reaction
When the temp is increased the particles move faster
As they move faster there will be more frequent collisions
And as they move faster they will have more energy so more particles will have enough energy for the reaction
How does the concentration or pressure effect rate of reaction
If a solution is more concentrated it means there are more if particles breaking about in the same volume of solvents
And also the pressure of gas increased it means the same number if particles occupied in a smaller space
This means collisions between particles will occur more frequency
How does the surface affect the rate of reaction
If there is a bigger surface area to volume ratio it means there will be more area to work at so there will be more frequent collisions
How does catalysts effect the rate of reaction
It creates an alternative activations energy pathway
So it decreases the activation energy
How do you calculate the rate of reaction
Amount of reactants used or amount formed divided my time
Magnesium and hydrochloric acid practical
Start by adding a set of volume of dilute hydrochloric acid into a conical flask
Add magnesium ribbon to the acid and quickly attarch an empty gas syringe
Start a stopwatch and take the readings of the volume of gas in syringe and the time
Plot results
Sodium thiosulfate and hydrochloric acid practical
They are both clear and when reacted they create a yellow precipitate and sulfur
1. Add set volume of dilute sodium thiosulfate to a conical flask
2.place the flask in a piece of paper with a blank cross drawn on it
3.add some dilute hci to the flask and start a stopwatch
Time how long it takes for the cross to disappear
What does a tangent do on a point
Shows the gradient at that certain point
