Rates Of Reaction N5 U1 P1 Flashcards
As ___ are used up during the process, the ____ will decrease, and the reaction ___ ___
As reactants are used up during the process, the rate will decrease, and the reaction slows down
How should rate graphs be drawn
In scatter plots (best fitted line)
Using a gas syringe reaction
To collect soluble gases
Gas flow must not be restricted
Graduation marks must be present
Using a balance reaction
Monitors the gas lost during a reaction
Sometimes a cotton wool is placed in the neck of conical flask as a safety feature to stop acid splashing, not gas escaping
Reading on balance decreases due to gas escaping
Collection over water reaction
Delivery tube is not cut of by any lines and does not go through side of trough
Graduation marks allow measurement to be taken
How is the reaction rate measured+ formula
We can measure the rate of reaction as the change in quantity being measured against time
🔼quantity
Rate=——————
🔼time
Units of rate- mass against seconds
gs-1
Units of rate- change in concentration against minutes
moll-1min-1
Units of rate- change in volume against time
cm3s-1
Factors affecting rate
The rate can be controlled by altering:
Temperature
Concentration
Particle size
Use of catalyst
Collisions
The greater number of successful collisions
The greater increase in reaction rate
(Successful collisions- when atoms and molecule collide to make a chemical reaction)
Effect of temperature
Increased
Particles have more energy
Move quickly
Collide more often
Increased rate of reaction
Effect of concentration
Increased
More reactant particles moving together
More collisions can take place
Faster rate
Effect of particle size
Decreasing particle size
Increasing surface area
More collisions can take place
Increased rate
Effect of catalyst
Provides surface for reactions, successful collisions.
Allows lower temperature
Speeds up chemical reaction
Remains chemically unchanged
