Rates of reaction Flashcards
Rate of reaction
The change in concentration of a reactant of a product with time
Equation of rate
Change in concentration of a reactant or product/time taken for this change
How do you express the rate
Change in the volume of gas produced per second
change in mass of the reaction mixture per second
Best unit is mol/dm³/s
How to measure the course of the rate of reaction
The decrease in mass
The increase in volume gas
How do you measure the volume of gas
You connect your reaction mixture to a pipe which feeds the gas to the gas syringe
What increases the rate of reaction
Increasing the concentration of the reactant
What increases the rate of reaction of a solid
Increasing its surface area
What happens when the reactant has smaller particles
The rate of reaction increases
What happens when you increase tempurature
The rate of reaction increases
Doubles every 10°C
What is a cataylst
A substance that seeds up a chemical reaction
It is no used up in the reaction
The mass of a cataylst is the same at the end as at the start of the reaction
Chemical composition stays the same
What is an enzyme
A Biological cataylst used to help speed up reactions
