Rates of reaction Flashcards
What are the 4 factors that affect the rate of reaction?
Temperature, concentration, particle size, use of a catalyst
What is Collision theory?
For a reaction to occur, the particles that are reacting must collide with each other.
What happens to the rate of reaction if the temperature increases?
If the temperature increases, the particles have more energy and so move quicker which increases the rate of reaction as particles collide more often
How does concentration affect the rate of reaction?
If the concentration of reactants is increased that a more reactant particles moving together which will result in more collisions which increases the rate of reaction.
How does the particle size impact the rate of reaction?
If you decrease the particle size of a reactant the surface area increases which leads to a higher chance of collisions increasing the rate of reaction, so the smaller the particle size the faster the rate of reaction.
How does the use of the catalyst affect the rate of reaction?
A catalyst speeds up the rate of reaction but is not used up in the reaction.
What does a catalyst do?
If a catalyst is present the reacting particles can collide more successfully with less energy so a reaction can take place at a lower temperature.
What are enzymes?
Biological catalysts
What are the 3 ways to determine the rate of reaction?
Changes in the concentration, mass or volume of the reactants or products
What are the three methods of measuring the rate of reaction in the lab?
With a mass balance, with a gas syringe, with a trough of water and measuring cylinder
What is the equation for rate of reaction?
Average rate = change in quantity/change in time
why does the rate of reaction slow down towards the end of the reaction?
because the reactants have been used up
-ate at the end of a chemical?
oxygen is present
-ide at the end of a chemical?
2 elements are present
