Chemistry Revision Flashcards
What does rate of reaction mean?
The speed at which a reaction takes place
How do you find rate of reaction?
Quantity of ractants used divide by time taken
How can there be different units when measuring rate of reaction?
Rate of reaction can be measured by recording the mass in grams (for solids) or the volume in cm cubed (for liquids). The units for reaction rate will be either g/s or cm cubed/s.
What are the factors that can affect the rate of reaction?
Temperature
Concentration/pressure
Surface area
Catalyst
How does temperature,concentration/pressure, surface area and catalyst affect the rate of a reaction. Explain using collision theory.
They speed up the reaction by giving more energy to the particles which is then released by collisions.
How does temperature affect the rate of reaction?
Speeds up the reaction time by giving more kinetic energy to the particles
Using collision theory explain how changing temperature affects the rate of reaction
When the temperature increases the particles are given more kinetic energy to move around and collide with eachother faster which increases the rate of reaction
How does the surface area of a solid increase
Break down or cut down into smaller pieces
How does changing the surface area change the rate of reaction
If you increase the surface area the rate of reaction increases as there more particles to collide with
If you decrease it the rate of reaction decreases because there are less particles to collide with
How does collision theory explain the effect of surface area on the rate of reaction
When there is more surface area it means that there are more particles to collide with which increases the rate of reaction
When there is less surface area it means that there are less particles to collide with which decreases the rate of reaction
How does changing concentration affect the rate of reaction
The more concentration you have in a reaction the more frequent collisions there will be which will speed up the rate of reaction
How does the change of concentration affect the rate of reaction.
Use collission theory
When the concentration is increased there are more particles which result to more frequent collisions and then the rates of reaction increases
How does changing pressure of gaseous reactants affect the rate of reaction
The more pressure there is in the gas the more collisions there are with the particles since the particles increase as the pressure increases
Rate of reaction increases
How does changing pressure of gaseous reactants affect the rate of reaction
Use collission theory to explain it
When increasing the pressure there are more particles to collide with eachother which speed up the rate of reaction
What is the activation energy
The energy required for a energy to start
