Rate Of Reactions Flashcards
What do chemicals need for a reaction to take place?
Sufficient energy
What are the four ways to increase the rate of reaction?
Change... Concentration Temperature Surface area Catalyst Pressure (if gas)
What is required for a reaction to occur?
Activation energy
What is activation energy used for?
To break bonds that already exist
Explain how changing temperature changes the rate of reaction..
- Particles are constantly moving in reacting chemicals
- Lots of kinetic energy
- Particles gain MORE energy by being heated
- Move faster
- More successful collisions per second
Why does increasing concentration increase the rate of reaction?
- Particles in reacting chemicals move constantly
- Always have kinetic energy
- For a reaction to happen particles must collide
- When increasing concentration it increases the amount of particles to react
- More successful collisions per second
How do you increase the rate of reaction involving a gas?
- Increasing the pressure
- Number of particles in a given volume increases
- Will be more particles
- More successful collisions per second
Why does the rate of reaction increase if the surface area increases?
- More particles available to react
2. More successful collisions per second
Give an example experiment of increasing the surface area
Using large marble chips
Without being cute up it has a small surface area
Once cut small marble chips have large surface area
Although the area has changed the particles still same
How can you speed up a reaction using a catalyst?
- Lower activation energy by offering a alternative path
- Can be used more than once
- Speed up reaction
- Don’t alter product
- Work in EXOTHERMIC and ENDOTHERMIC reactions
How do we calculate the rate of reaction?
Draw a tangent on the curve
Pick two points
Equation for RATE of REACTION
Rate of reaction =
Amount of product produced➗Time
What does the catalyst do to the activation energy?
Reduces it
