Rates of reaction Flashcards
What device measures the volume of gas produced in a reaction
Gas syringe
What are ways to measure rates of reaction ( 4 )
1/ Measuring volume of gas produced
2/ Measuring mass reduction
3/ Measuring time taken for products to disappear (magnesium strips)
4/ Measuring time taken for cross to disappear (solution becoming opaque)
What affects rates of reaction ( 5 )
1/ Surface area 2/ Pressure 3/ Concentration 4/ Temperature 5/ Catalyst
What is the minimum amount of energy required to start a reaction called
Activation energy
For a reaction to occur particles must do what ( 2 )
Collide, with enough energy
Why does increasing concentration increase the rate of reaction
Increases the frequency of success collisions thus increasing rate of reaction
Why does increasing temperature increase the rate of reaction
with heat comes energy, so increases the speed of the particles so they collide more frequently and with more energy so rate of reaction goes up
Why does increasing pressure increase the rate of reaction
Increasing pressure, reduces the amount of space the particles have to move, so the particles are closer and therefore have more chance of colliding
Why does increasing the surface area increase the rate of reaction
Increasing the surface area means more of the surface is exposed so this increases the frequency of collisions and blah blah blah
What is a catalyst
Something that can speed up a reaction, and remains chemically unchanged
Why is a disadvantage of increasing temperature and pressure
It costs more money
True or False: Different catalysts are used fore different reactions
TRUE
What are the benefits of catalysts ( 4 )
1/ Can be used at lower temperatures
2/ Speeds up reactions
3/ re-usable
4/ Lower production cost
What are the down sides to catalysts ( 2 )
1/ Expensive
2/ Toxic
