Rates Flashcards
(8 cards)
What is the formula for calculating rate of reaction?
Rate = Amount of reactant used or product formed ÷ Time
What are four factors that affect the rate of reaction?
Temperature
Concentration (or pressure for gases)
Surface area
Use of a catalyst
How does increasing temperature affect the rate?
It increases the rate by giving particles more energy, so they collide more frequently and with more energy.
How does increasing concentration affect the rate?
More particles in the same volume → more frequent collisions → faster rate.
How does increasing surface area affect the rate?
More area for collisions to occur → more frequent collisions → faster rate.
How does a catalyst affect the rate of reaction?
It lowers the activation energy needed for a reaction to occur, making it happen faster.
What is activation energy?
The minimum amount of energy that particles must have to react.
How can you measure the rate of reaction in an experiment?
Measure gas produced over time (e.g. with a gas syringe)
Observe colour change or precipitation
Measure mass loss (if gas escapes)
