Chemistry - Rates Of Reaction And Collision Thoery Flashcards
What is the Rate of Reaction?
The speed at which a reaction takes place.
How can the rate of reaction be measured?
By measuring how quickly the reactants are used up or how quickly the products are formed.
What are the three main methods to measure the rate of reaction?
- Change in mass
- Volume of gas formed
- Formation of a precipitate
What happens to the mass of the flask when gas is formed during a reaction?
The mass of the flask and contents decreases.
What instrument is used to collect gas produced during a reaction?
A gas syringe.
What indicates the formation of a precipitate in a reaction?
The solution turns milky/cloudy.
What does collision theory state about reactions?
Reacting particles must successfully collide for a reaction to happen.
What is activation energy?
The minimum energy reacting particles must have when they collide for the reaction to take place.
How does increasing the rate of reaction affect successful collisions?
It increases the chance/frequency of successful collisions.
What are the four ways to change the rate of a reaction?
- Temperature
- Concentration
- Surface area
- Catalyst
What effect does increasing temperature have on particle movement?
It makes the particles move faster.
How does higher temperature affect the rate of reaction?
It increases the chance of successful collisions, leading to a faster rate of reaction.
What happens to the number of reacting particles when concentration increases?
The number of reacting particles increases.
How does higher pressure affect the rate of reaction?
It increases the chance of successful collisions, leading to a faster rate of reaction.
What is the effect of breaking a solid into smaller pieces on the surface area?
It increases the surface area.
