2.4 Rates of Reaction Flashcards
A successful collision is one in which?
A)The particles hit each other
B)Enough energy is transferred for particles to react
C)Enough energy is transferred for particles to bounce off each other
B
What is a catalyst?
A substance that speeds up a reaction without being used up
What is an endothermic reaction?
A reaction that takes in heat energy from the surroundings
What theory can the rate of reaction be explained by ?
The collision theory
What is an exothermic reaction?
Reaction that gives out heat energy to the surroundings
If the temperature of the solution that the particles are in increases what happens to the particles?
As the temperature increases the speed of the particles increases and the particles have more kinetic energy and are more likely to collide successfully.
What are the two different ways to measure the reaction rate ?
The two different ways are :
1) by looking at the rate at which the products are made per unit time
2) by looking at the rate at which the products are used up per unit time
Reactions that show a colour change are also useful what can you time in this the reaction?
You can time how long it takes for a clear solution to change colour or turn an opaque colour
Reactions that produce gases are easy to measure , and there are two ways to do it . What are those two ways ?
You can put them on a balance and record the mass lost or you can measure the volume of gas produced in a gas syringe.
The rate of a reaction can be explained using what theory?
The Collision Theory
If the temperature is increased the particles move … Faster/slower?
Faster
What is a catalyst?
A catalyst speeds up a chemical reaction by providing a route of lower activation energy. It is not used up in the reaction.
Why does reaction rate increase as the concentration increases?
There are more particles so there is a greater chance the particles will collide so the rate of reaction is faster.
Why does reaction rate increase as the temperature increases?
At higher temperatures particles have more energy and move faster, so there is more chance of them colliding and there are more successful collisions.
What theory is used in the rate of reaction?
Collision theory
