Rates of Reaction Flashcards
What do chemical reactions always involve?
At least one new substance being formed
What can chemical reactions be detected by?
Precipitation (solid formed when 2 solutions are mixed)
Effervescence (gas produced/ bubbles)
Colour change
Energy change (often heat)
What is an exothermic reaction?
A reaction which releases energy to the surroundings.
What is an endothermic reaction?
A reaction which takes in energy from the surroundings.
At least one new substance being formed when?
Chemical reactions take place.
What is: A reaction which releases energy to the surroundings?
An exothermic reaction.
What is: A reaction which takes in energy from the surroundings?
An endothermic reaction.
For a chemical reaction to occur, what two things need to happen?
Reactant particles have to collide
Colliding particles have to have sufficient energy to form products
What are the four factors that affect the rate of a chemical reaction?
Particle size
Concentration
Temperature
Catalyst
If the particle size is smaller, what happens to the rate of reaction?
The rate of reaction will be increased
If the concentration is increased, what happens to the rate of reaction?
It increased the rate of reaction.
If temperature is increased, what happens to the rate of reaction?
The rate of reaction is increased.
What does a catalyst do?
A catalyst speeds up the rate of a chemical reaction without being used up or changed during the reaction.
What do: Particle size
Concentration
Temperature
Catalyst do?
They affect the rate of a chemical reaction.
What do you need to do to PARTICLE SIZE to increase the rate of reaction?
Make the particle size smaller
