Rate of Reaction Flashcards
Rate of reaction
the speed at which a reaction occurs, chemical reactions don’t occur at the same speed (some reactions are quick, some are slow)
Factors that affect rate of reaction
concentration, surface area, temperature and catalyst
Concentration affect on rate of reaction
An increase in concentration usually speeds up a reaction, while a decrease slows down a reaction.
Surface Area affect on rate of reaction
The speed of a chemical reaction depends on how quickly the reactants can collide with each other. When reactants can bump into each other more quickly, they will react more quickly. If the surface area of a reactant is increased: more particles are exposed to the other reactant and there is a greater chance of particles colliding, which leads to more successful collisions per second meaning the rate of reaction increases.
Temperature affect on rate of reaction
Higher temperature (faster reaction rate - they move faster and collide frequently), lower temperature (slower reaction rate - move slower and don’t collide).
Catalyst
A catalyst is a substance that speeds up the rate of reaction without being used up or changed.
Exothermic and endothermic reactions
fundamental concepts in chemistry that describe the energy changes that occur during chemical reactions
Exothermic reaction
EXIT
release energy into the surroundings. In these reactions, the products have lower energy than the reactants
Endothermic reaction
ENTER
absorb energy from the surroundings. In these reactions the products have a higher energy level than the reactants
A method to measure the rate of reaction
Change in concentration of reactants or products
A method to measure the rate of reaction
Gas evolution
A method to measure the rate of reaction
Temperature change
A method to measure the rate of reaction
Colour change
A method to measure the rate of reaction
Mass change
