Rate of reaction Flashcards
What is rate of reaction?
The speed of a reaction
When do reactions take place?
When particles collide with a certain amount of energy
What is activation energy?
The minimum amount of energy needed
2 things the rate of reaction depends on
The frequency of collisions between particles.
The energy at which the particles collide
Rate of reaction formula
Rate of reaction= amount of reactant used/time OR amount of product formed/time
Rate of reaction units
g/s g/min
cm^3/s cm^/min
Effects of concentration on rate of reaction
The higher the concentration of a dissolved reactant, the faster the rate of reaction. At a higher concentration, there are more particles in the same amount of space making them more likely to collide.
Effects of pressure on rate of reaction
As the pressure increases, the space in which gas particles are moving becomes smaller. The gas particles become close together, increasing the frequency of collision.
Effects of catalysts on the rate of reaction
Catalysts are substances that change the rate of reaction without being used up in the reaction. They do not produce more product, they just produce the same amount quicker. Most catalysts lower activation energy.
Effect of surface area on rate of reaction
If the surface area of a reactant is increased: more particles are exposed to the other reactant. there is a greater chance of particles colliding, which leads to more successful collisions per second. the rate of reaction increases.
Reactivity series
Potassium, Sodium, Calcium, Magnesium, Aluminium, Carbon, Zinc, Iron, Tin, Lead, Hydrogen, Copper, Mercury, Silver, Gold, Platinum.
Displacement reaction
All acids have hydrogen and the metal tries to displace it so a metal below hydrogen will not react with dilute acids.
