Tempeature & Reaction Rate (make cards) Flashcards
The temperature of a substance is…
A measurement related to the average kinetic energy of the particles.
In a substance with high temperature, the average speed of the particles is faster than…
in a substance with a lower temperature.
In a substance with lower temperature, the average speed of the particles is slower than…
in a substance with a higher temperature
Increasing the temperature of reactants makes them move around faster. This means 2 things
1) makes the particles collide with each other more frequently
2)The particles have higher energy when they collide
Why is the activation energy needed?
To break the bonds of the reactants so that new bonds can form to create the products.
A reaction will occur when…
reactant particles collide with sufficient energy to overcome the activation energy.
Individual reactant particles have different energies so collisions…
between the particles occur at a range of entries
When the temperature is low only a small proportion of particles have energy above the activation energy. This means…
only a few successful collisions occur per second, and the rate of reaction is slow.
When the temperature is higher a greater proportion of particles have energy above the activation energy. This means…
there are more successful collisions occurring each second and the rate of reaction is faster.
increasing the temperature of the reactant has two consequences
1- particles will collide more frequently
2- A higher proportion of collisions occur with sufficient energy to overcome the activation energy.
What do both of the consequences of increasing the temperature result in?
A greater number of successful collisions occurring in a given amount of time therefore increasing the temperate increases the rate of reaction.
