Rates Of Reaction And Temperature Flashcards
What are the main factors that affect reaction rate?
Concentration, pressure, temperature and surface area
What is concentration?
Measure of amount of particles in a given area. You can get higher concentration by increasing the amount of particles or decreasing the volume.
What is pressure?
When you compress gas particles closer together.
What do gas particles have to do to react and what is it called when this happens?
They have to collide with each other at a sufficient speed (fruitful collision).
How can RoR be measured with gasses?
RoR = number of fruitful collisions/second
When ___ is ___ the ___ will ___
When PRESSURE is INCREASED the VOLUME will DECREASE
How does a higher temperature increase RoR?
The higher the temperature, the more kinetic energy the particles will have. This means that they will vibrate more and move quicker.
How does surface area increase RoR?
If particles are reacting with one object, there is not much surface area and less particles will be able to react with the surface at a given point. When this object is divided into two, there is more surface area and more particles can react with the surace at a given point.
If two molecules, A2 and B2, react with eachother to get another molecule, write an equation to present this.
A2+B2 –> 2AB
What is an endothermic reaction?
A reaction where more energy is taken in to break bonds than to make new ones
What is an endothermic reaction?
A reaction where less energy is taken in to break bonds than to make new ones.
Explain in terms of particles why a larger surface area increases the rate of a reaction
The larger the surface area means the more particles that will be able to react with the surface at a given time.
Explain in terms of particles why a catalyst increases rate of reaction
A catalyst reduces the activation energy and because of this there are more fruitful collisions between particles.
When a catalyst is used in an experiment it is not ___
Used up
Different substances may need ____
Different catalysts to speed up the rate of reaction