Chemistry Rates of Reaction (Chapter 9) Flashcards
what is Collision Theory?
When particles need to collide with sufficient energy in order for a reaction to take place.
What are the four factors that affect the rate of chemical reactions?
1)Temperature
2)Surface area
3)concentration and pressure of gases
4)catalyst
What are 2 ways to make sure that a chemical reaction is most likely to happen?
1) increase the frequency of reacting particles.
2) increase energy they have when they collide.
What is the formula for rate of reaction?
amount of reactant used or amount of product formed / time
What are 2 ways to find the rate of reaction?
1) measure how quickly reactants are used up.
2)measure how quickly the products of the reaction are made.
What happens if you increase the concentration of the reactants?
the rate of reaction increases because there are more particles of the reactants moving around in the same volume of solution.
What happens if you increase the pressure of the reactans?
The rate of reaction increases because squashing the gas particles more closely together, increases the chance that they will collide and react.
How does the effect of temperature increase the rate of reaction?
When heating up a substance, energy is transferred to its particles. This allows for the particles to move around faster, causing them to collide more often.
What happens to the activation energy when increasing the temperature?
When raising the temperature, more particles gain enough energy to overcome the activation energy. This has a bigger impact on the reaction.
What is a catalyst?
A substance that increases the rate of reaction
Why does a catalyst’s size matter?
Allowing catalysts to have the biggest surface area, makes them as effective as possible as the reactions rely on gases reacting on their surfaces.
what are the 3 advantages of using a catalyst?
1)often cheaper to use a catalyst than to pay for extra energy.
2)saves money and the environment, often allows companies to operate at low temperatures and pressures, helps conserve non-renewable resources.
