The Rate And Extent Of Chemical Change Flashcards
How do you calculate the mean rate of reaction
Quantity of reaction used or formed/time taken
How can the quantity of reactant or product to be measured
Mass in grams
volume in cm³
The steeper the slope the faster
The reaction
Which factors affect the rate of chemical reactions
The concentration of reactants in solution
the pressure of reacting gases
the surface area of solid reactants
the temperature
presence of catalyst
What is the collision theory
Chemical reactions can only take place when the reacting particles collide with each other. the collision must have a significant energy
What is the rate of a chemical reaction determined by
The frequency of successful collisions
What does frequency mean
The number of successful collision per second
What is the minimum amount of energy that particles must have to react called
Activation energy
A student increases the concentration of reactants in a solution what happens to the pressure and surface area
The pressure of reacting gases and the surface area of a solid reactants increases the frequency of collisions and increases the rate of reaction
Temperature is increased what happens to the frequency
The frequency of collisions increase and makes the conditions more energetics and so increases the rate of reaction
What is a hypothesis
It’s a proposal that could explain a fact or an observation
(In science a hypothesis must be testable)
Sulfur makes the solution go cloudy what is this called
Cloudiness turbidity 
What’s the use of catalysts
Catalysts change the rate of chemical reactions but are not used up during the reaction
What do enzymes act as
Catalyst in biological systems
What does a catalyst do
A Catalyst increases the rate of reaction by providing different pathway for the reaction that has lower activation rate. Different reactions need different catalyst
