September 8 - R.O.R Flashcards
What are the four signs of a chemical reaction?
Colour Change
Temperature Change
Effervescence
Precipitation
What are the four main factors that affect the rate of reaction?
Temperature
Concentration
Particle Size
Catalysts
Does increase temperature increase or decrease the rate of reaction?
Increases
Does increase in concentration increase or decrease the rate of reaction?
Increases
Does increase in particle size increase or decrease the rate of reaction?
Decreases
Do catalysts increase or decrease the rate of reaction
Increases
What is the formula for calculating the avg. rate of reaction?
Change in quantity OVER Change in time
What is a catalyst?
A chemical which speeds up the rate of reaction without being chemically changed
How does a catalyst speed up a reaction?
Allows the reactant to collide successfully using less energy
Why are catalysts used?
Allow reactions to produce products more quickly
What happens to the catalyst?
It is not chemically changed or used up so it can be used infinitely
What is an enzyme?
A biological catalyst.
Over the course of a reaction…
The rate decreases
The rate of a reaction decreases over time because…
the concentration of the reactants decreases as they are used up
As the concentration of the reactants decreases the frequency of collisions …
Decreases
