Rates of Reaction Flashcards
factors effecting rates of reaction, comparing reactions, following the course of a reaction and calculating the average rate of a reaction
Name at least four signs that a chemical reaction has taken place.
Change in colour Gas given off - bubbles/ fizzing Noise given off Light given off Temperature change New substance formed Precipitation (solid being formed)
Give an example of a SLOW chemical reaction.
Rusting
Give an example of a MEDIUM chemical reaction.
Making toast
Give an example of a FAST chemical reaction.
Burning/ Combustion
Name at least two factors that will affect the rate of a chemical reactions.
Changing the temperature
Adding or removing a catalyst
Changing the particle size/ surface area
Changing the concentration
How do you write the equation for a chemical reaction?
The reactants go on the left-hand side of an arrow and the products go on the right-hand side
What goes of the left-hand side of a chemical reaction equation?
Reactants
What goes of the right-hand side of a chemical reaction equation?
Products
What does the graph showing the course of an equation look like?
as the concentration of the reactants drops (i.e. the reactants are used up), the concentration of the products climb
What effect does the surface area have on the rate of reaction?
As the surface area of a reactant increases (smaller particles) the rate of reaction increases
What effect does the temperature have on the rate of reaction?
As the temperature of a reactant increases the rate of reaction increases/ gets faster.
What does the flat section of a graph represent?
The final volume/ mass of the end of the reaction
What is the flat section of a graph called?
Plateau
What effect does the concentration have on the rate of reaction?
As the concentration of a reactant increases the rate of reaction increases
What is the equation for the average rate of reaction?
Avg. rate = change in concentration of a reactant or of a product / time taken for the change
