Rates of reaction Flashcards
What happens to the temperature in a neutralisation reaction
It goes up
What happens to the temperature in a displacement reaction
Depending on the metal depends on how much the temp rises if it is magnesium (very reactive) it rises a lot but iron (not reactive) doesn’t rise much
What does rate of reaction mean
The speed of the reaction
Why is it important to control the rate of reaction
For safety reasons and for economic reasons
What is the equation for the rate of reaction
Rate of reaction = amount of reactant used/ time
Or
Amount of product formed/ time
What units do rate of reaction use
g/s g/min
Cm3/s cm3/min
What is the triangular tube called
Conical flask
What is the symbol for hydrochloric acid
HCl
How do we measure how much gas is produced in an experiment
1) put an upturned cylinder into water and as the gas goes in it will displace the water
2) use a gas syringe
3) measure mass of reaction mixture before and after the reaction
As the reaction progresses what happens to the speed of it
It starts of at a certain speed and then get slower and slower until they stop
What happens to the concentration of the reactants as the reaction progresses
It decreases
How do you calculate gradient
Y axis/X axis
What is the limiting reactant
The reactant that runs out first
What is the limiting reactant directly proportional to
Product formed
Why would cotton wool be used as a bung
To prevent the liquid form escaping
How does surface area make a difference to the rate of reaction
The smaller the reactant crushed marbles the faster the rate of reaction because there are more frequent collisions we increase the number of particles available to react. This means more frequent collisions and a greater chance of reaction
How does concentration affect the rate of reaction
If the concentration increases this does the rate of reaction
Calcium carbonate (CaCo3) +hydrochloric acid (HCl)= ???
Calcium chloride (CaCl2) + water(H2O) +carbon dioxide (CO2)
Why does the mass change in a rate of reaction experiment
Because gas produced escapes unless you catch it
In terms of concentration when does the reaction spread up
When there is more concentrated acid therefor a crowded space do more frequent collisions
What does increasing pressure do to the reaction
The reaction speeds up because the space in which the gas particles are moving is smaller so they are closer together increasing the frequency of collisions making them more likely to react
If an reaction has a product with liquids and a solid in it what does it look like
It is cloudy because of the solid
