Rate Of Reaction P1 Flashcards
Rules of collision theory
Reactant particles must collide with each other. These particles must have enough energy
Successful collision
A collision that produces a reaction
Activation energy
Minimum amount of energy needed for a successful collision
Mean rate of reaction equations (both)
Mean rate of reaction = quantity of reactant used or product formed over time taken
Units for rate of reaction
G/s or g/min
What does the steeper the line mean
The greater the rate of reaction
What does it mean when a rate of reaction graph line becomes horizontal
It is a fast reaction as fast reactions finishes sooner than slower ones
Rate of chemical reaction unit
Mol s-1
How do you measure rate of reaction using mass and volume
Rate of reaction = change in mass or volume of product over change in time
What does the greater the frequency of successful collisions mean ?
The greater the rate of reaction
What happens if the concentration of the reacting solution or the pressure of the reacting gas increases
Reactant particles become more crowded. These frequency of collisions increase. The rate of reaction increases
What happens if the surface area to volume ratio of a reacting solid is increased
More reactant particles are exposed at surface. Frequency of collisions increase. The rate of reaction increases
What does the greater the surface area mean to the rate of reaction
Greater the rate of reaction.
What happens when the temp of the reaction mixture is increased
Reactant particles move quicker. Energy of particles increase. Frequency of successful collisions increase. Proportion of successful collisions increase. Rate of reaction increases
What happens when the temp of the reaction mixture is increased
Reactant particles move quicker. Energy of particles increase. Frequency of successful collisions increase. Proportion of successful collisions increase. Rate of reaction increases
A catalyst is a substance that:
Increases the rate of reaction. Does not alter the products. Is not chemically changed or used up
What does a catalyst provide
An alternative pathway that has a lower activation energy
What changes and doesn’t change with a catalyst ? And why
The frequency of successful collisions increases due to increased energy greater than the activation energy within particles. The frequency of collisions doesn’t change
What hazards does hydrochloric acid have and how can you prevent this?
It causes skin and eye radiation. Wear eye protection
What is the hazard in the fizzing in the reaction and how can you prevent this?
Acidic Spray of foam which may damage skin and eyes. Use a large Chronicle flask so there is plenty of space inside and look over the top when adding the calcium carbonate.
Hot sodium thiosulfate solution hazards and precautions
Burns to the skin so do not heat above 60 degrees Celsius
What hazards does sulfur dioxide have and what precautions can be made
Can cause irritation to the eyes and lungs particularly to people with asthma. Make sure the room is well ventilated and avoid breathing directly over the top of the flask.
