Rates of Reaction and Energy Changes Flashcards
What is the rate of a reaction a measure of?
How fast the reaction happens
Give 3 different experiments to follow reaction rates.
1) Precipitation
2) Change in Mass
3) The volume of Gas given off.
Calculate the rate of reaction if a mass balance with a reaction on it read 120g at the beginning and 105.6g at the end if it took 65 seconds to do this.
0.221538462g/s
Describe an experiment you could do to investigate how surface area affects the rate of reaction.
Use this link :https://www.bbc.com/bitesize/guides/zyb4h39/revision/3
Which 2 chemicals are used in the precipitation reaction?
sodium thiosulfate and hydrochloric acid
How do you know when the precipitation reaction is complete?
An x beneath the reaction will disappear.
What is the formula to calculate rate?
gradient= Change in y/change in x
How do you find the gradient of a curve.
Draw a Tangent to the curve then calculate the gradient of the tangent.
Give 3 things you can increase to increase the rate of reaction.
Temperature, Concentration (or Pressure), Surface Area
Why does increasing the temperature increase the rate?
The particles move faster so they will have more collisions. Also reduces amount of energy to take in from the surroundings so the activation energy lowers.
What do catalysts do?
Increase the rate of a reaction
Are catalysts used up during the reaction?
No
What is the catalyst in the Haber process?
Iron
What are enzymes?
Biological Catalyst
Is the hump on a reaction profile larger or smaller with a catalyst?
Smaller
