6. calculating reaction rates

Question 1

what is the reaction rate

Answer 1

the rate at which the product is formed or a reactant is used up

Question 2

equation for reaction rate

Answer 2

reaction rate = amount of reactant used or product formed / time

Question 3

how to measure how quickly a gas product forms using change in mass
3 steps

Answer 3

1. use mass balance to measure mass disappearing from container.
2. when reaction starts, start a stop clock and take measurements as regular time intervals (recording mass and time)
3. when mass stops decreasing reaction finished

Question 4

how to measure how quickly a gaseous product forms using volume of gas given off

Answer 4

1. use gas syringe to measure volume of product
2. when reaction starts, start a stop clock and take measurements as regular time intervals (recording mass and time)
3. when mass stops decreasing reaction finished

Question 5

positives and negatives to measuring how quickly a gaseous product forms using change in mass

Answer 5

+ very accurate
easy to use
- releases gas into room. dangerous if gas is toxic or flammable.

Question 6

+ and - measuring how quickly a gaseous product forms using volume of gas given off

Answer 6

+accurate

- vigorous reactions can blow plunger off

Question 7

how to calculate a gradient

Answer 7

change in y / change in x

Question 8

you can work out reaction rate from ____ of a graph

Answer 8

gradient