6 marker required practicles

Question 1

rates of reaction

Answer 1

-For Measuring Gas:
- use conical flask, with tube leading to measuring cylinder with water
-record volume of gas made very 10 seconds

-plot results on a graph, x axis being the time, y axis being the volume of gas

-gradient = rate of reaction

-repeat for different concentrations of acid

Question 2

chromatography

Answer 2

-put a drop of mixture near the bottom of a piece of chromatography paper (stationary phase)

-draw a pencil line (mobile phase), acts as reference point

-secure paper on a rod over a beaker with a small amount of distilled water such that the bottom of the paper touches it

-wait for the water to move (diffuse) up the paper (through capillary action), moves particles from the mixture upwards

-calculate Rf values, subsatance movement divide by water movement

-movement is calculated from the pencil line