required practical 9

Question 1

independant varriable

Answer 1

temperature of the water bath

Question 2

dependant varriable

Answer 2

time taken for methylene to change colour

Question 3

control varriable

Answer 3

time in water bath
volume of methylene
yeast and glucose volume

Question 4

how to control the control varriables

Answer 4

use a timer and syringe

Question 5

effect of the control varriables on dependant varriables

Answer 5

too long in the water bath could increase enzyme activity so too many eszyme substate complexes form increasing rate of reaction

Question 6

error

Answer 6

not pressing start on the timer quick enough

Question 7

limitations

Answer 7

temperature of the water bath is inaccurate

Question 8

improvements

Answer 8

use thermostatically controlled waterbath
use a pH buffer
repeat and find the mean

Question 9

what is RP9

Answer 9

temperatures effect on respiration rate