essential practicals Flashcards
temperature Enzyme activity
how fast a product apears
catalase breaking down h2o2 into h2 and o2
measuring how much oxygen is produced in a certain amount of time
add h202 to a boiling tube, add catalase e.g. 1cm3 of potato
how fast a product dissappears
amylase breaks starch into maltose
stect starch using iodine
set up apparatus, put iodinge on the every spotting tile
every ten seconds add solution of starch and amylase enzyme
repeat at different temps
energy from food
dried food
weigh and place onto a needle
next add a set volume of water
measure temp of water burn and measure temp again
use equation energy in food = mass of water x temp of water x 4.2
calculate amount of energy in Joules per gram.
insulating boiling tube would make it more acc
how to show plants have chlorophyll
take a variegated leaf, measure which parts are green and which parts are not,
only parts of plant with green will go blue black
co2 testing plant
co2 is needed for photosynthesis
soda lime will absorb co2
leave plant in there for a while leaves will not turn blue blac
no starch therofre been made
plant test without light
leave plant in the dark for a while, this means that it will have used up its starch sources,
therefore when testing for starch will nto go blue black
detecting co2
soak some dried beans for a day or two until they start to germinate boil similar sized beans place on a gauze above co2 indicator seal tubes bung leave apparatus for a set amount of time alive beans go yellow dead go orange
gas exchange in plants
add volume of co2 indicator to 4 test tubes
control is one of them
put plants in other 3
gauze, foil uncovered,
foil goes yellow large respiration
gauze orange
uncovered yellow photosynthesis taking place
investigating the release of CO2 in your breath
set up two bloiling tubes
put your mouth around the mouthpiece
breathe in and out several times
as you bre
