WorksheetsOsmosis Core Practical TIN
Total questions: 15
Worksheet time: 40mins
Recall the meaning of the term independent variable
The variable that you keep the same
The variable that you change
Th variable that you monitor
The variable that you measure
Recall the meaning of the term dependent variable
The variable that you keep the same
The variable that you change
Th variable that you monitor
The variable that you measure
Recall the meaning of the term control variable
The variable that you keep the same
The variable that you change
Th variable that you monitor
The variable that you measure
A low solute (sucrose) solution =
a high water concentration
a low water concentration
Recall two factors you must control when investigating osmosis in potatoes
the amount of sucrose
volume of the sucrose solution
surface area of the potato
the volume of water
Recall the definition of Osmosis
Recall the definition of Osmosis
The pieces of potato are blotted dry before they are re-weighed to remove excess (a) .
Give one way in which the accuracy of results could be increased in an investigation
Take your time to complete the investigation
Repeat the investigation
Repeat the investigation and calculate an average
Do a trial run first to get all the errors out of your system
Calculate the % change in mass for Chip 6 in the table.
Give your answer to an appropriate number of decimal places.
% change in mass = (change in mass ÷ starting mass) x 100
-27.0
27.03
27.0
27.03
What piece of equipment would you use to measure the volume of water
Measuring cylinder
Conical flask
Pipette
Weighing scales
What piece of equipment would you use to determine the mass of the potato chips?
Weighing scales
Measuring cylinder
Pipette
Conical flask
What three pieces of equipment do you need to ensure that each potato chip has the same surface area?
Knife
Ruler
Potato corer/cork borer
Scales
Potato
The potato chips must be left for at least 15 minutes in the sucrose to allow (a) to occur.
Calculate the % change in mass for Chip 2 in the table.
Give your answer to an appropriate number of decimal places.
% change in mass = (change in mass ÷ starting mass) x 100
16.6
16.59919028
-16.6
-17.0
