the net movement of water molecules through a selectively-permeable membrane from a dilute solution to a concentrated one

causes results to differ by different amounts due to a factor other than the independent variable (the factor we changed)

a difference in the concentration of particles from one area to another

Effect of osmosis and sugar concentration on the mass of plant tissue: analysis

Biology

Pupils will learn about factors that affect the rate of photosynthesis in plants, including temperature, light intensity and carbon dioxide concentration.

Pupils learned how substances essential for chemical reactions, and the products of the reactions, are transported into, around and out of plants, and about factors affecting the rate of water uptake by a plant.

This unit covers the importance of maintaining a constant internal environment, focusing on body temperature control, osmotic balance, and kidney function. It explains the roles of the skin, kidneys, and ADH, and emphasises data extraction, experiment techniques, and accurate data interpretation.

Coordination and control: maintaining a constant internal environment

Calculate the change in mass, in grams (g), for the potato chip in sugar solution at a concentration of 0.25 mol/dm$$^3$$.

Calculate the percentage change in mass (%) for the potato chip in sugar solution at a concentration of 0.25 mol/dm$$^3$$. Give your answer to 2 decimal places.

Calculating the percentage is a more scientific measurement.

Not all the chips have the same final mass.

Not all the chips have the same initial mass.

The percentage is closer to the true value.

Why is it necessary to calculate the percentage change in mass before comparing the effect of concentration on the potato chips?

Calculating the percentage change in mass helps to remove __________ error from the results.

Match each direction of water movement to where it is shown on the graph.

The point on the line where the change in mass was the most positive.

The point on the line where the change in mass was the most negative.

The point where the line crosses the x-axis.

The point where the line crosses the y-axis.

Which point on the graph enables us to estimate the concentration of sugar inside the potato chip cells?

Match each variable to the correct example when investigating the effect of sugar solution concentration on potato chips.

When investigating the effect of sugar solution concentration on potato chips, which piece of apparatus was used to control the temperature?

At which concentration did the potato chip decrease in mass? 

Which concentration caused the potato chips to lose water by osmosis? 

Lucas: Potato chips will gain mass in the most concentrated solutions.

Sam: Potato chips will lose mass in the most concentrated solutions.

Laura: The most concentrated solutions will have no effect on the potato chips.

Water can move out of and into potato chips because the potato cells have a selectively-{{}} membrane.

Introduction

What will you need for this lesson?

Are you ready to learn?

Equipment

Worksheet