Osmosis and Percentage Change Concepts

The video tutorial on osmosis by John Spencer explains the movement of water through a partially permeable membrane from high to low concentration. It demonstrates an experiment using potato pieces in different solutions to observe osmosis. The tutorial guides viewers on calculating the percentage change in mass of the potatoes, providing a formula and example. The video concludes with a call to action to like and subscribe.

What is the primary movement involved in osmosis?

• Movement of water from low to high concentration

• Movement of water from high to low concentration

• Movement of sucrose from high to low concentration

• Movement of salt from low to high concentration

What is a characteristic of a partially permeable membrane?

• Allows all particles to pass through

• Blocks all particles from passing through

• Allows only large particles like sucrose to pass through

• Allows only small particles like water to pass through

In the osmosis experiment, what is used to test the effect of different solutions?

• Two pieces of carrot

• Two pieces of cucumber

• Two pieces of potato

• Two pieces of apple

What is the purpose of using different concentration solutions in the experiment?

• To test the effect of temperature on osmosis

• To test the effect of light on osmosis

• To test the effect of different concentrations on osmosis

• To test the effect of time on osmosis

How do you calculate the percentage change in mass?

• Final mass minus initial mass, divided by initial mass, times 100

• Initial mass minus final mass, divided by final mass, times 100

• Initial mass plus final mass, divided by initial mass, times 100

• Final mass plus initial mass, divided by final mass, times 100

What does a positive percentage change in mass indicate?

• A constant mass

• An increase in mass

• No change in mass

• A decrease in mass

If the initial mass is 0.96 grams and the final mass is 1.24 grams, what is the percentage change?

• 30.47%

• 28.47%

• 31.47%

• 29.47%

What should you do if the percentage change is negative?

• It indicates an increase in mass

• It indicates a decrease in mass

• It indicates no change in mass

• It indicates an error in calculation

What is the final step in calculating the percentage change in mass?

• Divide the final mass by the initial mass

• Multiply the result by 100

• Subtract the initial mass from the final mass

• Add the initial and final masses