Osmosis

• What is osmosis?

  Movement of water molecules across a membrane
• What happens if you understand diffusion?

  Osmosis will be a breeze
• What is a special case of diffusion?

  Osmosis
• What does osmosis involve?

  Movement of water molecules across a permeable membrane
• How does osmosis occur between regions of different water concentrations?

  Water moves from high to low concentration
• What is a partially permeable membrane?

  A membrane that allows some molecules to pass
• What types of molecules can pass through a partially permeable membrane?

  Tiny molecules like water
• What happens to larger molecules during osmosis?

  They cannot pass through the membrane
• What direction do water molecules move during osmosis?

  Both ways through the membrane
• Why do water molecules move randomly?

  Because they are always in motion
• What happens when there are more water molecules on one side of a membrane?

  There is a steady net flow of water
• What does a higher concentration of water molecules indicate?

  More water molecules are present
• What is the effect of osmosis on a sugar solution?

  It becomes more diluted
• How does water act during osmosis?

  It tries to equalize concentrations
• What is the first step in the osmosis experiment with potatoes?

  Cut potatoes into identical cylinders
• What should one potato cylinder be in the osmosis experiment?

  Pure water
• What should the other potato cylinder be in the osmosis experiment?

  Concentrated sugar solution
• What is the purpose of measuring the mass of potato cylinders after osmosis?

  To determine water absorption
• What happens to potato cylinders in concentrated sugar solution?

  They lose mass
• What does the change in mass of potato cylinders indicate?

  Osmosis has occurred
• What is the final step in the osmosis experiment?

  Compare the mass changes
• What does a significant mass change indicate in the osmosis experiment?

  High rate of osmosis
• How can you conclude the effect of sugar concentration on osmosis?

  By comparing mass changes at different concentrations
• What is the relationship between sugar concentration and osmosis?

  Higher concentration leads to more osmosis
• What is the significance of osmosis in plant cells?

  It helps maintain turgor pressure
• How does osmosis affect the overall health of plants?

  It ensures proper hydration and nutrient uptake
• What is the role of osmosis in everyday life?

  It affects food preservation and hydration
• What can be inferred from the osmosis experiment results?

  Osmosis is influenced by solute concentration
• What should you do after taking the cylinders out?

  Dry them with a paper towel
• Why is it important to measure the mass of the cylinders again?

  To determine any changes in mass
• What happens to the mass of cylinders drawn in water by osmosis?

  They will have increased mass
• What happens to the mass of cylinders if water is drawn out?

  They will have decreased mass
• How can you calculate the percentage change in mass?

  By comparing initial and final mass values
• What are the dependent and independent variables in this experiment?

  • Dependent variable: Chip mass
  • Independent variable: Concentration of sugar solution
• What must be kept constant in each case of the experiment?

  All other variables like temperature
• Why is it important to be aware of errors in the experiment?

  To ensure accurate and reliable results
• How does the concentration of sugar solution affect the mass of potato cylinders?

  Higher concentration leads to lower mass
• What is the effect of using different salts in the experiment?

  It may change the mass of potato cylinders
• What does an increase in mass indicate in this experiment?

  Water has entered the potato cells
• What does a negative percentage change in mass indicate?

  Water has left the potato cells