BIO Unit II SG pt 2

Q12 Which type of change affects the appearance but not the chemical makeup of a substance? It is generally reversible.

• physical change
• chemical change

Q12 Which type of change involves energy from the reactions that occur between the atoms?

• physical change
• chemical change

Q12 When baking soda reacts with vinegar and bubbles of carbon dioxide gas is released, what kind of change has occurred?

• physical change

• chemical change

Q12 If water freezes into ice, what kind of change has occurred?

• physical change
• chemical change

Q13 What is the difference between a solute and a solvent?

• The solute dissolves the solvent.
• The solute reacts and chemically combines with the solvent.
• The solute is dissolved by the solvent.

Q14 What is diffusion?

• The net movement of molecules from an area of low concentration to high concentration.
• The net movement of molecules from an area of high concentration to low concentration.

Q15 In what direction does diffusion occur?

• up its concentration gradient
• down its concentration gradient

Q15 What is the concentration gradient?

• the difference in number of molecules from one area and another
• the difference in water levels from one area to another

Q16 What is the difference between permeable and semi-permeable membranes?

• Permeable membranes don't allow any molecules through, while semi-permeable membrane allow all molecules through

• Permeable membranes allow all molecules through, while semi-permeable membrane don't allow any molecules through

• Permeable membranes allow all molecules through, while semi-permeable membrane allow some molecules through

Q17 Which of the following is NOT a main difference between diffusion and osmosis?

• Diffusion can occur in air or liquids.

• Osmosis refers to the diffusion of water molecules only.

• Diffusion can occur through permeable membranes.

• Osmosis can only occur through semi-permeable membranes.

• Diffusion only moves up its concentration gradient.