Will ! a cell containing a 3% sucrose solution is placed into a beaker containing a 7% sucrose solution. assume the cell’s membrane is permeable to water, but not permeable to the sucrose. where will the water diffuse? explain.

A cell containing a 3% sucrose solution is placed into a beaker containing a 7% sucrose solution. Assume the cell's membrane is permeable to water, but not permeable to the sucrose.

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The water will diffuse from the 3 % sucrose solution to the 7 % sucrose solution until the two solutions are isotonic.

Explanation:

One definition of osmosis is that it is the movement water molecules from a region of higher water potential to a region of lower  water potential through a partially permeable membrane. Water potential can be though of as the ability of molecules to move freely. They move more freely in 3 % sucrose solution because there are fewer solute particles. So water will diffuse from the 3 % sucrose solution to the 7 % sucrose solution until the two solutions are isotonic.

1. If the switch is closed, the total resistance of the circuit remains the same

2. The brightness of the bulb A when the switch is closed remains the same.

Explanation:

An ideal battery has no internal resistance, and hence, maintains a constant value of voltage without diminishing. The total resistance of the circuit will remain constant since this is an inherent unchanging property of a conducting circuit provided there is no change to its configurations. The brightness of the bulb A will remain unchanged since we are considering an ideal battery. In practice, ideal batteries don't exist, reason why battery powered light bulbs gradually dim with time as the internal resistance increases, till it eventually dies.