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3 years ago

13

Describe how phospholipids form a barrier between water inside the cell and water outside the cell

1 answer:

Lynna [10]3 years ago

6 0

<span>Phospholipids would have to form a phospholipid bilayer in order to achieve water on the outside and water inside. This is because the nonpolar tails of the phospholipids are facing each other in a water environment because they cannot interact with the water, only their own tails, while the phosphate heads of the molecule face the periphery of the tails and interact with water. Micelles are the simplest examples of these.</span>

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The mathematical expression for the depression in freezing point is given as:

$\Delta T_{f}= k_{f}m$

where, $\Delta T_{f}$ = depression in freezing point

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given mass of biphenyl solute = 0.925 g

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number of moles of biphenyl = $\frac{0.925 g}{154.21 g/mol}$

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Convert g into kg: 1 kg = 1000 g

Thus, mass of cyclohexane = $\frac{25.0}{1000}$

= 0.025 kg

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Molality = $\frac{0.0059 mole}{0.025 kg}$

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$T_{solution} = 6.50^{o}C- 4.72 ^{o}C$

= $1.78^{o}C$

Hence, freezing point of the solution is $1.78^{o}C$ .

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