4. The abundance of water in the cells and tissues helps to minimize temperature

Question

4. The abundance of water in the cells and tissues helps to minimize temperature fluctuations. This due to what property of water?

            1. Density

            2. Viscosity

            3. Specific heat

            4. Boiling point

5. Compounds that ionize when dissolved in water are called____.

            1. Electrolytes

            2. Polar compounds

            3. Hydrophobic compounds

            4. Amphipathic compounds

6. Electrolytes dissolve readily in water because

            1. They are held together by electrostatic forces.

            2. They are hydrophobic.

            3. Water molecules can cluster about cations.

            4. Water molecules can cluster about anions.

            5. Water molecules can cluster about and anions.

7. A molecule or ion is said to be hydrated when it______.

            1. Is neutralized by water

            2. Is surrounded by water molecules

            3. Reacts and forms a covalent bond to water

            4. Aggregates with other molecules or ions to form a micelle in water.

9. Solutes diffuse more slowly in cytoplasm than in water because of

            1. The higher viscosity of water.

            2. The higher heat of vaporization of water.

            3. The presence of many crowded molecules in cytoplasm.

            4. The absence of charged molecules inside cells.

10. The ______ pressure is the pressure required to prevent the flow of solvent through a solvent-permeable membrane that separates two solutions of different solute concentration.

            1. Hydrostatic

            2. Electromotive

            3. Osmotic

            4. Partial

11. Which is true about the solubility of electrolytes in water?

            1. They are all insoluble in water

            2. They are usually only sparingly soluble in water

            3. They often form super-saturated aqueous solutions

            4. They readily dissolve and ionize in water

12. The osmotic pressure of an aqueous solution depends on

            1. The chemical nature of the solute

            2. The molar concentration of solute.

            3. The hydrophobic effect of the solute

            4. All of these

            5. None of these

14. Molecules that are both hydrophobic and hydrophilic are _______.

            1. Amphipathic

            2. Amphoteric

            3. Bipolar

            4. Not possible

Explanation / Answer

1) The oxygen in water has sp2 hybrid orbitals.

2) Ammonia

3) Four

4) Specific heat   (high for water)

5) Right answer will be ionic compounds. You can also call them electrolytes

6) Held together by electrostatic force (and water is highly polar)

7) surronded by water molecules (loosley bound water)

9) Absence of charged molcules in cell

10) Osmotic

11) readily dissolve and ionize in water

12) molar concentration (because colligative property)

14) Amphiphilic, so 'not possible' to choose

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