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Biology µIB
2.2 Water
10 quick questions

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Essential Idea: Water is the medium of life.

10 minutes maximum! (can you do it in 5?)

water droplets

 

1. A water molecule is formed of ...

  • A. ionic bonds between a hydrogen and an oxygen atom
  • B. covalent bonds between a hydrogen and an oxygen atom
  • C. ionic bonds between two hydrogen atoms and one oxygen atom
  • D. covalent bonds between two hydrogen atoms and one oxygen atom

2. The nucleus of the oxygen atom is more attractive to electrons than the nucleus of the hydrogen atom. There is unequal sharing of electrons. This causes which of the following?

  Hydrogen Oxygen
A. Partial negative charge Partial positive charge
B. Partial positive charge Partial negative charge
C. Partial negative charge Partial negative charge
D. Partial positive charge Partial positive charge

3. Substances which dissolve in water are known as ...

  • A. hydrophobic
  • B. insoluble
  • C. hydrophilic
  • D. hydrolysing

4. Which of the following is a hydrophobic molecule?

  • A. Trigylceride
  • B. Glucose
  • C. Ribose
  • D. DNA

5. Water is most dense at ...

  • A. 0oC
  • B. 100oC
  • C. -50oC
  • D. 4oC ¬†

Q6-10: These questions are about the properties of water.

 

6. The transport of water up the xylem in plants depends on which property of water?

  • A. Cohesion
  • B.¬†Solvent
  • C. Density
  • D. Thermal

7. Cohesion depends on:

  • A. The hydrogen bonding between hydrogen and oxygen in the same water molecule
  • B. Hydrogen bonding between two hydrogen atoms
  • C. The hydrogen bonding between hydrogen and oxygen in a different water molecule
  • D. The polar forces between water and the surface.

8. The high specific heat capacity of water enables large expanses of water, e.g. a lake, to ...

  • A. lose heat quickly
  • B. heat up quickly
  • C. change temperature rapidly
  • D. maintain a relatively stable temperature

9. Water is a good evaporative coolant, e.g. sweating, and cooling leaves.
This is because it has a ...

  • A. high specific heat capacity
  • B. high latent heat of vapourisation
  • C. high boiling point
  • D. low boiling point

10. Water is often called a universal solvent, but why is this statement incorrect?

  • A. Water dissolves more chemicals than any other solvent
  • B. Water dissolves and transports polar molecules
  • C. Water does not dissolve organic compounds such as lipids
  • D. Water is a good medium for the transport of nutrients