10 questions in 10 minutes

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. Capillary action in plant cell walls and the movement of water through soil is explained by which property?

  • A. Cohesion
  • B. Boyancy
  • C. Adhesion
  • D. Thermal conductivity

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

  • A. Cohesion
  • B. Solvent
  • C. Density
  • D. Thermal conductivity

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 black-throated loon (Gavia arctica) spends much of its time flying but can also swim underwater and dive to catch fish. Solid bones, compression of air in its feathers and in the lungs are necessary because..

I. Water produces more buoyancy than air
II. Water is less viscous than air
III. Water is a better thermal conductor than air
 
  • A. I only
  • B. I and II only
  • C. II and III only
  • D. I, II and III

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

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

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