REVIEW & REHEARSE 2 CHEMISTRY

!ques! <i>Check Your Knowledge</i>

Question 2.17

The atomic number of carbon is 6. Its nucleus must contain:

  • a) 6 neutrons and 6 protons.
  • b) 3 protons and 3 neutrons.
  • c) 6 neutrons and no electrons.
  • d) 6 protons and no electrons.
  • e) 6 protons and 6 electrons.

Question 2.18

The second orbital shell of an atom can hold ____ electrons.

  • a) 2
  • b) 3
  • c) 4
  • d) 6
  • e) 8

Question 2.19

A covalent bond is formed when:

  • a) two nonpolar molecules associate with each other in a polar environment.
  • b) a positively charged particle is attracted to a negatively charged particle.
  • c) one atom gives up electrons to another atom.
  • d) two atoms share electrons.
  • e) two polar molecules associate with each other in a nonpolar environment.

Question 2.20

Which of the following phenomena is most likely due to the high cohesiveness of water?

  • a) Lakes and rivers freeze from the top down, not the bottom up.
  • b) The fishing spider can walk across the surface of liquid water.
  • c) Adding salt to snow makes it melt.
  • d) The temperature of Santa Monica Bay, off the coast of Los Angeles, fluctuates less than the air temperature throughout the year.
  • e) All of the above are due to the cohesiveness of water.