17. give the electron configuration for the sulfide ion. what else has this configuration? when submitting your answer use a caret (^) to indicate the number of electrons in each sublevel. (for example, 1s2 would be written as 1s^2) (2 points) *
your answer
18. how does the electron dot structure for co illustrate the octet rule? (2 points) include the electron dot structure for co (1 point) and include the definition of the octet rule in your explanation. (2 points) (5 points total) *
your answer
19. explain why metals are good conductors of electricity (2 points). include the definition of metallic bonds (2 points). (4 points total) *
your answer
20. what is a resonance dot structure? (2 points) how do you know if you have resonance? (1 point) (3 points total) *
your answer
21. why is the melting point of a network solid so high? (1 point) how is this related to what a network solid is? (2 points) (3 points total) *

The last few miles of the marathon are the most difficult for heather, her hair plastered to her head, sweat clinging to her arms, and her legs already feeling as if they had nothing left, just dead weight. after grabbing a cup of ice water, she feels the ice cubes smash against her nose as she gulps some cool refreshment and keeps on running. in these last few miles, the breeze kicks up and she finally feels some coolness against her skin. drips of sweat, once clinging to her forehead, now spill down, and heather feels more pain as the sweat flows into her eyes. which of the following is the most likely reason why the ice struck heather’s nose when she took a drink? a) water can function as a solvent. b) water can store large amounts of heat. c) water can moderate temperatures through evaporative cooling. d) the density of water decreases when it freezes. e) water has a cohesive nature. sweat remained on heather’s forehead and arms because of the a) high salt content of sweat b) cohesive nature of water c) ability of water to moderate heat d) high evaporative cooling effect of water e) ability of water to act as a solvent