Use the periodic table to explore the electro negativities from period 3 and group 17. Fill in the missing values in the table so you can compare the electronegativities of the elements. After the table is filled in, compare the values in each column.

A=3.16
B=1.31
C=0.93

c- cold periods in earth's history during which glaciers covered much of the surface.

explanation:

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

a). in this case, dh> 0 and sd> 0. if t becomes larger, the term "-tds" will become more negative. at some point, it is possible that -dts will be more negative than the dh is positive, and the reaction will become spontaneous. this is probably the correct answer, but you should look at all of the other possibilities and make sure of that.