A group of engineers has just conducted an experimental trial on a shoe designed to help people suffering from a painful foot disorder. During the trial, the shoe proved effective for only 5% of the test subjects. What should the engineers do next?

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.

air

in a tire you fill a tire with air

then a couple days later you check the air pressure in the tire

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