A civil engineer chooses to use wooden beams because they will sag before they break. This is an example of:
A. using a material for multiple applications.
B. choosing a material that will show warning before it fails.
C. using composite materials that combine strengths.
D. using design techniques that increase efficiency and reduce
costs.

B. choosing a material that will show warning before it fails.

Explanation:

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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.