16. The theory of evolution is critical to all areas of biology because it expla

Question

16. The theory of evolution is critical to all areas of biology because it explains: A. why distantly-related organisms sometimes resemble each other B. the diversity of organisms C. why all organisms have characteristics in common D. how organisms become adapted to the environment E. all of the above are true 17. Which one of these hydrocarbons has a double bond in its carbon skeleton? A. C,H B. C2Ht C. CH D. C,H E. CH2 18. Stomach acid has a pH of about 2. How many times greater is the concentration of protons (H ions) in stomach acid than in pure water (pH 7)? A. 5 times B. 500 times E. none of the above C. 7/2 (about 3.5 times) D. 100,000 times

Explanation / Answer

17) C2H2 has a double bond in its carbon skeleton.

CH4 - methane

it has only one carbon atom and four hydrogen atoms per molecule.

C2H6 : ethane

Once the two carbons are linked there are 6 more bonding sites and these are filled by the six hydrogen atoms. Ethane is a saturated molecule.

C3H8 -  propane

The third carbon has to be linked with either of the other two carbons forming a three carbon chain with 8 additional bonding sites, each bonded to a hydrogen atom. Propane is a saturated molecule.

C2H2 : Acetylene (ethyne)

acetylene is unsaturated because it has 2 carbon atoms are bonded together in a triple bond. The c-c triple bond places 4 atoms in the same straight line with CCH bond angles of 180°.

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