Question

1. a compound contains hydroxyl groups as its predominant functional group. therefore, this compound

a) should dissolve in a nonpolar solvent
b) should dissolve in water
c) will not form hydrogen bonds with water
d) lacks an asymmetric carbon and is probably a fat or lipid
e) all the above statements are correct.

1. which branch of biology is concerned with the naming and classifying of organisms?

a) biology
b) natural selection
c) ecology
d) evolution
e) none of the other answers is correct

1. the partial negative charge in a molecule of water occurs because

a) one of the hydrogen atoms donates an electron to the oxygen atom
b) the electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen atom nucleus than around the hydrogen atom nucleus
c) the oxygen atom has two pairs of electrons in its valence shell that are not neutralized by hydrogen atoms
d) the oxygen atom donates an electron to each of the hydrogen atoms

1. what results from an equal sharing of electrons between atoms?

a) an ionic bond
b) a hydrogen bond
c) a nonpolar covalent bond
d) a polar covalent bond
e) a hydrophobic interaction

Explanation:

1. Hydroxyl groups are polar and can form hydrogen - bonds with water, making the compound water - soluble. Nonpolar solvents won't dissolve it well. Fats and lipids don't have hydroxyl as the predominant group.
2. Taxonomy is the branch of biology concerned with naming and classifying organisms. None of the given options are correct.
3. In a water molecule, oxygen is more electronegative than hydrogen. So the shared electrons spend more time around the oxygen atom nucleus, creating a partial negative charge on oxygen.
4. An equal sharing of electrons between atoms results in a nonpolar covalent bond. Ionic bonds involve electron transfer, hydrogen bonds are between molecules, polar covalent bonds have unequal electron - sharing, and hydrophobic interactions are non - polar interactions.

Answer:

1. B. should dissolve in water
2. E. none of the other answers is correct
3. B. the electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen atom nucleus than around the hydrogen atom nucleus
4. C. a nonpolar covalent bond