Quiz #2 (Ch 3-4)

The partial negative charge in a molecule of water occurs because ________.

the electrons shared between the oxygen and hydrogen atoms spend more time around the oxygen atom nucleus than around the hydrogen atom nucleus

Organic chemistry is currently defined as

the study of carbon compounds.

Most organic compounds contain which atoms?

carbon, hydrogen, oxygen, nitrogen (CHON) *Carbon, hydrogen, oxygen, and nitrogen are the four main atoms comprising organic molecules.

Which of the following effects can occur because of the high surface tension of water?

A raft spider can walk across the surface of a small pond.

Which of the following unique feature of carbon allows it to support life on Earth?

Carbon can form a variety of bonds in nature.

Variation in carbon chains is an important source of molecular complexity. How can carbon skeletons vary?

Carbon skeletons can vary in length, exhibit different branching structures, contain double bonds at different positions, and contain rings of carbon atoms

Which answer best describes why does ice float in liquid water?

Stable hydrogen bonds keep water molecules of ice farther apart than water molecules of liquid water. Submit

How are the hydrogen bonds formed between water molecules?

by the attraction between the positive end of one water molecule with the negative end of the other

Because organisms are made primarily of water, they resist rapid temperature changes. This useful quality is based on water's __________.

high specific heat *Water has a high specific heat, meaning that a relatively large amount of heat must be added or removed in order to get the temperature to change significantly.

Which of the following functional groups is hydrophobic in nature?

methyl