Biol 1010 chpt 2 review test

The atomic mass of an atom depends primarily on the number of:
A. protons and neutrons
B. neutrons and electrons
C. positrons
D. protons and electrons

The most abundant element by eight in the human body is:

A. nitrogen
B. hydrogen
C. oxygen
D. carbon

This rule staqtes that the outer electron shell is most stable when it contains eight electrons.

A. atomic rule
B. shell rule
C. octet rule
D. stability rule

How many more electrons does nitrogen require to fill its outer shell?
A. 0
B. 2.
C. 3
D. 4.

A substance with a radioactive tag attached that allows a researcher to tract it in a living system is called a
A. tracer
B. positron
C. neutron
D. noble gas

Which type of chemical bond is formed when atoms share electrons?

A. covalent
B. hydrogen
C. nitrogen
D. ionic

A covalen bond in which electrons are not shared equally is called:

A. neutral
B. nonpolar
C. polar
D. normal

Water flows freely, but does not separate into individual moecules because water is:

A. hydrophobic
B. cohesive
C. hydrophilic
D. adhesive.

Compounds having an affinity for water are said to be

A. adhesive
B. hydrophobic
C. cohesive
D. hydrophilic

Water freezes from the top down because:

A. ice is less cohesive than water.
B. water has a high surface tension
C. ice is less dense than water
D. ice has a high heat capacity

Water can absorb a large amount of heat without much change in temperature because it has a high

A. surface tension
B. heat capacity
C. hydroixed ion (OH -) concentration
D. hydrogen ion (H+) concentration