1
Q
Which four elements make up approximately 96% of all living matter?
A
Carbon, hydrogen, nitrogen, and oxygen
2
Q
A covalent chemical bond is one in which
A
Outer-shell electrons of two atoms are shared so as to satisfactory fill the outer electron shells of both atoms
3
Q
What term explains most specifically the attraction of water molecules to one another
A
Hydrogen bond
4
Q
In the term trace element, the modifier trace means
A
The element is required in very small amounts
5
Q
The reactivity of an atom arises from
A
The existence of unpaired electrons in the valance electrons
6
Q
The ionic bond of sodium chloride is formed when
A
Chlorine gains an electron from sodium
Biology 111
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