Biology - Quiz 2: Properties of Compounds
The symbol Na + represents a sodium atom that has lost an electron.
true
Chemical reactions are the result of an atom attempting _____.
to rearrange its configuration to result in a stable octet
An atom that has gained or lost electrons is called an ion.
true
Water is an example of a compound.
true
Which substance, when dissolved in water, will produce a hydrogen ion plus an anion?
an acid
If the outer energy level of the atom is full, it ________ react readily with other atoms.
does not
The reactivity of an atom is due to the number and arrangement of _________ in the outer energy level.
electrons
A substance that releases hydrogen ions in water is a base.
false
Of the known elements only about ten are needed by living things.
false
Sodium and chlorine atoms combine readily because they both tend to lose electrons.
false
The number of protons within an atom of an element is equal to its atomic mass.
false
Water can dissolve only inorganic compounds.
false
When a salt dissolves in water, it produces either a hydrogen ion or a hydroxyl ion.
false
(Select all that apply.) Choose the three types of bonds introduced.
ionic covalent hydrogen
When an atom gains an electron, it becomes _________ charged.
negatively
A solution that contains equal numbers of hydrogen and hydroxide ions would be called:
neutral
When an atom loses an electron, it becomes __________ charged.
positively
Atoms that form compounds are held together by chemical bonds. The bond that includes sharing electrons with another atom is called ________.
covalent
If an atom loses or gains an electron, it is called a(n) _________.
ion
Atoms which transfer electrons can combine to form a(n) _________ bond.
ionic