Quiz 2: Properties of Compounds

If an atom has twelve electrons, how many electrons are in the n=1 energy level? How many electrons are in the n=2 energy level? How many electrons are in the n=3 energy level? Answer in the form: n=1 shell __, n=2 shell __, n=3 shell __

n=1 shell 2, n=2 shell 8, n=3 shell 2

A salt is produced when an acid reacts with a base.

t

An atom that has gained or lost electrons is called an ion.

t

The symbol Na + represents a sodium atom that has lost an electron.

t

Water is an example of a compound.

t

Of the known elements only about ten are needed by living things.

f

Sodium and chlorine atoms combine readily because they both tend to lose electrons.

f

The number of protons within an atom of an element is equal to its atomic mass.

f

Water can dissolve only inorganic compounds.

f

Atoms that form compounds are held together by chemical bonds. The bond that includes sharing electrons with another atom is called _____ A. covalent B. hydrogen C. ionic

A

When an atom gains an electron, it becomes _____ charged. A. negatively B. positively

A

Choose the three types of bonds introduced. A. ionic B. molecular C. compound D. covalent E. hydrogen F. oxygen

A, D, and E

A substance which yields an anion plus a proton is a(n): A. salt B. acid C. base

B

If the outer energy level of the atom is full, it ________ react readily with other atoms. A. does B. does not

B

When an atom loses an electron, it becomes _____ charged A. negatively B. positively

B

Atoms which transfer electrons can combine to form a(n) _____ bond. A. covalent B. hydrogen C. ionic

C

Chemical reactions are the result of an atom attempting _____. A. to reduce the number of electrons B. to become electrically neutral C. to rearrange its configuration to result in a stable octet D. add sufficient electrons to complete its outer shell

C

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.

f

If an atom loses or gains an electron, it is called a(n) _____

ion

A solution that contains equal numbers of hydrogen and hydroxide ions would be called:

neutral