Molecules and Compounds

Question 1

Compound

Answer 1

a substance whose
smallest particles include more
than one element chemically
bonded together. For example,
water (H2O) is a compound of
hydrogen and oxygen atoms
bonded together.

Question 2

Mixture

Answer 2

• a substance that
  includes more than one type of
  element and/or compound.

Question 3

Chemical Bond

Answer 3

a bond formed
between atoms through the
sharing or transferring of
electrons.

Question 4

Covalent Bond

Answer 4

a type of
chemical bond formed by shared
electrons.

Question 5

Molecule

Answer 5

a group of atoms held
together by covalent bonds in a
specific ratio and shape.

Question 6

Chemical Formula

Answer 6

identifies the
number and element of each type
of atom in a compound. For
example, the chemical formula
Fe2O3 is for a compound with iron
(Fe) and oxygen (O) in a ratio of 2
iron atoms for every 3 oxygen
atoms.

Question 7

Ion

Answer 7

an atom that has an electric
charge different from zero. Ions
are created when atoms gain or
lose electrons.

Question 8

Ionic Bond

Answer 8

a bond that
transfers an electron from one
atom to another resulting in
attraction between oppositely
charged ions.

Question 9

Valence Electrons

Answer 9

electrons in
the highest unfilled energy level of
an atom. These electrons
participate in chemical bonds.

Question 10

Oxidation Number

Answer 10

indicates
the charge of an atom when an
electron is lost, gained, or shared
in a chemical bond. An oxidation
number of +1 means an electron
is lost, -1 means an electron is
gained.