compounds, chemical formulas, and covalent bonds les 2

covalent bond

a(n) ...... is a chemical bond formed when two or more atoms share one or more pairs of valence electrons

two

in a carbon dioxide molecule, a double covalent bond forms when the carbon atom shares .... pairs of valence electrons with each oxygen atom

single

in a hydrogen molecule, a(n) .... covalent bond forms when each atom shares its valence electrons with the other.

triple

in a(n) ..... covalent bond, three pairs of valence electrons are shared between two atoms

covalent compounds, poor

..... generally have low melting points and low boiling points. They are ..... conductors of electricity.

polar molecule

a molecule that has a slight positive end and a slight negative end because of unequal sharing of electrons is a(n) .......

molecule

a(n) ..... is a group of atoms held together by covalent bonding that acts as an independent unit

chemical formula

a(n) ..... is a group of chemical symbols and numbers that represent the elements and the numbers of atoms of each element in a compound

properties

compounds and the elements that form them often have very different chemical and physical....

elements

compounds are chemical combinations of two or more....

nonpolar

molecules made up of atoms of the same element are ....... because the atoms are identical. So, they share electrons equally.

dissolve

polar molecules, such as sugar and water, ...... easily in one another because of the attraction of opposite charges