Compounds, Chemical Formulas, and Covalent Bonds

Sharing

Atoms can bond to form compounds by BLANK valence electrons.

Molecular Models

BLANK show the shape and appearance of the arrangement of atoms in a compound.

Oxygen Atom

Because the electrons have a slight negative charge, there is a slight negative charge near the BLANK BLANK atom.

Covalent Compounds

Blank generally have low melting points and low boiling points.

Properties

Compounds and the elements that form them often have very different chemical and physical BLANK

Elements

Compounds are chemical combinations of two or more BLANK

poor

Covalent compounds are BLANK conductors of electricity.

Nonpolar

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

Dissolve

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

Covalent Bond

A BLANK is a chemical bond formed when two or more atoms share one or more pairs of valence electrons.

molecules

A BLANK is a group of atoms held together by covalent bonding that acts as an independent unit.

Chemical Formula

A BLANK is a group of chemical symbols and numbers that represent the elements and the numbers of atoms of each element in a compound.

Triple

In a BLANK covalent bond, three pairs of valence electrons are shared between two atoms.

Two (2)

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

Strongly

In a covalent bond, one atom can attract the shared electrons more (BLANK) than the other atom can.

Single

In a hydrogen molecule, a BLANK covalent bond forms when each atom shares it valence electrons with the other.

Oxygen

In a molecule of water, the BLANK atom attracts the electrons more strongly than each hydrogen atom does.

letters

The BLANK in a chemical formula represent elements.

Postive

There is a slight BLANK charge near the hydrogen atoms.

Stronger

Triple covalent bonds are BLANK than double covalent bonds, which are stronger than single bonds.

Shared

When forming water, valence electrons are BLANK between oxygen and hydrogen atoms, thereby forming covalent bonds to make three stable atoms.