1. Chemistry 8.1

2. Molecules and Molecular Compounds
8.1
Molecules and Molecular Compounds
A molecule: atoms joined together by covalent bonds (shared). Neutral.
A diatomic molecule: a molecule consisting of two atoms. Rule of 7’s.

3. Molecules and Molecular Changes
8.1
Molecules and Molecular Changes
Molecular compounds tend to have relatively lower melting and boiling points than ionic compounds.

4. A molecular formula is the chemical formula of a molecular compound.
8.1
Molecular Formulas
A molecular formula is the chemical formula of a molecular compound.
shows how many atoms of each element and types of elements

5. 8.1
Molecular Formulas
Ammonia (NH3) is used in solution as a cleaning agent. You can represent the ammonia molecule by its molecular formula, its structural formula, a space-filling molecular model, a perspective drawing, or by a ball-and stick molecular model.

6. 8.1 Formulas of Some Molecular Compounds Molecular Formulas
The formula of a molecular compound indicates the numbers and kinds of atoms. The arrangement of the atoms within a molecule is called its molecular structure. Using Models Which of these molecules has the greatest number of oxygen atoms?

7. 8.1 Section Quiz.
8.1.

8. 8.1 Section Quiz.
1. Compared to ionic compounds, molecular compounds tend to have relatively
low melting points and high boiling points.
low melting points and low boiling points.
high melting points and high boiling points.
high melting points and low boiling points.

9. 8.1 Section Quiz
2. A molecular compound usually consists of
two metal atoms and a nonmetal atom.
two nonmetal atoms and a metal atom.
two or more metal atoms.
two or more nonmetal atoms.

10. 8.1 Section Quiz
3. A molecular formula shows
how many atoms of each element a molecule contains.
a molecule's structure.
which atoms are bonded together.
how atoms are arranged in space.

11. END OF SHOW