1. © Copyright Pearson Prentice Hall Molecular Compounds > Slide 1 of 18 With the other person at your table, make these two lists. What are the reasons, bonds, that hold a new couple together? 1. 2. 3. 4. What are the reasons, bonds, that hold your family together? 1. 2. 3. 4.

2. © Copyright Pearson Prentice Hall Molecular Compounds > Slide 2 of 18 Molecules and Molecular Compounds II. MOLECULAR COMPOUNDS A. Molecules: neutral group of atoms joined together by covalent bonds. 1. covalent bond: atoms held together by shared electron(s) 2. monatomic: exist as single atoms (not molecular) 3. diatomic: molecule consisting of two atoms. 8.1

3. © Copyright Pearson Prentice Hall Molecular Compounds > Slide 3 of 18 Molecules and Molecular Compounds 4. molecular compound: A compound composed of molecules (covalent bonded), like: a. Tend to have low melting & boiling points. b. Tend to be made of non-metals 8.1

4. © Copyright Pearson Prentice Hall Molecular Compounds > Slide 4 of 18 Molecular Formulas 8.1 5. molecular formula: chemical formula of a molecular compound. a. shows how many atoms of each element a molecule contains. (examples)

5. © Copyright Pearson Prentice Hall Molecular Compounds > Slide 5 of 18 Molecular Formulas 8.1 b. Other methods or representing a molecule (draw each)

6. © Copyright Pearson Prentice Hall Slide 6 of 18 1.Compared to ionic compounds, molecular compounds tend to have relatively a.low melting points and high boiling points. b.low melting points and low boiling points. c.high melting points and high boiling points. d.high melting points and low boiling points. 8.1 Section Quiz.

7. © Copyright Pearson Prentice Hall Slide 7 of 18 2.A molecular compound usually consists of a.two metal atoms and a nonmetal atom. b.two nonmetal atoms and a metal atom. c.two or more metal atoms. d.two or more nonmetal atoms. 8.1 Section Quiz

8. © Copyright Pearson Prentice Hall Slide 8 of 18 8.1 Section Quiz 3.A molecular formula shows a.how many atoms of each element a molecule contains. b.a molecule's structure. c.which atoms are bonded together. d.how atoms are arranged in space.

9. © Copyright Pearson Prentice Hall Slide 9 of 18 109 Physical Science P.12.A.7 http://www.rpdp.net/sciencetips_v2/P12A7.htm http://www.rpdp.net/sciencetips_v2/P12A7.htm According to the Law of Conservation of Mass, the number of iron (Fe) atoms needed to complete the following reaction is ____. ___Fe + 3O 2  2 Fe 2 O 3 A. 1 B. 2 C. 3 D. 4 (Is Iron III Oxide a molecular compound?)