8.1 molecules and molecular compounds how are the melting points and boiling points of molecular...

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8. 1 Molecules and Molecular Compounds Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

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Page 1: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

8.1 Molecules and Molecular Compounds

Molecules and Molecular Compounds

How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Page 2: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecules and Molecular Compounds

In nature, matter takes many forms. The noble gases, including helium and neon, are monatomic. That means they exist as single atoms.

8.1

Page 3: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecules and Molecular Compounds

Some compounds are so different from ionic compounds that attractions between ions fail to explain their bonding.

The atoms held together by sharing electrons are joined by a covalent bond.

8.1

Page 4: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecules and Molecular Compounds

A molecule is a neutral group of atoms joined together by covalent bonds. Air contains oxygen molecules.

A diatomic molecule is a molecule consisting of two atoms. An oxygen molecule is a diatomic molecule.

8.1

Page 5: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecules and Molecular Compounds

A compound composed of molecules is called a molecular compound. Water and carbon monoxide are molecular compounds.

8.1

Page 6: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecules and Molecular Changes

Molecular compounds tend to have relatively lower melting and boiling points than ionic compounds.

8.1

Page 7: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecules and Molecular Compounds8.1

Page 8: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecules and Molecular Changes8.1

Ethane, a component of natural gas, is also a molecular compound.

Page 9: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecular Formulas

Molecular Formulas

What information does a molecular formula provide?

8.1

Page 10: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecular Formulas8.1

A molecular formula is the chemical formula of a molecular compound.

A molecular formula shows how many atoms of each element a molecule contains.

Page 11: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecular Formulas8.1

Page 12: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

Molecular Formulas

Formulas of Some Molecular Compounds

8.1

Page 13: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

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.

Page 14: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

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

Page 15: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

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.

Page 16: 8.1 Molecules and Molecular Compounds How are the melting points and boiling points of molecular compounds different from those of ionic compounds?

END OF SHOW

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