1. Answer: IONIC; It has a very HIGH melting point that is characteristic
#39 The melting point of a compound is 1240 degrees C. Is this
Compound most likely an ionic or molecular compound?
Answer: IONIC; It has a very HIGH melting point that is characteristic
Of ionic compounds. Think of Table salt as an example. It
Melts at very high temperatures.
Molecular compounds are easy to melt. Think of butter for
Example.

2. #40 Identify the number and kinds of atoms present in a
Molecule of each compound:
a. C6H8O6 Has 6 carbons, 8 hydrogen's, and 6 oxygen's.
C12H22O11 Has twelve carbons, twenty two hydrogens, and
Eleven oxygens
C7H5N3O6 has seven carbons, five hydrogens, three nitrogens
And six oxygens

3. 41. Which of the following gases in Earth’s atmosphere
Would you expect to find as molecules and which as
Individual atoms? Explain.
Nitrogen Nitrogen would be found as N2 with a triple
Covalent bond.
b. Oxygen Oxygen would be founds a O2 with a double
Covalent bond.
c. Argon Argon never bonds with anything including itself
So you would expect it to be individual atoms.

4. #42 Explain why neon is monatomic but chlorine is diatomic.
Neon is monatomic (means one atom) because it is a noble gas
And doesn’t bond with anything.
Chlorine is diatomic (meaning two atoms) Cl2 because
Each chlorine needs one electron to fill its outer valence shell
It does so by sharing one electron with another chlorine.

5. 1.0 .4 2.0 NON-POLAR VERY POLAR IONIC SLIGHTLY POLAR IONIC COVALENT
#43 Classify the following compounds as ionic or covalent
Non-polar (totally equal sharing)
Ionic (total
Transfer)
1.0 .4
2.0
NON-POLAR
VERY POLAR
IONIC
SLIGHTLY POLAR
IONIC
COVALENT

6. H - O H - S Mg - Cl 1.0 2.0 .4 Na - S NON-POLAR VERY POLAR IONIC
#43 Classify the following compounds as ionic or covalent
Non-polar (totally equal sharing)
Ionic (total
Transfer)
H - O
H - S
Mg - Cl
1.0
2.0 .4
Na - S
NON-POLAR
VERY POLAR
IONIC
SLIGHTLY POLAR
IONIC
COVALENT

7. IONIC is a transfer of electrons
#44 Describe the difference between an ionic and a covalent bond?
IONIC is a transfer of electrons
Covalent is a sharing of electrons

8. #45 How many electrons do two atoms in a double bond
Covalent bond share? How many in a triple covalent bond?
Double bond
Shares four
triple bond
Shares six

9. #46 Write plausible electron dot structures for the following
Substances. Each substance contains only single covalent bonds. I2
OF2
H2S
NI3

10. #47 Characterize a coordinate covalent bond and
Give an example:
A coordinate covalent bond occurs when one atom
Supplies both of the electrons in the bond. In this example
Nitrogen supplies both electrons to the hydrogen that comes
in to bond.
In this example fluorine
Brings in both electrons
To bond with Boron.

11. #48 Explain why compounds containing C – N and
C – O single bonds can form coordinate covalent bonds
With H+ but compounds containing only C – H and
C – C single bonds cannot.
In the case of C – N bonds and
C – O bonds, an unshared pair
Of electrons can exist to allow
Another atom to bond without
Bringing in two of its own.
C – H and C – C bonds don’t
Usually have unshared pairs to
Bond with.

12. #49 Using electron dot structures, draw at least two
Resonance structures for the nitrite ion (NO21-)