#39 The melting point of a compound is 1240 degrees C. Is thisCompound most likely an ionic or molecular compound?

Answer: IONIC; It has a very HIGH melting point that is characteristicOf 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.

#40 Identify the number and kinds of atoms present in aMolecule of each compound:

a. C6H8O6 Has 6 carbons, 8 hydrogen's, and 6 oxygen's.

B. C12H22O11 Has twelve carbons, twenty two hydrogens, andEleven oxygens

C. C7H5N3O6 has seven carbons, five hydrogens, three nitrogensAnd six oxygens

41. Which of the following gases in Earth’s atmosphere Would you expect to find as molecules and which asIndividual atoms? Explain.

a. 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 itselfSo you would expect it to be individual atoms.

#42 Explain why neon is monatomic but chlorine is diatomic.

Neon is monatomic (means one atom) because it is a noble gasAnd doesn’t bond with anything.

Chlorine is diatomic (meaning two atoms) Cl2 becauseEach chlorine needs one electron to fill its outer valence shellIt does so by sharing one electron with another chlorine.

#43 Classify the following compounds as ionic or covalent

Non-polar (totally equal sharing) Ionic (totalTransfer)

#43 Classify the following compounds as ionic or covalent

Non-polar (totally equal sharing) Ionic (totalTransfer)

#44 Describe the difference between an ionic and a covalent bond?

#45 How many electrons do two atoms in a double bondCovalent bond share? How many in a triple covalent bond?

Double bondShares four

triple bondShares six

#46 Write plausible electron dot structures for the followingSubstances. Each substance contains only single covalent bonds.

I2

NI3

OF2

H2S

#47 Characterize a coordinate covalent bond andGive an example:

A coordinate covalent bond occurs when one atom Supplies both of the electrons in the bond. In this exampleNitrogen supplies both electrons to the hydrogen that comesin to bond.

In this example fluorineBrings in both electronsTo bond with Boron.

#48 Explain why compounds containing C – N and C – O single bonds can form coordinate covalent bondsWith H+ but compounds containing only C – H and C – C single bonds cannot.

In the case of C – N bonds andC – O bonds, an unshared pairOf electrons can exist to allowAnother atom to bond withoutBringing in two of its own.C – H and C – C bonds don’t Usually have unshared pairs toBond with.

#49 Using electron dot structures, draw at least two Resonance structures for the nitrite ion (NO2

1-)