a) ionic molecules
b)molecules made mostly of c-c and c-h bonds
c) molecules containing lots of o-h bonds
2006-10-17 16:07:48 · 6 answers · asked by Anonymous in Science & Mathematics ➔ Biology
B
2006-10-17 16:10:38 · answer #1 · answered by Anonymous · 4⤊ 0⤋
Both a and c are polar molecules that is they experience dipole moments. Since water is a polar solvent and the rule of thumb is like dissolves like water would dissolve these. C-C and C-H bonds are nonpolar and dont experience dipole moments therefore they would be insoluble in water.
The hydrogen( partial +) of the water molecule would be attracted to the free pair of electrons on the O in the O-H bonds and to the partial negative charge on an ionic bond. C-C and C-H do not have a free pair of electrons nor experience a dipole moment long enough to allow a bond with water to be formed.
2006-10-17 23:14:23 · answer #2 · answered by jdaddy76 2 · 0⤊ 0⤋
Everything dissolves a bit in the "universal solvent". But molecules made mostly of C-C and C-H bonds are hydrocarbons, and generally that makes for poor water solubility.
Examples of hydrocarbons are propane, gasoline, kerosene and paraffin wax. Paraffin wax comes pretty close to not dissolving in water at all.
Ionic compounds are often salts of one sort or another and the sea is full of salts in solution.
Molecules containing lots of OH bonds are often used for detergents because of their solubilty in both oil and water.
On the other hand, keep in mind that general guidelines are not hard-and-fast Laws:
Silver chloride is ionic, but very poorly soluble in water and there are other ionic compounds much less soluble. Methane, a molecule of C and H only, is about twice as soluble as silver chloride.
Cellulose is a polysaccharide that's got lots and lots of OH bonds, but has almost no solubility in water. Think of washing a pair of cotton socks until they dissolved!
2006-10-18 00:00:34 · answer #3 · answered by end_or_phin 2 · 0⤊ 0⤋
B
Because molecules made mostly of C-C bonds or C-H bonds are most likely non-polar and since water molecules are polar, non-polar substances don't dissolve in it. Remember: Oil and Vinegar don't mix, Oil and Water don't mix but Water and Vinegar mix (because oil is non-polar and both vinegar and water are polar). For the same reason, you can't get rid of an oil stain just by rinsing it under the water.
2006-10-17 23:27:35 · answer #4 · answered by smarties 6 · 0⤊ 0⤋
molecules with c-c and c-h bonds will not be polar. Non polar compounds will not dissolve in water. So b) is the answer.
2006-10-18 00:42:42 · answer #5 · answered by Dr. J. 6 · 0⤊ 0⤋
b)molecules made mostly of c-c and c-h bonds
2006-10-17 23:10:02 · answer #6 · answered by DanE 7 · 1⤊ 1⤋