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Why is NBr3 a non-polar molecule?
If the difference in electronegativity is greater than 0.3 than it is Polar. Nitrogen and Bromine the difference is less than .3 so it is nonpolar
Molecules that do not have oppositely charged ends are what molecules?
Molecules that do not have oppositely charged ends are nonpolar molecules.
Why does salt or sugar does not dissolve in kerosene?
Kerosene is a mixture of different hydrocarbon molecules, which are non-polar: they share their electrons equally throughout the molecule, and all electrons in the molecule are involved in bonding. Salt and sugar are polar (attractive, like a magnet) substances. In the case of table salt, it is an ionic compound (NaCl), and each of these atoms has an electric charge from too many or too few electrons. Sugar has oxygen atoms in its molecular structure, and these atoms have four electrons that are not involved in bonding. Although the molecule is overall neutral, these electrons serve as a kind of polar source.Polar liquids will dissolve polar solids, and non-polar liquids will dissolve non-polar solids. However, non-polar substances will not dissolve polar substances, and vice versa. It's like oil and water: the non-polar oil will not mix with the polar water. Another good way to think about it is magnets. The magnet, with a positive pole and a negative pole, will only cling to certain things, like your fridge. The magnet and fridge serve as polar things, whereas a piece of glass, which a magnet will not cling to, serves as a non-polar thing.
Does salt dissolve in vegetable oil?
Salt cannot dissolve in oil. This is because salt is a non-polar substance, because it's bonds are non-polar (this is not to say though that polar bonds always means its a polar substance, but that's another issue). Oil is a polar substance (meaning one end of its molecule is has a slight negative charge, the other a slightly positive charge. It is known that LIKE dissolves LIKE. (e.g. Polar dissovles Polar). There are VERY few exceptions to this.
How do you identify polar or nonpolar?
Any molecule that has a charge, negative or positive, is considered polar. in covalent bonds, polarity happens by one atom not sharing the electrons equally, so the atoms recieve a charge. Any molecule that contains an oxygen along with a hydrogen is also polar, but if it only contains Hydrogens and Carbons it is non-polar. Enjoy!
