what type of substance would dissolve well in h2o and what type would not dissolve well in h2o?

Question

give examples

Answer 1

ionic and polar in water
ionic: salt
polar: sugar

nonpolar doesn't in water
nonpolar: vegetable oil

Answer 2

Just remember that "like dissolves like." By this, I mean that a polar substance dissolves other polar substances, and a nonpolar substance dissolves other nonpolar substances. Since water is polar, it easily dissolves polar and charged things such as sugar, salt, alcohol, etc. Conversely, water is not so good at dissolving nonpolar things like fats and oils. Think about when you get butter or oil on your hand and you want to wash it off. If you just use water, it doesn't wash off very well. However, if you use soap, it comes off quite easily. This is because soap has a polar end and a nonpolar end - the polar end is attracted to the polar water, while the nonpolar end is attracted to the nonpolar oil.