Water, Polar molecules, and an Intro to Solutions. Review of bond types. Review of bond types. Review of bond types. Polar Molecules. If a molecule contains polar covalent bonds, the entire molecule may have a positive end and a negative end.
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The water cycle is one method of natural purification. Energy from the sun causes water to evaporate, dissolved contaminants are left behind as it rises. When the water condenses it returns to earth as precipitation.
Water is unique in the fact that its density decreases when it becomes a solid, this is what causes ice to float.
Heat capacity is a measure of how much heat it takes to heat one gram of a substance 1 ° C.
The large difference in charge allows for Hydrogen bonding to occur between molecules.
The polarity of water also allows water to dissolve other polar molecules.
Ionic substances dissociate into charged ions when dissolved in water form electrolytic solutions – conduct electricity
Substances that stay electronically neutral when dissolved in water are called nonelectrolytes.
Due to waters great ability to be a solvent it can become contaminated easily.
A solution is a homogeneous mixtureof substances composed of at least onesoluteand one solvent that are uniform throughout the sample. This can be in a liquid or gas state.
Non-electrolytes – solutes that form aqueous solutions that do not conduct electricity.