Module 6 Lesson 3 Flashcards
Polar Molecule
molecule with oppositely charged regions. Happens because an atom in a polar covalent bond is holding onto the electrons more then the other atoms
Water Molecules Behavior
When water molecules are around other water molecules, they have attraction from the slightly positive hydrogen atoms and slightly negative oxygen atoms
Hydrogen Bond
Attraction of the slightly positive charge to a negative charge in a DIFFERENT molecule.
Cohesion
Water is attracted to water because of H-bonds
Adhesion
Water is attracted to other things
Capillary Action
Uses adhesion to move up other substances
High Specific Heat
Requires more energy to change the temperature of water compared to other substances
High Heat of Vaporization
Requires more heat energy to make water into gas because the h-bonds are keeping the water molecules together in liquid form
Ice and Density
When water freezes, the molecules do not get close together like other solids, they spread apart causing ice to be less dense then water. This is why ice floats
Water as a Solvent
Water is able to dissolve more substances then any other liquid. Since water is polar, it causes attractions with many other molecules dissolving lots of substances.
Water Behavior around Ionic Solutes
Ions become attracted to water molecules, if their is a strong enough attraction the Ionic solute will dissolve, if not, it will not dissolve.
Van der Waals forces
attractive forces between molecules.
Mixture
combination of two or more different substances in which each substance keeps its individual characteristics; can have a uniform composition (homogeneous) or have distinct areas of substances (heterogeneous).
Solution
homogeneous mixture whose components cannot be distinguished and can be classified as liquid, gaseous, solid, or a combination; the method of transport for materials that are dissolved in a stream’s water.
Solvent
substance in which another substance is dissolved.
