1. 3.2 Water and Solutions I. Properties of Water A. Ice floats
1. prevents lakes/rivers from freezing solid.
a. life exists under ice in water
B. Water absorbs & retains heat well
1. absorbs lots of heat without changing temperature
2. Takes a long time to cool
a. Keeps temps on Earth from changing too fast.
3. Helps organisms maintain a constant internal temp.

2. C. Cohesion – water sticking to water
1. ex- a glass of liquid just about to spill over.

3. D. Adhesion – water sticking to other polar substances.
1. ex.- milk sticking to the container when you pour it out

4. E. A combination of adhesion & cohesion
E. A combination of adhesion & cohesion causes water to move upward in plants
II. Solutions
A. Def- a mixture of one or more substances are evenly distributed in another substance.
1. looks the same throughout
a. ex.- kool-aid

5. D. Acids and Bases
1. Acids – compounds that form extra hydronium ions.
a. ex- stomach acid (HCl)
2. Bases – compounds that form extra hydroxide ions.
a. ex- drano (NaOH)
E. pH and Buffers
1. pH is a measure of how acidic or basic a solution is.

6. 2. The pH scale is a scale of 0-14
a. 0-6 acidic solution
b. 7 neutral
c basic solution
3. a buffer is a substance that reacts to prevent pH changes in a solution.
a. ex.- antacids (tums)