Mr. Sheehan’s Pd
Name
Ac Bio Chp 2.2 Review WS
1.
Water is polar. What does that mean?
Draw a water molecule showing where the positive and negative charges are.
Polar = unequal charge
2. Water forms ____hydrogen__________________ bonds between a hydrogen atom on one molecule
and the ____oxygen___________________ atom of ___another___________________ molecule.
3. Define cohesion and adhesion. Give an example of each.
Cohesion – attraction between molecules of the same substance.
together to fill a cup over the brim
Ex: Water molecules sticking
Adhesion –attraction between molecules of different substances. Ex: Water sticking to a cup/climbing
up the sides
4. The amount of energy required to raise the temperature of a substance is its __heat capacity__.
5. A. Define mixture.
physical combination of two/more things – NO chemical change
B. What is the difference between a compound and a mixture? Give an example of each.
Compound = chemical combination of two/more elements
Ex – H2O
Mixture = physical combination of two/more things
Ex – Salt water, Cran-apple juice
6. What is the difference between a solution and a suspension? Give an example of each.
Solution = evenly mixed mixture
Ex – Salt water
Suspension = mixture where substances are not dissolved
Ex – Oreos in milk, blood
7. I pour chocolate syrup into my milk. What is the solvent and what is the solute?
Solvent = milk
Solute = chocolate syrup
8. ____Water______________ is the universal solvent.
   FLIP TO THE BACK
   FLIP TO THE BACK   
Mr. Sheehan’s Pd
Name
9. The pH scale measures the concentration of __H+_________ ions.
10. Draw a pH scale. Indicate the following:
A. Number range
2. Neutral
III. Labeled arrow showing increasing acidity and another arrow for increasing basicity.
Base
11. Acids form __H+_______ ions. Bases form __OH-_______ ions.
12. ___Buffer___________ - a weak acid or base that can react with strong acids or bases to prevent
changes in pH.
13. If I have a strong acid (pH = 2), I would use a base buffer with a pH of __12-14______.
14. Why are buffers important to organisms?
Help maintain homeostasis