Bellringer
List an example of an acid or base you
are familiar with in everyday life.
What do you know about the pH scal...
Agenda
 Collection Time
 Book Project & Macromolecule notes
 Candy Molecules lab
 Quick Experiment: Milk and Vinegar
...
Properties of Acids
Sour taste
Corrosive to metals
Burns the Skin
Examples of Acids
Acetic Acid in Vinegar
Citric Acid in Oranges and
Lemons
Hydrochloric Acid dissolves
food in your sto...
Properties of Bases
Bitter Taste
Feel “Soapy”
Will irritate your skin
Examples of Bases
Milk of Magnesia
Bleach
Many Soaps
Acid/Base Chemistry
Acids release Hydrogen ions [H+]
when mixed with water.
Bases absorb Hydrogen ions [H+]
when mixed w...
Neutralizations
Since Acids produce [H+] and Bases
absorb [H+], it is possible for acids
and bases to cancel one another....
pH Scale
The strength of Acids and Bases
is measured using the pH scale
Scale goes from 0 to 14
 ACIDS = below 7
 NEUT...
pH and Strength
The further an acid or base is from 7,
the stronger it is.
Examples
 Lemon Juice (2.0) is a stronger ac...
BrainPOP: Acid/Base
Protein Folding
Proteins are long chains of amino acids.
These chains bend and fold into a certain
shape that allows the...
Protein Structure Video Clip
How Acids Denature Proteins
 Acids destroy proteins by “denaturing” them. This
means that the protein gets unwrapped and ...
H+
H+
H+
H+
H+
Explain what caused the milk to curdle. . .
Assignments
12 Review Questions
Using pH to identify liquids
Students should complete their
Quarterly Assessment if not...
Biochem 3: pH & proteins
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Biochem 3: pH & proteins

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Biochem 3: pH & proteins

  1. 1. Bellringer List an example of an acid or base you are familiar with in everyday life. What do you know about the pH scale?
  2. 2. Agenda  Collection Time  Book Project & Macromolecule notes  Candy Molecules lab  Quick Experiment: Milk and Vinegar  Guided Notes: pH & the Effect on Protein  Compare Acids and Bases  Review the use of pH scale  Describe how changes in pH affect proteins
  3. 3. Properties of Acids Sour taste Corrosive to metals Burns the Skin
  4. 4. Examples of Acids Acetic Acid in Vinegar Citric Acid in Oranges and Lemons Hydrochloric Acid dissolves food in your stomach
  5. 5. Properties of Bases Bitter Taste Feel “Soapy” Will irritate your skin
  6. 6. Examples of Bases Milk of Magnesia Bleach Many Soaps
  7. 7. Acid/Base Chemistry Acids release Hydrogen ions [H+] when mixed with water. Bases absorb Hydrogen ions [H+] when mixed with water.
  8. 8. Neutralizations Since Acids produce [H+] and Bases absorb [H+], it is possible for acids and bases to cancel one another. When acids and bases cancel out it is called Neutralizing
  9. 9. pH Scale The strength of Acids and Bases is measured using the pH scale Scale goes from 0 to 14  ACIDS = below 7  NEUTRAL = exactly 7  BASES = above 7
  10. 10. pH and Strength The further an acid or base is from 7, the stronger it is. Examples  Lemon Juice (2.0) is a stronger acid than Beer (4.0) because a pH of 2 is farther from 7.  Ammonia (11.0) is a stronger base than Baking Soda (8.3) because a pH of 11 is farther from 7.
  11. 11. BrainPOP: Acid/Base
  12. 12. Protein Folding Proteins are long chains of amino acids. These chains bend and fold into a certain shape that allows them to perform their job. The shape of the protein is held together by bonds between amino acids on different parts of the chain.
  13. 13. Protein Structure Video Clip
  14. 14. How Acids Denature Proteins  Acids destroy proteins by “denaturing” them. This means that the protein gets unwrapped and the shape is destroyed.  Acids can unwind proteins because the H+ [Hydrogen ions] interfere with the bonds that hold the protein together.  For this reason, it is important for living things to maintain a consistent pH level in bodily fluid. For example, human blood must stay at a pH of 7.4
  15. 15. H+ H+ H+ H+ H+
  16. 16. Explain what caused the milk to curdle. . .
  17. 17. Assignments 12 Review Questions Using pH to identify liquids Students should complete their Quarterly Assessment if not finished yesterday.

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