Tuesday, September 23, 2008
Tues-Day 2
AP Chem- we did two practice problems in depth, going over what to do and, more importantly, what not to do when applying Planck's equation and DeBroglie's equation. We carefully checked all units and cancellations, which you will do on tomorrow's tests and beyond.
We applied Planck's equation as required in a bond dissociation energy problem. A photon of sufficient energy is required to break a covalent bond in a molecule. We determined the maximum wavelength/minimum energy that a photon needed to break the covalent bond in an iodine molecule.
We then used DeBroglie's equation to get the theoretical wavelength of a proton and the theoretical yet measurable wavelength of an electron. An electron is a light enough particle that its wave nature can be seen and measured (recall the GN Thomson electron interference pattern experiment).
Keep practicing these problems and other past problems from this unit and good luck tomorrow.
Bio 6- we reviewed the structure of lipids/fats and saw the difference between a saturated and an unsaturated fat. We then got back into proteins, showing how they form via the dehydration synthesis of amino acids. There are 20 different amino acids but most proteins do not have all 20 different ones in their polypeptide chain.
We discussed the types of protein:
- embedded in the cell membrane, we have: recognition, receptor, transport, and adhesion proteins. There are microfilament proteins in cells and muscle fibers.
- enzymes are protein catalysts that speed up the biochemical reactions in your cells/bodies; there is a SPECIFIC enzyme for each reaction
- hormones
-antibodies
-two very specific proteins are hemoglobin (in red blood cells) and chlorophyll (in plant cells)
Bio 7/8- we reviewed the structure of lipids/fats and saw the difference between a saturated and an unsaturated fat. We then got back into proteins, showing how they form via the dehydration synthesis of amino acids. There are 20 different amino acids but most proteins do not have all 20 different ones in their polypeptide chain.
We discussed the types of protein:
- embedded in the cell membrane, we have: recognition, receptor, transport, and adhesion proteins. There are microfilament proteins in cells and muscle fibers.
- enzymes are protein catalysts that speed up the biochemical reactions in your cells/bodies; there is a SPECIFIC enzyme for each reaction
- hormones
-antibodies
-two very specific proteins are hemoglobin (in red blood cells) and chlorophyll (in plant cells)
We then did an activity in which we showed the making of more complex molecules from simpler building blocks.
We applied Planck's equation as required in a bond dissociation energy problem. A photon of sufficient energy is required to break a covalent bond in a molecule. We determined the maximum wavelength/minimum energy that a photon needed to break the covalent bond in an iodine molecule.
We then used DeBroglie's equation to get the theoretical wavelength of a proton and the theoretical yet measurable wavelength of an electron. An electron is a light enough particle that its wave nature can be seen and measured (recall the GN Thomson electron interference pattern experiment).
Keep practicing these problems and other past problems from this unit and good luck tomorrow.
Bio 6- we reviewed the structure of lipids/fats and saw the difference between a saturated and an unsaturated fat. We then got back into proteins, showing how they form via the dehydration synthesis of amino acids. There are 20 different amino acids but most proteins do not have all 20 different ones in their polypeptide chain.
We discussed the types of protein:
- embedded in the cell membrane, we have: recognition, receptor, transport, and adhesion proteins. There are microfilament proteins in cells and muscle fibers.
- enzymes are protein catalysts that speed up the biochemical reactions in your cells/bodies; there is a SPECIFIC enzyme for each reaction
- hormones
-antibodies
-two very specific proteins are hemoglobin (in red blood cells) and chlorophyll (in plant cells)
Bio 7/8- we reviewed the structure of lipids/fats and saw the difference between a saturated and an unsaturated fat. We then got back into proteins, showing how they form via the dehydration synthesis of amino acids. There are 20 different amino acids but most proteins do not have all 20 different ones in their polypeptide chain.
We discussed the types of protein:
- embedded in the cell membrane, we have: recognition, receptor, transport, and adhesion proteins. There are microfilament proteins in cells and muscle fibers.
- enzymes are protein catalysts that speed up the biochemical reactions in your cells/bodies; there is a SPECIFIC enzyme for each reaction
- hormones
-antibodies
-two very specific proteins are hemoglobin (in red blood cells) and chlorophyll (in plant cells)
We then did an activity in which we showed the making of more complex molecules from simpler building blocks.
# posted by C @ 2:54 PM 
