Thursday, January 7, 2010
Thurs-Day 1
Bio 3/6- we developed a "master chart" showing each part of the digestive tract/tube (the "alimentary canal"), its main function in digestion (chemical and/or mechanical), the accessory organs - pancreas and liver- and their functions, as well as the macronutrients (larger nutrient molecules) digested and the end-products/small simple molecules that are formed from the nutrient digestion in each part of the digestive system.
We did a starch digestion lab in which we used iodine solution as the starch indicator; ideally, we showed that starch is present in pretzels (the iodine solution turns blue-black when it reacts with starch) and flour but when the flour or pretzels are mixed with amylase enzyme from saliva, the starch gets broken down so that when iodine is added, no blue-black color appears (the test is negative for starch).
AP Chem - we derived yet another shortcut formula for getting the molar mass of a solute from Raoult's Law data. The IMPORTANT thing to keep track of is the TYPE (solute or solvent) and PHASE of EACH substance used in the MOLE FRACTION data. In our shortcut formula, we use the mole fraction of each component in the LIQUID PHASE!
We then saw and discussed the source and measurement of vapor pressure and analyzed a series of vapor pressure curves.
Check Blackboard for more practice problems and solutions.
We did a starch digestion lab in which we used iodine solution as the starch indicator; ideally, we showed that starch is present in pretzels (the iodine solution turns blue-black when it reacts with starch) and flour but when the flour or pretzels are mixed with amylase enzyme from saliva, the starch gets broken down so that when iodine is added, no blue-black color appears (the test is negative for starch).
AP Chem - we derived yet another shortcut formula for getting the molar mass of a solute from Raoult's Law data. The IMPORTANT thing to keep track of is the TYPE (solute or solvent) and PHASE of EACH substance used in the MOLE FRACTION data. In our shortcut formula, we use the mole fraction of each component in the LIQUID PHASE!
We then saw and discussed the source and measurement of vapor pressure and analyzed a series of vapor pressure curves.
Check Blackboard for more practice problems and solutions.
# posted by C @ 11:06 AM 
