Saturday, March 8, 2008
Fri-Day 2
Bio- we discussed the female reproductive system, focusing on the production of an egg/ovum and its pathway from the ovaries to the oviducts/Fallopian tubes (where it may or may not be fertilized to form a zygote) to the uterus. We noted the two main hormones that regulate the production and development of the egg: estrogen and progesterone. Next week, we will see the whole feedback mechanism by which the female reproductive system is regulated.
Chem 7/8: we did several stoichiometry problems: an acid-base neutralization (forming a salt and water) and a gas forming reaction. From these problems, we methodically took the gram, liter, or particles given, converted them to MOLES, and then (THE KEY STEP!) used the BALANCED EQUATION to determine the number or MOLES of the requested substance. We then converted moles of that substance to grams or liters (if GAS at STP) or particles (atoms or molecules or formula units, depending on the type of substance).
So, these types of problems use your knowledge of BOTH "mole conversions" and "balanced equations". With practice, these problems can be done in three to five steps taking about two to five minutes each; yes, there is a lot of writing and unit cancellation but that is the nature of these problems so that you can prove/see what you are doing.
We then did a stoichiometry lab involving the cationic single replacement of a copper II cation by a magnesium ion.
Chem 9- we did several stoichiometry problems: an acid-base neutralization (forming a salt and water) and a gas forming reaction. From these problems, we methodically took the gram, liter, or particles given, converted them to MOLES, and then (THE KEY STEP!) used the BALANCED EQUATION to determine the number or MOLES of the requested substance. We then converted moles of that substance to grams or liters (if GAS at STP) or particles (atoms or molecules or formula units, depending on the type of substance).
So, these types of problems use your knowledge of BOTH "mole conversions" and "balanced equations". With practice, these problems can be done in three to five steps taking about two to five minutes each; yes, there is a lot of writing and unit cancellation but that is the nature of these problems so that you can prove/see what you are doing.
Chem 7/8: we did several stoichiometry problems: an acid-base neutralization (forming a salt and water) and a gas forming reaction. From these problems, we methodically took the gram, liter, or particles given, converted them to MOLES, and then (THE KEY STEP!) used the BALANCED EQUATION to determine the number or MOLES of the requested substance. We then converted moles of that substance to grams or liters (if GAS at STP) or particles (atoms or molecules or formula units, depending on the type of substance).
So, these types of problems use your knowledge of BOTH "mole conversions" and "balanced equations". With practice, these problems can be done in three to five steps taking about two to five minutes each; yes, there is a lot of writing and unit cancellation but that is the nature of these problems so that you can prove/see what you are doing.
We then did a stoichiometry lab involving the cationic single replacement of a copper II cation by a magnesium ion.
Chem 9- we did several stoichiometry problems: an acid-base neutralization (forming a salt and water) and a gas forming reaction. From these problems, we methodically took the gram, liter, or particles given, converted them to MOLES, and then (THE KEY STEP!) used the BALANCED EQUATION to determine the number or MOLES of the requested substance. We then converted moles of that substance to grams or liters (if GAS at STP) or particles (atoms or molecules or formula units, depending on the type of substance).
So, these types of problems use your knowledge of BOTH "mole conversions" and "balanced equations". With practice, these problems can be done in three to five steps taking about two to five minutes each; yes, there is a lot of writing and unit cancellation but that is the nature of these problems so that you can prove/see what you are doing.
# posted by C @ 10:25 PM 
