Saturday, January 26, 2008
Fri-Day 1
Bio- we finished our discussion of the excretory system by focusing on the structure and function of the urinary system. The urinary system is composed of the kidneys, the two URETERS (remember uddERs) through which urine flows from the kidneys to the urinary bladder; the bladder temporarily holds the urine until the bladder fills and then the urine is excreted through the single tube, the URETHRA.
We worked on a handout to reinforce that material; the answers to the handouts are posted on Blackboard so check your work.
We performed the experiment in our "Making Connections" lab. The results, if consistently seen with REPEATED trials AND a LARGE sample size would enable us to have a scientifically supported opinion (the only opinion that has objective meaning) on whether warming up/exercising before the specific "squeezing" exercise contributes more towards muscle fatigue than not exercising first.
We begin our 3rd quarter on Monday; let us take time to think about what we've learned in Biology so far this year, what habits are helpful in learning this subject well, and what we can do to avoid habits that have been detrimental/harmful.
Chem 7- we took the written-response part of the second quarter exam; I am grading those over the weekend.
So far so good, though some of you need to look at the notes regarding the HUGE difference between a BOND (ionic or covalent) and a mere INTERMOLECULAR ATTRACTION.
BONDS of ANY KIND are over a THOUSAND TIMES stronger than ANY intermolecular attraction.
That is why, when you boil ANY molecular liquid, you merely can get the molecules to OVERCOME their INTERMOLECULAR attractions but NEVER do you break ANY of the bonds WITHIN the molecule, i.e. when you boil water, you STILL have covalently BONDED H2O in the gas phase; you've merely separated the various water molecules by giving them enough energy to overcome their extreme dipole-dipole attractions (called hydrogen "bonding"- which is NOT a bond because no electrons are shared BETWEEN separate molecules). If I have any updates/emphases about Monday's exam, I'll post them here and on Blackboard by Sunday.
Chem 8/9- we took the written-response part of the second quarter exam; I am grading those over the weekend.
So far so good, though some of you need to look at the notes regarding the HUGE difference between a BOND (ionic or covalent) and a mere INTERMOLECULAR ATTRACTION.
BONDS of ANY KIND are over a THOUSAND TIMES stronger than ANY intermolecular attraction.
That is why, when you boil ANY molecular liquid, you merely can get the molecules to OVERCOME their INTERMOLECULAR attractions but NEVER do you break ANY of the bonds WITHIN the molecule, i.e. when you boil water, you STILL have covalently BONDED H2O in the gas phase; you've merely separated the various water molecules by giving them enough energy to overcome their extreme dipole-dipole attractions (called hydrogen "bonding"- which is NOT a bond because no electrons are shared BETWEEN separate molecules).
We then played some compound naming Jeopardy. If I have any updates/emphases about Monday's exam, I'll post them here and on Blackboard by Sunday.
We worked on a handout to reinforce that material; the answers to the handouts are posted on Blackboard so check your work.
We performed the experiment in our "Making Connections" lab. The results, if consistently seen with REPEATED trials AND a LARGE sample size would enable us to have a scientifically supported opinion (the only opinion that has objective meaning) on whether warming up/exercising before the specific "squeezing" exercise contributes more towards muscle fatigue than not exercising first.
We begin our 3rd quarter on Monday; let us take time to think about what we've learned in Biology so far this year, what habits are helpful in learning this subject well, and what we can do to avoid habits that have been detrimental/harmful.
Chem 7- we took the written-response part of the second quarter exam; I am grading those over the weekend.
So far so good, though some of you need to look at the notes regarding the HUGE difference between a BOND (ionic or covalent) and a mere INTERMOLECULAR ATTRACTION.
BONDS of ANY KIND are over a THOUSAND TIMES stronger than ANY intermolecular attraction.
That is why, when you boil ANY molecular liquid, you merely can get the molecules to OVERCOME their INTERMOLECULAR attractions but NEVER do you break ANY of the bonds WITHIN the molecule, i.e. when you boil water, you STILL have covalently BONDED H2O in the gas phase; you've merely separated the various water molecules by giving them enough energy to overcome their extreme dipole-dipole attractions (called hydrogen "bonding"- which is NOT a bond because no electrons are shared BETWEEN separate molecules). If I have any updates/emphases about Monday's exam, I'll post them here and on Blackboard by Sunday.
Chem 8/9- we took the written-response part of the second quarter exam; I am grading those over the weekend.
So far so good, though some of you need to look at the notes regarding the HUGE difference between a BOND (ionic or covalent) and a mere INTERMOLECULAR ATTRACTION.
BONDS of ANY KIND are over a THOUSAND TIMES stronger than ANY intermolecular attraction.
That is why, when you boil ANY molecular liquid, you merely can get the molecules to OVERCOME their INTERMOLECULAR attractions but NEVER do you break ANY of the bonds WITHIN the molecule, i.e. when you boil water, you STILL have covalently BONDED H2O in the gas phase; you've merely separated the various water molecules by giving them enough energy to overcome their extreme dipole-dipole attractions (called hydrogen "bonding"- which is NOT a bond because no electrons are shared BETWEEN separate molecules).
We then played some compound naming Jeopardy. If I have any updates/emphases about Monday's exam, I'll post them here and on Blackboard by Sunday.
# posted by C @ 12:05 PM 
