Thursday, February 28, 2008
Thurs-Day 1
Bio- due Monday, outline text section 36.3
We discussed the mechanism by which drugs affect the central nervous system.
Drugs affect the body by either increasing or decreasing the secretion or absorption of neurotransmitters between neurons. Stimulants increase neurotransmitter secretion or absorption and depressants/sedative decrease neurotransmitter secretion or absorption.
We listed several stimulants: amphetamines, cocaine, nicotine, caffeine.
Hallucinogens stimulate the cerebral neurons to create hallucinations or altered perceptions.
Narcotics (such as heroin, codeine, and morphine), barbiturates, and alcohol depress the central nervous system and can numb or reduce pain.
Chem 7/8- The unit hw is due tomorrow, Friday.
After our well-executed organic production, we continued doing more % composition to empirical formula to molecular formula problems. We noted that, as a check on our work, the "scaling factor" will always turn out to be a WHOLE NUMBER. If it is not, then there MUST be an error in the empirical formula (or a misprint in the question, perhaps) so you should go back and retry the empirical formula calculation.
We then returned to the mole triangle to see how, at STP, you can determine the molecular mass of a gas from its density (and vice-versa).
To get the STP gas density for a given particular gas, just calculate its molar mass (formula mass) and divide that by 22.4 liters per mole. That's it!
To get the molar mass (formula mass) of a gas from its density at STP, just MULTIPLY the density (in grams per liter) by 22.4 liters per mole. That's it!.
Chem 9- The unit hw is due tomorrow, Friday.
We continued doing more % composition to empirical formula to molecular formula problems. We noted that, as a check on our work, the "scaling factor" will always turn out to be a WHOLE NUMBER. If it is not, then there MUST be an error in the empirical formula (or a misprint in the question, perhaps) so you should go back and retry the empirical formula calculation.
We then returned to the mole triangle to see how, at STP, you can determine the molecular mass of a gas from its density (and vice-versa).
To get the STP gas density for a given particular gas, just calculate its molar mass (formula mass) and divide that by 22.4 liters per mole. That's it!
To get the molar mass (formula mass) of a gas from its density at STP, just MULTIPLY the density (in grams per liter) by 22.4 liters per mole. That's it!.
We discussed the mechanism by which drugs affect the central nervous system.
Drugs affect the body by either increasing or decreasing the secretion or absorption of neurotransmitters between neurons. Stimulants increase neurotransmitter secretion or absorption and depressants/sedative decrease neurotransmitter secretion or absorption.
We listed several stimulants: amphetamines, cocaine, nicotine, caffeine.
Hallucinogens stimulate the cerebral neurons to create hallucinations or altered perceptions.
Narcotics (such as heroin, codeine, and morphine), barbiturates, and alcohol depress the central nervous system and can numb or reduce pain.
Chem 7/8- The unit hw is due tomorrow, Friday.
After our well-executed organic production, we continued doing more % composition to empirical formula to molecular formula problems. We noted that, as a check on our work, the "scaling factor" will always turn out to be a WHOLE NUMBER. If it is not, then there MUST be an error in the empirical formula (or a misprint in the question, perhaps) so you should go back and retry the empirical formula calculation.
We then returned to the mole triangle to see how, at STP, you can determine the molecular mass of a gas from its density (and vice-versa).
To get the STP gas density for a given particular gas, just calculate its molar mass (formula mass) and divide that by 22.4 liters per mole. That's it!
To get the molar mass (formula mass) of a gas from its density at STP, just MULTIPLY the density (in grams per liter) by 22.4 liters per mole. That's it!.
Chem 9- The unit hw is due tomorrow, Friday.
We continued doing more % composition to empirical formula to molecular formula problems. We noted that, as a check on our work, the "scaling factor" will always turn out to be a WHOLE NUMBER. If it is not, then there MUST be an error in the empirical formula (or a misprint in the question, perhaps) so you should go back and retry the empirical formula calculation.
We then returned to the mole triangle to see how, at STP, you can determine the molecular mass of a gas from its density (and vice-versa).
To get the STP gas density for a given particular gas, just calculate its molar mass (formula mass) and divide that by 22.4 liters per mole. That's it!
To get the molar mass (formula mass) of a gas from its density at STP, just MULTIPLY the density (in grams per liter) by 22.4 liters per mole. That's it!.
# posted by C @ 3:09 PM 
