Wednesday, February 27, 2008
Wednes-Day 1
Bio- we continued with the diseases/disorders of the nervous system, discussing polio, epilepsy, Parkinson's, and Alzheimer's.
Since these are diseases of the nervous system, most of them result in some sort of muscular paralysis, lack of coordination, or memory/reasoning loss.
We then started a worksheet on the CNS and ended with a lab on reflex times with and without distractions. Consciously controlled voluntary reflexes may be slowed if your brain/CNS is "multi-tasking"/processing other stimuli.
Chem 7- we did a few more permutations of "percent water in a hydrate" problems. Then, we further developed the skill of taking a compound's percent composition, converting/calculating the empirical formula of the compound from that information, and using the empirical formula mass along with the given molecular mass to determine the molecular formula of the compound. The required information to get the molecular formula from the empirical formula is the molecular mass of the compound. Dividing the molecular mass by the empirical formula mass gets you (ALWAYS) a whole number, which is the "SCALING FACTOR". Just multiply the subscripts in the empirical formula by the scaling factor and you will get the correct molecular formula of the compound. This process is not necessary for salts because ALL salt/ionic compound formulas are/must be empirical formulas (i.e. the lowest whole-number ratio of the cations to the anions in the lattice).
Chem 8/9- we determined the "percent water in a hydrate" by taking a one mole sample of the hydrated salt, getting its formula mass, and dividing the mass due to the water by the whole hydrate formula mass (x 100%).
Then, we further developed the skill of taking a compound's percent composition, converting/calculating the empirical formula of the compound from that information, and using the empirical formula mass along with the given molecular mass to determine the molecular formula of the compound. The required information to get the molecular formula from the empirical formula is the molecular mass of the compound. Dividing the molecular mass by the empirical formula mass gets you (ALWAYS) a whole number, which is the "SCALING FACTOR". Just multiply the subscripts in the empirical formula by the scaling factor and you will get the correct molecular formula of the compound. This process is not necessary for salts because ALL salt/ionic compound formulas are/must be empirical formulas (i.e. the lowest whole-number ratio of the cations to the anions in the lattice).
We then did a lab, making magnesium oxide salt from magnesium metal and oxygen from the air. With this data, we will determine the empirical formula of this salt.
Since these are diseases of the nervous system, most of them result in some sort of muscular paralysis, lack of coordination, or memory/reasoning loss.
We then started a worksheet on the CNS and ended with a lab on reflex times with and without distractions. Consciously controlled voluntary reflexes may be slowed if your brain/CNS is "multi-tasking"/processing other stimuli.
Chem 7- we did a few more permutations of "percent water in a hydrate" problems. Then, we further developed the skill of taking a compound's percent composition, converting/calculating the empirical formula of the compound from that information, and using the empirical formula mass along with the given molecular mass to determine the molecular formula of the compound. The required information to get the molecular formula from the empirical formula is the molecular mass of the compound. Dividing the molecular mass by the empirical formula mass gets you (ALWAYS) a whole number, which is the "SCALING FACTOR". Just multiply the subscripts in the empirical formula by the scaling factor and you will get the correct molecular formula of the compound. This process is not necessary for salts because ALL salt/ionic compound formulas are/must be empirical formulas (i.e. the lowest whole-number ratio of the cations to the anions in the lattice).
Chem 8/9- we determined the "percent water in a hydrate" by taking a one mole sample of the hydrated salt, getting its formula mass, and dividing the mass due to the water by the whole hydrate formula mass (x 100%).
Then, we further developed the skill of taking a compound's percent composition, converting/calculating the empirical formula of the compound from that information, and using the empirical formula mass along with the given molecular mass to determine the molecular formula of the compound. The required information to get the molecular formula from the empirical formula is the molecular mass of the compound. Dividing the molecular mass by the empirical formula mass gets you (ALWAYS) a whole number, which is the "SCALING FACTOR". Just multiply the subscripts in the empirical formula by the scaling factor and you will get the correct molecular formula of the compound. This process is not necessary for salts because ALL salt/ionic compound formulas are/must be empirical formulas (i.e. the lowest whole-number ratio of the cations to the anions in the lattice).
We then did a lab, making magnesium oxide salt from magnesium metal and oxygen from the air. With this data, we will determine the empirical formula of this salt.
# posted by C @ 12:11 PM 
