Friday, April 18, 2008
Thurs-Day 2
Bio- we discussed Lamarck's hypothesis about how the various life forms on Earth evolved; Lamarck incorrectly thought that ACQUIRED characteristics could be passed on to offspring and also that the most prevalent and advantageous characteristics of a given species came about via frequent use of this traits by the parental generations; the characteristics that were not used would not show up in later generations.
Weissman disproved Lamarck's hypothesis by showing that mice tail disuse (which he caused by chopping off the tails of mice) did not produce offspring without tails; in other words, acquired characteristics are not passed on to offspring via heredity.
We introduced Darwin's Theory of Variation and Natural Selection as an explanation of the mechanism of evolution.
Chem 7/8- we did some more Table G solubility problems and saw that you must use the actual amounts of solute whenever there is a question involving adding more or precipitating some solute.
We also saw on Table F that all soluble salts make concentrated saturated solutions whereas all insoluble salts make DILUTE saturated solutions. It's true, even insoluble salts can be added to water and form a saturated solution THOUGH very little of the insoluble salt will be required (perhaps micrograms).
We then derived the dilution formula by relating moles to molarity and volume; then we did some solution dilution problems.
Chem 9-we did some more Table G solubility problems and saw that you must use the actual amounts of solute whenever there is a question involving adding more or precipitating some solute.
We also saw on Table F that all soluble salts make concentrated saturated solutions whereas all insoluble salts make DILUTE saturated solutions. It's true, even insoluble salts can be added to water and form a saturated solution THOUGH very little of the insoluble salt will be required (perhaps micrograms).
We then derived the dilution formula by relating moles to molarity and volume.
Weissman disproved Lamarck's hypothesis by showing that mice tail disuse (which he caused by chopping off the tails of mice) did not produce offspring without tails; in other words, acquired characteristics are not passed on to offspring via heredity.
We introduced Darwin's Theory of Variation and Natural Selection as an explanation of the mechanism of evolution.
Chem 7/8- we did some more Table G solubility problems and saw that you must use the actual amounts of solute whenever there is a question involving adding more or precipitating some solute.
We also saw on Table F that all soluble salts make concentrated saturated solutions whereas all insoluble salts make DILUTE saturated solutions. It's true, even insoluble salts can be added to water and form a saturated solution THOUGH very little of the insoluble salt will be required (perhaps micrograms).
We then derived the dilution formula by relating moles to molarity and volume; then we did some solution dilution problems.
Chem 9-we did some more Table G solubility problems and saw that you must use the actual amounts of solute whenever there is a question involving adding more or precipitating some solute.
We also saw on Table F that all soluble salts make concentrated saturated solutions whereas all insoluble salts make DILUTE saturated solutions. It's true, even insoluble salts can be added to water and form a saturated solution THOUGH very little of the insoluble salt will be required (perhaps micrograms).
We then derived the dilution formula by relating moles to molarity and volume.
# posted by C @ 8:29 AM 
