SciHawks

AP Chem- we started to get to the powerful and practical parts of this unit. We did a multi-part problem in which we went from percent composition to empirical formula to molecular formula. We saw how to calculate a "scaling factor" in order to know by which INTEGER to multiply the subscripts in the empirical formula to get the molecular formula. If the scaling factor as calculated turns out NOT to be a whole number, then the empirical formula that you are using MUST be WRONG, so you must correct whatever errors that led to that incorrect empirical formula mass.
We then described the technique of combustion analysis and began a problem in which we deduced the empirical formula of a compound from the masses of CO2 and H2O produced from a given mass of the unknown.

Bio 6- we drew out and explained in detail the effect of placing cells in hypotonic, isotonic, or hypertonic solutions.
We categorized and gave examples of various types of passive and active transport.
We then discussed the various levels of organization in complex organisms.

Bio 7/8 - we drew out and explained in detail the effect of placing cells in hypotonic, isotonic, or hypertonic solutions.
We categorized and gave examples of various types of passive and active transport.
We then discussed the various levels of organization in complex organisms.
We finished out Plant and Animal Cell lab; then we added an activity to that lab to see the effect of hypertonic saltwater solution on the Elodea plant cells; we noted that the cells shriveled due to osmosis of water out of the cell to the region of lower water concentration (the hypertonic solution).