SciHawks

http://www.sciencedaily.com/releases/2007/12/071217171416.htm

This one is on the development of LIVING CELLS from laboratory synthesized (NOT extracted from a living organism) DNA. This could be one of the most revolutionary developments EVER in Biology!

http://www.washingtonpost.com/wp-dyn/content/article/2007/12/16/AR2007121601900_pf.html

This one is on the use of a thin protein film, which coats food before deep-frying in fat in order to prevent fat seepage/soaking into the cooking food. The result is a 25% to 75% reduction in fat content of the fried food. Biochemistry, good times.

http://www.sciencedaily.com/videos/2006/0111-lowfat_fried_food.htm

As part of your review for Thursday's exam, check out the animations on Blackboard.

Today, we went over some of the unit exam objectives and we will finish going over the rest of the objectives tomorrow.

We also went over our lab, reviewing the proper terms and procedures of any scientific investigation/experiment. We identified the purpose of the experiment, the independent and dependent variables, the controlled (kept equal) variables, and the control group. Our experimental procedure had two relative groups but no control group (the group with no muscular contractions). We also decided on an appropriate graph that showed the difference between the two experimental groups.

Chem 7- We practiced figuring the correct chemical formula for each type of binary salt. Binary salts are composed of metal cations and nonmetal anions. The charge on each cation and anion determines the ratio of the cations to anions in the salt's lattice of ions.

We worked out a chart showing practically EVERY possible binary salt formula. ALWAYS check your final answer by making sure that the total positive charge from the cation or cations in the formula EQUALS the total negative charge from the anion or anions in the formula.
We gave an example of each type of salt empirical/chemical formula that can form.

We also took chemical formulas and worked backwards to get the charge of the cation and anion in the formula. Salts do not have a net charge so you will not write charges in your final formula!

Tomorrow, we will look at some transition metal salts and then review for Thursday's test.

Chem 8/9- We saw how binary salts can form from atoms of a metal and a nonmetal. When metal and nonmetal atoms collide, because the metal atom has a low Zeff on its valence electron(s) and the nonmetal atom has a high Zeff on its valence electrons, the metal will ALWAYS lose ALL of its valence electrons and the nonmetal will gain enough electrons to form a noble gas valence electron configuration. So, the metal atoms become (smaller) cations and the nonmetal atoms become (larger) anions; THEN, the cations and anions form IONIC bonds to each other in a regular geometric pattern called a LATTICE because positively charged particles (cations) attract negatively charged particles (anions).

We practiced figuring the correct chemical formula for each type of binary salt. Binary salts are composed of metal cations and nonmetal anions. The charge on each cation and anion determines the ratio of the cations to anions in the salt's lattice of ions.

We worked out a chart showing practically EVERY possible binary salt formula. ALWAYS check your final answer by making sure that the total positive charge from the cation or cations in the formula EQUALS the total negative charge from the anion or anions in the formula.
We gave an example of each type of salt empirical/chemical formula that can form.

We also took chemical formulas and worked backwards to get the charge of the cation and anion in the formula. Salts do not have a net charge so you will not write charges in your final formula!

Tomorrow, we will look at some transition metal salts and then review for Thursday's test.

# posted by C @ 7:36 AM