Ok, so it’s pretty obvious I was frustrated during class today. My problem is that this class just isn’t going to work if you guys aren’t engaged in class. That means everyone attends (on time) and participates in the activity at hand. I don’t ask you guys to do a lot. Not because I want this class to be easy but because I want to give you the freedom and time to internalize the content. I understand that some of the content is difficult and maybe not that interesting to you. This is a science course and we need to learn science. We need to find the solution to making this class a dynamic exploration of the science behind climate change. I assumed that the fact that you were motivated honors students implies you would be engaged but clearly that wasn’t a good assumption.
So how do we move forward? I fear that I might have to initiate draconian policies concerning attendance, behavior and assignments. I really hate to do this because the result will clearly strangle the creativity and freedom of the course.
The outcomes of this class require that we investigate the science of climate change. I also want you all to engage in scientific thinking, i.e., using evidence to draw conclusions. To do this we MUST learn some science. How we learn that science is up for discussion. So, PLEASE let me know what you think.
I didn’t really understand oxide reactions. I know that it has to do with acid rain. Also I didn’t understand atomospheric and emr interactions. CFCs in ozone depletion were confusing as well.
Atoms try to have 8 electrons in their outer energy level in order to be more stable, and sharing or transferring electrons can allow atoms to achieve this state. Covalent Bonds are formed when electrons are equally shared between atoms, and ionic bonds are formed when atoms lose and gain electrons between themselves. Covalent bonds involve non-metals or hydrogen, while pure ionic compounds are usually crystalline solids, liquids, or gases. (Info found on http://www.promotega.org/UGA06004/ionic_bonds.html)
The word stoichiometry derives from two Greek words: stoicheion (meaning “element”) and metron (meaning “measure”). Stoichiometry deals with calculations about the masses (sometimes volumes) of reactants and products involved in a chemical reaction.
Almost all of stoichiometry can be solved relatively easily using dimensional analysis. Dimensional analysis is just using units, instead of numbers or variables, to do math, usually to see how they cancel out. For instance, it is easy to see that:
Moles
The mole is a unit used to measure the number of particles in a substance (where particles can be atoms, molecules, electrons, ions etc.). One mole of something contains 6.02205 × 1023 particles. This rather large quantity is a constant called Avogadro’s Number, which is abbreviated as NA. It simply refers to the number of particles in one mole.
For example, one mole of helium gas contains 6.022×1023 atoms; 2 moles of oxygen gas contains 1.204×1024 molecules.
Moles and Mass
It would be useful to be able to convert between the number of moles and the mass of a substance. The molar mass is the mass of one mole of a substance, measured in grams per mole or . Not by coincidence, the molar mass is the same as the atomic weight of a substance (this is how the concept of moles was originally defined).
For example, the molar mass (and atomic weight) of carbon-12 is 12 g·mol-1, so 1 mole of carbon-12 weighs 12 grams. Similarly, chlorine has a molar mass of 35.45 g·mol-1, so one mole of chlorine atoms weighs 35.45 g. There are two chlorine atoms in one molecule of Cl2 gas, so one mole of Cl2 gas weighs 70.90 g.
Negatively charged ions that continually orbit the nucleus of an atom and are held in orbit by attraction to the positive charge of the nucleus. See also protons, neutrons.
Protons:
Positively charged ions, which cluster with neutrons in the centre of an atom and comprise its nucleus.
Neutrons:
Subatomics particle with no net charge which cluster with protons in the centre of an atom and comprise its nucleus
Atomic Mass:
The mass of a neutral atom. Its value in atomic mass units (u) is approximately equal to the sum of the number of protons and neutrons in the nucleus of the atom.
An ELECTRON’S ENERGY LEVEL is the amount of energy required by an electron to stay inorbit. The energy balence keeps electrons in orbit, and as the levels of energy fluctuate the
electron comes closer or moves farther away from the nucleus. When the electron gains energy
it moves farther from the nucleus, while as it loses energy it moves in closer.
The periodic table is a table which displays all of the known chmeical elements. Invented by Demitri Mendeleev in 1869, the table shows recurring patterns in the elements. The elements are listed by increasing atomic numbers, or the number of protons in the atomic nucleus. The verical columns of elements with similar properities are called “groups.” The horizontal rows are known as “periods.” There are currently 117 elements in the periodic table. It has been this way since 2006. Over time, the table has been changed due to discovery of new elements.
Posted by Dr. Metzker 
Posted by audreyreiner 
Posted by lindseyg09 
. Not by coincidence, the molar mass is the same as the atomic weight of a substance (this is how the concept of moles was originally defined).
