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General chemistry

General chemistry (sometimes called "gen chem" for short) is a course often taught at the high school and introductory university level. It is intended to serve as a broad introduction to a variety of concepts in chemistry and is widely taught. At the university level, it is also sometimes used as a weed out course for disciplines (sometimes related, sometimes not) which are perceived to require a high level of intellectual rigor or large course loads. It is also one of the few chemistry courses in most universities that does not explicitly explore a particular discipline such as organic chemistry or analytical chemistry.

General chemistry courses typically introduce concepts such as stoichiometry, prediction of reaction products, thermodynamics, nuclear chemistry, electrochemistry, chemical kinetics, and many of the rudiments of physical chemistry. Though the list of subjects covered is typically broad, leading some to criticize both the class and the discipline as encouraging memorization, most general chemistry courses are firmly grounded in several fundamental physical rules for which the primary challenge is understanding when the rules are applicable.


From Yahoo Answers

Question:Is '6.02 times ten to the power of 23 chemical units of a pure substance' right, or is there some standard test question answer? Thanks - thought the other was a little complicated!

Answers:"A mole of a substance is the mass of a substance that has the same number of particles as there are atoms in 12g of carbon 12" Im doing AS chemistry and I was also confused with the definition. I asked my teacher and he said just think of it as the mass of any substance that has the same number of atoms relative to a scale where 12g of carbon is 12. You can write down Avogadro's number, but he said it wasn't necessary unless it specifies. Hope this makes things clearer.

Question:plz do not give me the definition of the term, what i need is explanation Thx

Answers:It's basically the energy you need in order to do the reaction. The reason why there is this "hump" is that in between the reactant and product is a very unstable transition state. The energy of this transition state is represented by the activation energy. So while the product may be more stable than the reactant, the transition state must be created first and the energy needed to do that is the activation energy.

Question:My science class is doing definitions and we're not aloud to look it up in a dictionary but, what is a 8 grade level definition for energy? (and no not like stuff that makes your lights come on). But I mean like an actual definion!

Answers:A force that produces light and heat I don't know if that's an accurate definition, just thought of it off the top of my head

Question:My text book hasn't got answers. Please explain the following to me. (It's not homework, it is my self-study, and I have just started studying.) 1.Why do atomic spectra suggest that electrons orbit the nucleus in fixed energy levels? 2, Look at the lines below from the atomic spectrum of hydrogen. (I have to explain as I can't copy it here. Increasing energy on the right side. Lines is something like this: From left to right: several lines labelled C. Space and a line labelled *, space and a line labelled A, space and a line labelled B, then space and some close lines on the right.) <------ C---------> * A B * electron falls from n=2 to n = 1 1) What causes the line in the spectrum labelled A? 2) What causes the line in the spectrum labelled B? 3) What causes the series of line in the spectrum labelled C? 3. Extend the diagram to show the next set of lines, and explain. 4. How can atomic spectra provide us with evidence of sub-shells?

Answers:1. Because only specific bright line spectra are emitted which suggests that there are only specific levels that the atom can occupy. If it could occupy any energy level then the spectra would be continuous. N1 has only the 1s orbit N2 has the 2s orbit and the 2p orbits, px py pz The lines are a result of energy released as electron falls from 1 orbit to the next.

From Youtube

A LEVEL CHEMISTRY ON HELIUM :saying chemistry definitions on helium..not as good as it sounds...:S