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Chem 100 week 2

by: Martha Fernandez

Chem 100 week 2 Chem 100

Martha Fernandez
Long Beach State

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Atoms, Matter, Energy oh my! This week we covered the Atom and its properties
Chem 100
Tom Gufrey
Class Notes
#Chem100Notes #Atoms #CSULB
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This 2 page Class Notes was uploaded by Martha Fernandez on Wednesday February 3, 2016. The Class Notes belongs to Chem 100 at California State University Long Beach taught by Tom Gufrey in Spring 2016. Since its upload, it has received 25 views. For similar materials see Chem 100 in Chemistry at California State University Long Beach.


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Date Created: 02/03/16
Scientific Model: uses tangible items to represent invisible processes. Variable: something that can change over course of experiment  Nuclear magnetic  major tool to determine molecular structure  resonance: Matter: anything that occupies space + has mass  Mass: measure of the quantity of matter that an object contains Ex: cannonball > mass than a tennis ball Weight: measure of force between the planet and mass in question Physical property: color, odor, hardness; physical characteristic/ or behavior Chemical Property: describes how the substance reacts with other types of  matter;                                        changes of atomic building blocks  ALL MATTER                                                                                      Substances Elements   compounds Homogenous  Heterogeneou s  Mixtures Density: Quantity of mass in a substance  Energy: Ability to change matter physically or  chemically. ­ Heat: energy moving from cooler to        What describes Energy? warmer  Cold: energy moving from warmer to  cooler  How is it measured? ­ Temperature in degrees  Substance: a form of pure matter: fixed composition  Mixture: NOT A CHEMICAL CHANGE! simply a  mix of 2 or more subtances Ex: oil and water   Types are homogeneous +  heterogeneous   Commonly referred to as  “solutions” Atom: 1 single particle that makes up an element.  VS Molecule: multiple atoms I. Atoms  a. Within the atoms =Protons, Neutrons, and electrons (3 particles or  Subatomic) b. The atomic number indicates the number of Protons in an atom i. ***The atomic number indicates the single Element/ If you change the number of protons, you change the Element c. Atomic Mass Numner is the sum of protons and neutrons in the atom d. Ions: charged atom  i. Charges of an Ion can be Positive or Negative  1. Positive charges are called CATIONS  a. (a way to remember is to see the word as ca+ ions   the“t” as a plus and therefore positive  charge) b. number of protons > number of electrons 2. Negative charges are called ANIONS a. Number of electrons > number of protons e. Isotopes:  two or more atoms of the same element that have an equal  amount of Protons (bc the number of protons determines the element…  cant change) and 1 or more Neutrons   f. Neutral Atoms = charge of 0


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