Classification+of+Matter

__**Directions:**__ a) list and define all vocabulary from the chapter b) type at least 4 sample problems with step-by-step directions of how to solve the problem; list the correct answers (if your chapter doesn't have math, there are still problems and concepts we learned.) c) link at least 3 websites for additional resources to help with studying d) develop your own LEQ questions for the section - what did you think were the key points we learned? e) Once your page is done, visit 4 other chapters and answer their LEQ's. (This can be done on a separate piece of paper.)

A) Vocab __Atomic number :__ Equals the number of protons in the nucleus of each of its atoms. __Mass number:__ The total number of protons and neutrons in the nucleus of an atom. __Atomic symbol:__ The nuclear mass and charge. __Atomic mass:__ The atomic weight of an element. __Law of Mass Conservation:__ The total mass of substances does not change during a chemical reaction. __Law of Definite Composition:__ A particular compound is composed of the same elements in the same parts (fractions) by mass. __Fraction by Mass:__ Part of the compounds mass contributed by the element. __Percent by Mass:__ The fraction by mass expressed as a percentage. __Law of Multiple Proportions;__ If elements A and B react to form two compounds the different masses of B that combine with a fixed mass of A can be expressed as a ratio of a small whole number. __Atoms:__ Tiny individual particles of an element that can not be created or destroyed. __Cathode Ray:__ A "ray" could be seen striking the phosphor- coated end of the tube and emitting a glow spot of light. __Protons:__ Positive charge. __Neutrons :__ Neutral charge __Electrons:__ Negative charge. __Homogeneous :__ Composed of parts or elements of the same kind. __Heterogeneous__ : Diverse in character of content. __Element :__ A substance that contains only one type of atom. __Compound:__ Composed of more than one atom of different elements.

__People :__

__Dalton:__ Dalton's Atomic Theory : matter has a specific, particular mass.

__J.J Thompson:__ Found out how to calculate the mass of atom, thus finding a way to get the weight of atoms in elements.

__Millikan:__ Proved by minimum charge of electrons, you calculate an extremely small mass.

__Rutherford:__ Discovery of the atomic nucleus. found that atoms can be protons, neutrons, and electrons.

__Chadwick:__ Discovered neutrons.

__Bohr:__ Understood atomic structure and quantum mechanics.

B) When determining the difference between homogeneous and heterogeneous solutions, a homogeneous solution is composed of parts or elements all of the same kind. Ex ; A glass of orange juice, brewed tea or coffee, blood. A heterogeneous mixture is a mixture that is diverse in character of content. Ex : Sandy water, chicken noodle soup, oil and water, etc.

When determining the difference between an element and compound, an element is a substance that contains only one type of atom. Ex : Gold, silver, magnesium, etc. A compound is composed of more than one atom of different elements. Ex : Carbon monoxide (CO), Carbon dioxide (CO2), Table salt (NACI), etc.

 C) __Websites__ http://www.chemprofessor.com/atomic.htm http://chemistry.about.com/od/chemistryterminology/a/Heterogeneous-Vs-Homogeneous.htm http://chemed.chem.purdue.edu/genchem/topicreview/bp/ch2/mixframe.html

D) __LEQ:__ What are the types of classification of matter? How do you determine an element from a compound? How do you determine a homogeneous solution from a heterogeneous solution?