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General Chemistry II

by: Elizabeth Hunter

General Chemistry II CHEM:1080

Marketplace > University of Iowa > Chemistry > CHEM:1080 > General Chemistry II
Elizabeth Hunter
GPA 3.8
General Chemistry II
Yakov Letuchy

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This is notes from our first week of lecture!
General Chemistry II
Yakov Letuchy
Class Notes
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This 3 page Class Notes was uploaded by Elizabeth Hunter on Sunday January 25, 2015. The Class Notes belongs to CHEM:1080 at University of Iowa taught by Yakov Letuchy in Winter2015. Since its upload, it has received 145 views. For similar materials see General Chemistry II in Chemistry at University of Iowa.


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Date Created: 01/25/15
Chapter 1 01212015 0 Every measurement is composed of a number and a unit 0 The number is meaningless without the unit Examples 0 Proper aspirin dosage 325 milligrams or pounds 0 A fast time for the 100meter dash 1000 seconds or days A The Metric System 0 Each type of measurement has a base unit in the metric system 0 The pre x of the unit name indicates if the unit is larger or smaller than the base unit B Measuring Length 0 The base unit of length is the meter C Measuring Mass 0 Mass is a measure of the amount of matter in an object 0 Weight is the force that matter feels due to gravity 0 The base unit of mass is the gram D Measuring Volume 0 The base unit of volume is the liter Numbers used in Chemistry are either exact or inexact An exact number results from counting objects or is part of de nition 0 An inexact number results from a measurement or observation and contains some uncertainty 0 Determining the number of Signi cant Figures 0 Signi cant gures are all the digits in a measured number including one estimated digit All nonzero digits are always signi cant A zero counts when it occurs between two nonzero digits OR at the end of a number with a decimal place A zero does not count when it occurs at the beginning of a number OR at the end of a number that does not have a decimal Rules for Multiplications and Division 0 The answer has the same number of signi cant gures as the original number with the fewest signi cant gures Rules for Addition and Subtraction o The answer has the same number of decimal places as the original number with the fewest decimal places For representation of large and small numbers that have many zeroes at the beginning or the end A Elements and the Periodic Table 0 Pure substance that cannot be broken down by chemical reactions into simpler substances 0 Learn to identify element by its symbol and classify it as metal conduct heat and electricity ductile and malleable non metal poor heat and electrical conductivity or metalloid intermediate properties between metals and nonmetals B Compounds 0 Compound a pure substance formed by chemically combining two or more elements together 0 A chemical formula consists of Element symbols to show the identity of the elements forming a compound Subscripts to show the ratio of atoms in the compound 0 Pure substances formed by combining two or more elements together 0 Compounds are represented by formulas that can be drawn by many ways 0 Different elements are represented by different colors in space lling models 0 Seven elements exist in diatomic state H2 02 l2 All matter is composed of the same basic building blocks called atoms Atoms are composed of three subatomic particles Proton 1 Neutron 0 Electron 1 1 amu 1661 x 10quot24g Masses of protons and neutrons are rounded to 1 amu Opposite charges attract while like charges repel each other Protons and electrons attract each other but two electrons or two protons repel each other 0 Atomic number is the number of protons in the nucleus Every atom of an element has the same number of protons in the nucleus 0 Different elements have different atomic numbers 0 Z number of protons number of electrons Periodic table is arranged in order of increasing atomic number not mass number 0 Atomic Number and Mass Number 0 Mass number A the number of protons Z the number of neutrons 0 Elements in the Periodic system are arranged according to atomic number Atoms of the same element have the same number of protons but the number of neutrons can vary 0 lsotopes are atoms of the same elements having different number of neutrons o The atomic weight is the weighted average of the masses of the naturally occurring isotopes of a particular element reported in atomic mass units 24 The Periodic Table


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