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ETSU - Gen Chem - Class Notes

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ETSU - Gen Chem - Class Notes

School: East Tennessee State University
Department: Chemistry
Course: Gen Chem
Professor: Mohseni
Term: Fall 2016
Tags: elements, elements, compounds, compounds, periodic, periodic, Table, Table, writing, writing, naming, naming, chemical, and chemical
Name: Gen. Chemistry 1110-001 Mohseni
Description: These are notes for Test 1. The answers are in green. These were downloaded from the ETSU D2L website under Chapter 2.
Uploaded: 09/19/2016
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background image 1 Chapter 2 Elements, Compounds, and The Periodic Table Objectives: ­Periodic Table ­Chemical Equations ­Writing and naming chemical compounds Periodic Table: ­The rows in the table are called periods. ­The columns are called groups or families. ­The table is arranged in order of increasing atomic number (# e's, or # p's). ­The elements in a group have the same chemical properties. For example, Li, Na, 
and K react with water and release hydrogen gas.
­Ten elements in the center (Groups IIIB, IIB) are referred to as transition 
elements.
­Elements in Group IA are called alkali metals. ­Elements in Group IIA are called alkali earth metals. ­Elements in Group VIIA are called halogens.
background image 2 ­Elements in Group VIIIA are called noble gases. They are unreactive. Metals, Nonmetals, Metalloids: ­Draw a diagonal line starting to the left of boron. Elements on the left side are 
metals except for Ge, Sb, and Po.  The elements immediately adjacent to the right 
of the diagonal are metalloids.  Ge, Sb, and Po are metalloids as well. The rest are 
considered nonmetals.
Problem: Classify the following elements as metals ( M ), nonmetals( NM ),  metalloids( ML ): Kr NM Po ML Zn M Al M Te ML C NM Ca M Molecules and Ions: ­A molecule is formed when two or more atoms combine. Problem: How many different kinds of atoms are there in one molecule of water?  2
background image 3 ­A molecule is a definite group of atoms that are chemically bonded together. ­The atoms are held by strong force of covalent bonds in a molecule. ­The atoms forming molecule are usually nonmetals. Ex: H­I is a molecule formed from hydrogen (H) and iodine (I) atoms. The dashed 
line between the two atoms refers to a covalent bond. 
­Note that some elements exist in the form of molecules. ­Note that all elements ending in –gen and all elements ending in –ine form 
diatomic molecules. 
Ions: ­An ion is an electrically charged particle obtained from an atom or molecule by 
adding or removing e’s. 
­The atoms are capable of losing or gaining electrons. When one or more 
electron(s) are lost or gained, an ion is formed.
­The ions always carry charges. ­The charge on the ion is written as the superscript following the symbol for that 
element. Calcium (Ca) with an atomic number of 20 has 
20  electrons,  20  protons,  and  20  neutrons. 
background image 4 Ca 20 e 20 x ( ­1 ) =  ­20 20 p 20 x ( +1 )=  +20 So the total charge is ( +20  ­20 ) = 0 Problem: What is the charge of Ca ion when losses two electrons? +2 Problem: Write down the ionic symbol for the following cases: Chlorine gaining one electron. Cl ­ barium losing two electrons. Ba +2 oxygen gaining two electrons. O iron losing two electrons. Fe 2+ iron losing three electrons .

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School: East Tennessee State University
Department: Chemistry
Course: Gen Chem
Professor: Mohseni
Term: Fall 2016
Tags: elements, elements, compounds, compounds, periodic, periodic, Table, Table, writing, writing, naming, naming, chemical, and chemical
Name: Gen. Chemistry 1110-001 Mohseni
Description: These are notes for Test 1. The answers are in green. These were downloaded from the ETSU D2L website under Chapter 2.
Uploaded: 09/19/2016
17 Pages 55 Views 44 Unlocks
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