Textbook Notes (368,098)
United States (205,941)
Boston College (1,174)
Chemistry (6)
CHEM 1161 (2)
Schlegel (1)
Chapter 5

Chapter 5 notes.docx

10 Pages
102 Views
Unlock Document

Department
Chemistry
Course
CHEM 1161
Professor
Schlegel
Semester
Fall

Description
Chapter 5  09/25/2012 5.3 Chemical Reactions and Equations Chemical Change   A chemical change  occurs when a substance is converted into one or more substances with different formulas and different  properties may be observed by the formation of bubbles, a change in color, or production of a solid Balanced Equation not atoms are lost or gained number of reacting atoms is equal to number of product atoms  EX: Fe3O4(s)+H2(g)­▯Fe(s)+H2O(l) Fe3O4(s)+4H2(g)­▯3Fe(s)+4H2O(l) Polyatomic: __Fe2O3s       __s( )         s __Fe( )  2+g  __CO ( )       1) 2, 3, 2, 3          2)  2, 3, 4, 3        3)  1, 1, 2, 3   5.4 Types of Reactions Combination Reactions Two or more elements combine to form one product  Or simple compounds combine to form one product  EX: 2Mg(s)  + 2Og( )           s 2MgO( ) Decomposition Reactions One substance splits into two or more simpler substances  EX: 2HgO(s)       2Hl( )   2g O ( ) Single Replacement Reactions One element takes the place of a different element in another reacting a compound  EX: Fe s )   + CuS4aq ) ▯ eSO 4 aq) +  Cus ) Double Replacement Reactions  Two elements in the reaction replace each other EX: AgNO (3 aq )  + NaClaq )   ▯   AgCs(   + NaNO3(aq )   Combustion Reaction Carbon containing compound burns in O2(g) Products are carbon dioxide are water  Energy is released as a product in the form of heat  CH 4 g + 2O 2 g    ▯       2Og( ) + 2H Og ) + energy 5.5 Oxidation­Reduction reactions  An oxidation–reduction reaction  provides us with energy from food provides electrical energy in batteries occurs when iron rusts: 4Fe(s) + 3O 2g)           2Fe3s ( ) electrons are transferred from one substance to another  oxidation­loss of electrons (oxidized) reduction­gain of electrons (reduced) oxidizing agent­ agent that it causing the oxidation to happen (electron acceptor) reducing agent­ electron donor, causes reduction to occur  2Cu( s + O 2 g        ­▯        2CuO OIL RIG Oxidation is loss of electrons.    2Cu(s)          ­▯    (s)+ 4 e− Reduction is gain of electrons. −        ­▯  2−               O2g ) + e 2O ( s Oxidation­Reduction in Biological Systems  The oxidation of a typical biochemical molecule can involve the transfer of two hydrogen atoms (or 2H  and  + − e ) to a proton acceptor such as the coenzyme FAD (flavinadenine dinucleotide). Methyl alcohol     ▯         formaldehyde   Oxidation (loss of H as hydrogen gas) CH OH       ­▯            H CO + 2H 3 2 2 Formaldehyde        ▯         formic acid 2H C2 + O    2   ▯          2H 2O  O2     on (addition of O) Oxygen is oxidizing agent because it is being reduced  2H 2O is being oxidized so it is reducing agent  5.6 Mole Relationships in Chemical Quantities 
More Less

Related notes for CHEM 1161

Log In


OR

Join OneClass

Access over 10 million pages of study
documents for 1.3 million courses.

Sign up

Join to view


OR

By registering, I agree to the Terms and Privacy Policies
Already have an account?
Just a few more details

So we can recommend you notes for your school.

Reset Password

Please enter below the email address you registered with and we will send you a link to reset your password.

Add your courses

Get notes from the top students in your class.


Submit