RedOx Reactions

Blog Post #5

(December 09, 2015)

A while back, we lectured on equations that had to do with the transfer of electrons, or RedOx reactions.

In these types of reactions, electrons are transferred from metal to non-metal.

If a species loses electrons, it is said to be oxidized, or the reducing agent.

If it happens to gain electrons, then it is said to be reduced, or the oxidizing agent.

Different types of RedOx reactions:

Single Replacement: During this equation, one element replaces another element in a compound.

https://upload.wikimedia.org/wikipedia/commons/3/38/Single_displacement_reaction_example.png

If you need extra help in Single Replacement:
ChemTeam-Single Replacement


Synthesis: In this reaction, two or more chemical elements combine to form a compound.

http://www.ducksters.com/science/chemistry/chemical_reaction_synthesis.gif
Extra Help: ChemTeam-Synthesis

Decomposition: One or more compounds split apart to form elements, or possibly just simpler compounds.

https://userscontent2.emaze.com/images/1d7fe232-af43-43ae-ba9c-90044139592d/5ff24d45-4ffd-415d-812d-72c7c8721e86image5.gif
Extra Help:ChemTeam-Decomposition

Combustion: The reaction of oxygen gas (O2) with anything to form products Carbon Dioxide (CO2) and Water (H2O).

https://upload.wikimedia.org/wikipedia/commons/7/7c/Combustion_reaction_of_methane.jpg
Extra Help: ChemTeam-Combustion

Acid-Base Reactions.

Blog Post #4

(December 02, 2015)

Any reaction that forms water and produces a salt is classified as an Acid-Base Reaction.

The driving force in this reaction would be the production of water (H2O).

To tell if it is a salt, there would be the cation of the base, and the anion of the acid.

Examples of Salts formed from Acid Base reactions.
http://image.slidesharecdn.com/k3evtossqngpfis82zz1-signature-f443b4bd2a7073069896c9d7b0935c806c02e7ae41a8e52ef4a5f6d1fb3e556a-poli-150327220454-conversion-gate01/95/c10-acids-bases-and-salts-32-638.jpg?cb=1427521465

When working with Acid-Base reactions, there are rules for strong acids/bases and weak acids/bases.

                                         STRONG ACIDS                                             

                                            Produce H+ Ions                                               

                                        Pronate Completely                                          

                               HCl, HBr, HI = Strong monoprotic                                

                

                                                   STRONG BASES                                                       Contain OH Anion

                                                      Disassociate completely                    
                                                   Group 1&2 metals + OH anion            

                                                           WEAK ACIDS                                                   

                                                   Do not pronate completely
                                                    
                                                         WEAK BASES

                                              Do not disassociate completely

http://wps.prenhall.com/wps/media/objects/4677/4789905/images/aabjuva0.jpg

Example of an Acid Base Reaction
http://lrs.ed.uiuc.edu/students/mihyewon/images/HClNaOH.gif

Useful Links:

Acid-Base Reactions in Solutions

Double Replacement Reactions

Blog Post #3

(November 30, 2015)

A double replacement reaction is when two compounds react with the cations and anions switching places, ultimately forming two new products.

https://d2gne97vdumgn3.cloudfront.net/api/file/Hfogvl5S6CsOnSsZVqkM

The driving force in a double replacement will always be the formation of a solid. If a solid does not form, then there is no reaction occurring. 

How would you know if it is supposed to react? 

the solubility rules.
https://45.media.tumblr.com/tumblr_ly36p9y1NI1r0vb3to1_500.gif

Helpful Links:

Reaction Types: Double Replacement
(This link provides helpful information on how to solve DR reactions!)

Chemistry Lesson: Double Displacement Reactions

Crash Course: Precipitation Reactions

Types of Chemical Reactions

Blog Post #2

(November 23, 2015)

There are many different types of chemical reactions that all have to do with the with the different driving forces that are produced.

Different types of reactions:

(Will go into more detail in later blog posts)

Combustion: Always reacts with oxygen. The combustion of a hydrocarbon always produces CO2 + H2O.

Double Replacement: The driving force is the formation of a solid. (Precipitate) 

http://study.com/cimages/multimages/16/double_displacement_reaction.png

Synthesis, Decomposition, Single Replacement: The driving force is the transfer of electrons.
Single Replacement: The driving force is the formation of a gas.

http://study.com/cimages/multimages/16/singledisplacementreaction.png

Useful Links:

Major Types of Chemical Reactions

Types of Chemical Reactions--Goes into how to solve the equations

Chemical Reactions

Blog Post #1

(November 22, 2015)

This week, we started a new unit, chemical reactions. In chemical reactions,sensory clues a change has taken place. 

There are 4 different ways in determining a change has taken place:

Gives the four conclusions and describes exo and endo reactions as well.
http://images.slideplayer.com/7/1663161/slides/slide_33.jpg

Anatomy of a chemical equation: 
Left: Reactants
Right: Products
-->: Yield

http://images.slideplayer.com/1/273858/slides/slide_4.jpg

Subscripts & Coefficients
Subscripts: tell the number of atoms in each element
Coefficients: tell the number of molecules

Other key terms
Delta H: Change in heat.
(H-: Exo; H+: Endo)
AQ: Aqueous (dissolved in water.)
Precipitate: A solid form of a solution.

Examples of Chemical Reactions: 
Methane reacts with gaseous oxygen to form gaseous carbon dioxide and water.
- CH4 + O2(g) --> CO2(g) + H2O
(Remember we need lowest whole number ratio, and the equations have to be balanced on both sides)
-CH4 + 2O2(g) --> CO2(g) + 2H2O

Useful Links to help practice with:

Introduction to Balancing Chemical Equations

Balancing Chemical Equations-Khan Academy

A Beginner's Guide to Balancing Equations