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Chemical Reactions

By: C4nier. Chemical Reactions. What are Chemical Reactions?. A chemical reaction is when two or more molecules interact and chemical change occurs. What is Happening During a Chemical Reaction. One or more bonds between atoms or molecules are broken and new ones are formed.

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Chemical Reactions

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  1. By: C4nier Chemical Reactions

  2. What are Chemical Reactions? • A chemical reaction is when two or more molecules interact and chemical change occurs.

  3. What is Happening During a Chemical Reaction • One or more bonds between atoms or molecules are broken and new ones are formed. • Bonds are broken by the interaction of electrons with each other. • Whenever there is a chemical reaction energy is involved, either it is being given off or taken in during the process.

  4. Law of Conservation of Mass • This law states that mass is neither created nor destroyed in an ordinary chemical reaction. • Meaning that the mass of the product in a chemical reaction will equal the mass of the reactant. • Ex. 1.00g carbon + 5.34g sulfur =6.34g carbon disulfide

  5. Signs of A Chemical Reaction • There are several ways to indicate that a chemical reaction has occurred. • For example, if a precipitate (solid form in a chemical reaction) is formed then you have a chemical reaction.

  6. Exothermic and Endothermic Reactions • Exothermicreactions release energy such as heat, light or sound. • Endothermic reactions are just the opposite of exothermic reactions. Instead of releasing energy the consume or absorb it. • http://chemed.chem.purdue.edu/demos/movies/large_movies/16.2.mov A thermite reaction using Iron(III) Oxide http://en.wikipedia.org/wiki/Exothermic_reaction

  7. 6 Types of Chemical Reactions • Decomposition • Single Displacement • Double Displacement • Combustion • Synthesis

  8. 1. Decomposition http://cfs.nrcan.gc.ca/images/5947 • Decomposition: When a complex molecule breaks down to make simpler ones. • General form: AB ---> A + B • One example: the electrolysis of water to make oxygen and hydrogen gas. • 2 H2O ---> 2 H2 + O2

  9. 2. Simple Displacement • Single Displacement: When one element trades places with another element in a compound. • General form: A + BC ---> AC + B • One example is when magnesium replaces hydrogen in water to make magnesium hydroxide and hydrogen gas. • Mg + 2 H2O ---> Mg(OH)2 + H2 http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/images/1REPLACE.GIF

  10. 3. Double Displacement http://www.hempfieldarea.k12.pa.us/webdir/MILLERS/sd%20reaction.png • Double Displacement: This is when the cation’s and anions of two different molecules switch places and create two completely different compounds. • General form: AB + CD ---> AD + CB • One example is the reaction of lead (II) nitrate with potassium iodide to form lead (II) iodide and potassium nitrate. • Pb(NO3)2 + 2 KI ---> PbI2 + 2 KNO3

  11. http://wildeboer-fitch.wikispaces.com/Media-+Chemical+Rx 4. Combustion • Combustion:When oxygen forms with another compound to for water or carbon dioxide. • One example of this type of reaction is the burning of napthalene. • (C10H8 + 12 O2 ---> 10 CO2 + 4 H2O)

  12. http://students.ed.uiuc.edu/ljgriffi/project/grifunit3/SYNTHES.GIFhttp://students.ed.uiuc.edu/ljgriffi/project/grifunit3/SYNTHES.GIF 5. Synthesis • Synthesis: When two or more simple compounds form to makes a more complicated ones. • General form: A + B ---> AB • One example is the combination of iron and sulfur to create iron (II) sulfide. • (8 Fe + S8 ---> 8 FeS)

  13. Bibliography • http://www.chem4kids.com/files/reacts_intro.html • http://wiki.answers.com/Q/what_happens_when_a_chemical_reaction_occurs • http://www.harpercollege.edu/tm-ps/chm/100/dgodambe/thedisk/chemrxn/signs.htm • http://misterguch.brinkster.net/6typesofchemicalrxn.html • http://chemistry.about.com/cs/generalchemistry/a/aa051903a.htm • http://www.mi.mun.ca/users/edurnfor/1100/atomic%20structure/tsld004.htm • http://wildeboer-fitch.wikispaces.com/Media-+Chemical+Rx

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