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Chemical Reactions

Chemical Reactions. By cookiesrule. The Basics!. http://en.wikipedia.org/wiki/Image:Hydrochloric_acid_ammonia.jpg. Reactants and Products. In a reaction, the substances used up are called the reactants. The substance that is then created is called the product.

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Chemical Reactions

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  1. Chemical Reactions By cookiesrule

  2. The Basics! http://en.wikipedia.org/wiki/Image:Hydrochloric_acid_ammonia.jpg

  3. Reactants and Products In a reaction, the substances used up are called the reactants. The substance that is then created is called the product. For example when iron reacts with sulfur, iron sulfide is formed. Iron and sulfur are the reactants and iron sulfide is the product. http://www.nelsonthornes.com/secondary/science/scinet/scinet/reaction/change/reactant.htm

  4. What’s happening? • Every type of chemical reaction differs in the exact product. Yet in simplest terms, bonds are broken and formed by the interaction of electrons. http://wiki.answers.com/Q/What_happens_when_a_chemical_reaction_occurs http://www2.nl.edu/jste/bonds.htm

  5. The law of conservation of mass According to the law of conservation of mass, in a chemical reaction, matter cant be destroyed or created. In simpler terms, the mass of a product is always equal to the mass of reactants. http://en.wikipedia.org/wiki/Conservation_of_mass

  6. Five signs of a chemical reaction. • Change of color • Formation of gas • Formation of precipitate. • Change in temperature. • A type of energy is produced. http://answers.yahoo.com/question/index?qid=20081109193239AAsxvbW

  7. Energy and Chemical Reactions The role of energy in chemical reactions. http://en.wikipedia.org/wiki/Potential_energy

  8. Chemical potential Energy • Chemical energy is a form of potential energy in relation to the structure of an atom. The energy of a chemical substance can be altered to other forms of energy by a chemical reaction. • For example, when fuel is burning, the energy is transformed into heat.http://en.wikipedia.org/wiki/Potential_energy

  9. Exothermic • In an exothermic reaction, energy is released as heat, light or sound. • An Example of an Exothermic reaction is the combustion of fuels. Endothermic • In an endothermic reaction, it must absorb as much energy as possible to be successful. These reactions do not occur spontaneously. When endothermic reactions take place, you record the drop in temperature. • An example of an endothermic reaction would simply be melting Ice cubes. http://chemistry.about.com/cs/generalchemistry/a/aa051903a.htm

  10. Activation energy • Activation energy is the minimum amount of energy a reaction requires to occur. http://www.bio-medicine.org/biology-definition/Activation_energy/

  11. Types of Reactions Synthesis Decomposition Single Replacement Double Replacement Combustion http://www.usoe.k12.ut.us/curr/science/sciber00/8th/matter/sciber/chemtype.htm

  12. Synthesis In a synthesis reaction, two or more simple substances combine to form a larger and more complex substance. 2 reactants yield one substance. For example, when hydrogen combines with oxygen, they produce a more complex substance (water) 2H2 + O2  2H2O www.amgmedia.com/freephotos/free-photos-3.html

  13. Decomposition • In a decomposition reaction, a complex substance breaks down into two simple substances. • While looking at a formula, you can see that one reactant produces two products. • For example, water breaks down into hydrogen and oxygen gas.2H2O  2H2 + O2 http://www.chanceandchoice.com/ChanceandChoice/waterstructure.jpg

  14. Single Replacement • In a single replacement reaction, a single element replaces another in a compound. • In this type of reaction, you can see that 2 reactants yield two products. • For example, when zinc reacts with hydrochloric acid, zinc replaces the hydrogen.Zn +2HCl  ZnCl2 +H2 http://z.about.com/d/chemistry/1/0/y/c/hydrochloricacid.jpg

  15. Double Replacement • In this reaction, both parts of two compounds switch to form two new compounds. • You will see that two reactants yield two products. • For example, when silver nitrate reacts with sodium chloride, they switch places to produce silver chloride and sodium nitrate. http://www.germes-online.com/direct/dbimage/50146855/Prilled_Sodium_Nitrate.jpg http://www.saltlakemetals.com/images/SilverChloride500.png

  16. Combustion • In this reaction all substances in a compound are combined with oxygen, which then produces carbon dioxide and water. • It is an exothermic reaction, and therefore produced heat. • CxHy + O2  CO2 + H2O • http://en.wikipedia.org/wiki/Combustion blog.wired.com/.../2007/10/nbc-plans-femal.html Remove frame

  17. http://web.syr.edu/~gavan/bugs.jpgThat’s all Folks! This presentation has been brought to you by cookiesrule

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