By: Chris Garney Chemical Reactions

What Part of the Atom Is Affected by Chemical Reaction? Electrons are the negatively charged. This particle is about 1,000 times smaller than the mass of a proton. It is impossible to see where they are at a specific moment due to the speed it moves at. Their chemical bond is Electrovalent, or Ionic. They are the only part in the atom affected by chemical reaction. http://www.chem4kids.com/files/atom_e lectron.html http://web1.caryacademy.org/chemistry/rushin/StudentProjects/ElementWebSites/iodine/electrons.gif

What is happening during a chemical Rx? During a chemical reaction bonds between atoms or molecules are either being broken or formed. For example vinegar and baking soda creates this chemical reaction  The acid in the weak 5% substance (vinegar) reacts with the pure substance (baking soda) Laws of Conservation – Matter can not be created or destroyed. That total mass of products before and after reaction is the same. Signs of Chemical Reaction – bubbling, fizzing, temperature change, color change, catches on fire, etc. Reactants – are the materials that is used for the chemical reaction Products – is the substance(s) made afterwards 1 http://w\iki.answers.com/Q/What_happens_when_a_chemical_reaction_occurs 2 http://www.apple-cider-vinegar-benefits.com/baking-soda-and-vinegar.html 3 http://www.nelsonthornes.com/secondary/science/scinet/scinet/reaction /change/reactant.htm http://images.google.com/imgres?imgurl=http://bp3.blogger.com/_rcYeSOWZ2Yc/RgyexQo8PFI/AAAAAAAAACg/Z-BodVTHc6o/s320/vinegar_soda.jpg&imgrefurl=http://eco-centric.blogspot.com/2007/03/bubble-bubble-toil-and-trouble.html&usg=__7iorSWGYTEvk-y2Ume4WGwKRBAQ=&h=150&w=150&sz=7&hl=en&start=13&um=1&tbnid=blIoyvcmDzu_hM:&tbnh=96&tbnw=96&prev=/images%3Fq%3Dbaking%2Bsoda%2Band%2Bvinegar%2Breaction%26um%3D1%26hl%3Den

Explain the role of energy in chemical reactions. Chemical potential energy is energy that is stored in the bonds of molecules or atom. This energy holds these particles together. Examples: Biomass, Petroleum, Natural gas, and Propane. Activation energy is the energy that is needed to create a chemical reaction Exothermic – reaction gets hot Endothermic- reactions get cold EXOTHERMIC EXAMPLE Gasoline http://home.comcast.net/~manjo1111/BUBF/GasCan.jpg + Fire http://upload.wikimedia.org/wikipedia/commons/1/16/Australia_Cairns_Flame.jpg = EXPLOSION http://express.howstuffworks.com/gif/explosion-intro.jpg

ENDOTHERMIC EXAMPLE Baking soda + Fire http://upload.wikimedia.org/wikipedia/ commons/thumb/c/c1/Streichholz.jpg/250px-Streichholz.jpg = EXTINGUISHED  http://youngadultcrisishotline.files.wordpress.com/2008/05/match- out.jpg

Types of Chemical Rx’s Explain what happens in the different types of reactions Synthesis – is the combination of 2 0r more pre-existing elements. Creating something new. Decomposition – is when a chemical compound is separated into a smaller compound or element  Combustion – or burning is a exothermic reaction produces heat. Can be a flame or just a glow Single Replacement – takes one element with a chemical which results to another element being created. For example putting aluminum in copper chloride creates copper  Double Replacement - when a positive ion or Cation combines with a negative ion or anion. For example barium chloride and sodium sulfate creates a white powder.

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