By katie_lee_123

What part of an atom does chemical reactions affect?Chemical reactions only interfere with the electrons, (negatively charged particles of an atom that is always located on the outer layer of an atom) in an atom.http://en.wikipedia.org/wiki/Chemical_reactions

http://www.chem4kids.com/files/atom_electron.html

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What is happening during a chemical Rx?

During a chemical Rx (chemical reaction) a substance or substances change into one or more new substance (s). Also one or more bonds between atoms or molecules are broken or new ones are produced. The substance or substances that are originally in the chemical mixture are called reactants. The substance or substances that are noticeable after the combined chemicals are called products. http://www.answers.com/topic/chemical-reaction

http://en.wikipedia.org/wiki/Chemical_reaction

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Law of conservation of mass.The law of conservation of mass relates to chemical reactions because mass is conserved during a chemical reaction. In more depth, the total mass of the reactants in the chemical reaction is the same as the mass of the products in the chemical mixture.http://www.visionlearning.com/library/module_viewer.php?mid=56 http://www.saskschools.ca/curr_content/science10/unitb/lawmass.html http://hyperphysics.phy-astr.gsu.edu/hbase/chemical/im

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Signs of chemical reactions.

•Bubbles of gas appear• A solid precipitates down to the bottom of the container when reactants are mixed into a solution (a precipitate forms)• The color of the chemical (s) change•The temperature changes either increasing or decreasing•The mixture gives off light•Sometimes electricity occurs•The melting/boiling point changes•The smell of the reaction changes•The taste (if you can eat/drink it) changeshttp://antoine.frostburg.edu/chem/senese/101/reactions/symptoms.shtml

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Energy and chemical reactions.

During a chemical reaction, energy is either released or taken in. Reactions that give off energy are exothermic and the temperature increases. Some examples of exo reactions are candle flame and making ice cubes. Reactions that take in energy are endothermic and the temperature is decreased. Some examples of endo reactions are melting ice cubes and evaporating liquid water.

http://www.fordhamprep.com/gcurran/sho/sho/lessons/lesson16.htm

http://chemistry.about.com/od/lecturenotesl3/a/endorxns.htm

http://antoine.frostburg.edu/chem/senese/101/thermo/faq/exothermic-endothermic-examples.shtml

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Extra information on energy and chemical reactions.

Activation energy, also known as midnight energy is the energy that must acquire in order for a chemical reaction to occur. One example of activation energy is rolling a ball down a hill to collide with another ball. Chemical potential energy is stored within a physical system. In an easier definition, chemical potential energy is energy stored in the bonds of atoms and molecules, and holds particles together. This specific energy is called potential because it has the potential to be categorized as other types of energy. Some examples of chemical potential energy is natural gas and propane.

http://en.wikipedia.org/wiki/Activation_energy

http://en.wikipedia.org/wiki/Potential_energy

http://www.eia.doe.gov/kids/energyfacts/science/formsofenergy.html

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Synthesis chemical reactions

Synthesis is when two or more substances are combined and produce one substances. You can realize it is a synthesis reaction if the following formula is involved. A + B --> AB An example of synthesis chemical reactions is when simple hydrogen gas is combined with simple oxygen gas, they produce water.

http://library.thinkquest.org/2923/react2.html#synth

http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/sciber/chemtype.htm

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Decomposition chemical reactions.

Decomposition is when a compound is broken down. You can realize it is a decomposition reaction if the following formula is involved. AB --> A + B An example of decomposition chemical reaction is when calcium carbonate (sea shells, chalk, etc.) are burned.http://library.thinkquest.org/2923/react2.html#synth

http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/sciber/chemtype.htm

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Combustion chemical reactions.

Combustion is when all substances in a compound are combined with oxygen. You can realize it is a combustion reaction if the following formula follows the certain experiment. CxHy + O2 --> CO2 + H2O An example of combustion chemical reaction is when wood burns, it must burn in the presence of O2 and a lot of heat is produced.http://library.thinkquest.org/2923/react2.html#synth

http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/sciber/chemtype.htm

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Single replacement.

A single replacement reaction is when a metal replaces a metal or a nonmetal replaces a nonmetal. You can notice that a reaction is a single replacement if the following formula follows. A + BC --> AC + B An example is when zinc combines with hydrochloric acid, the zinc replaces hydrogen.http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/sciber/chemtype.htm

http://library.thinkquest.org/2923/react2.html#synth

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Double replacement.

A double replacement is when a metal replaces a metal or a nonmetal replaces a nonmetal. You can determine if it is a double replacement if the following formula follows the experiment. AB + XY --> AY + XB An example is when silver nitrate combines with sodium chloride, two new compounds, silver chloride and sodium nitrate are formed because the sodium and silver switched places.http://library.thinkquest.org/2923/react2.html#synth

http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/sciber/chemtype.htm

http://www.dartmouth.edu/~chemlab/chem3-5/qual_cat/

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