Chemical Reactions By, Olivia Pierson

Table of Contents Chemical Reactions: The Basics Signs of a Chemical Reaction Reactants & Products Law of Conservation of mass Energy & Chemical Reactions Exothermic Reactions Activation Energy Table of Contents

Chemical Reactions: The Basics What part of atoms are affected? -the electrons are affected What is happening during a chemical reaction? -one or more bonds between atoms are either broken or new ones are formed Chemical Reactions: The Basics Information: www.wikianswers.com

Signs of a Chemical Reaction Change in temperature Change in form Change in color Change in scent Signs of a Chemical Reaction Information: www.wikianswers.com

What are Reactants? -reactants are two or more elements that chemically interact to form a new substance. What is a Product? -a product is the result of the experiment, what is produced at the end Reactants & Products Information: www.wikianswers.com

Law of Conservation of Mass Energy cannot be created nor destroyed but it can change forms (solid, liquid, gas, plasma) How it is related to a chemical reaction is the energy is not created nor destroyed but it changes forms, such as going from a solid to a liquid, liquid to gas, or solid to gas, liquid to solid, gas o solid…ect… http://wiki.answers.com/Q/What_is_the_law_of_conservation_of_mass&alreadyAsked=1

Law of Conservation of Mass The Law of Conservation of Mass was discovered by Antoine Laurent Lavoisier in 1785 Image: https://images.google.com/Lavoisier

Energy & Chemical Reactions What is an endothermic reaction? -an endothermic reaction, for example, is when is when you mix two solids called barium hydroxide and ammonium salt. When mixed they dissolve together Into water of hydration, therefore They become very cold. Image: http://genchem.chem.wisc.edu/demonstrations/Movies/endosm.gif

Exothermic Reactions What is an exothermic reaction? -a candle for example When enough heat is applied to a candle it starts to oxidize. The paraffin reacts with the water resulting in carbon dioxide and water, also heat and light. The reaction creates visible light, the flame. Information: http://chemistry.about.com

Chemical Potential Energy What is chemical potential energy? -chemical potential energy is energy which is stored in the chemical bonds of the atoms in a molecule. When the bonds are re-arranged, energy can be released. Chemical Potential Energy Information: http://www.psd70.ab.ca/sgchs/Sc10/potent.html

Activation Energy is the energy needed by a system to initiate a particular process. It is often used to denote the minimum energy needed for a specific chemical reaction to occur. Information: http://www.bio-medicine.org Activation Energy

Synthesis Reactions What is happening in a synthesis reaction? -In a synthesis reaction, two or more substances combine to form another substance -It’s the formation of a complex compound by the combination of two or more simpler compounds, elements, or radicals. http://wiki.answers.com/Q/What_is_a_synthesis_reaction&alreadyAsked=1 Image: http://www.usoe.k12.ut.us/CURR/Science/sciber00/8th/matter/images/SYNTHES.GIF

Decomposition Reactions What is happening in a decomposition reaction? -A decomposition reaction is where one single compound breaks down into two or more simpler chemicals. An example of this is the decomposition of zinc carbonate, represented by the equation: -ZnCO3(s) ZnCO(s) + CO2(g) http://wiki.answers.com/Q/If_heat_must_be_added_to_a_chemical_reaction_for_the_reaction_to_take_place_the_reaction_is&alreadyAsked=1&rtitle=What_is_a_decompostition_reaction Image: www.chemistryexplained.com Decomposition Reactions

Combustion Reactions What is happening in a combustion reaction? -A combustion reaction is a reaction in which a substance reacts with oxygen and heat is released. http://wiki.answers.com/Q/What_is_a_combustion_reaction&alreadyAsked=1 Image: http://www.process-heating.com/PH/2002/08/Files/Images/116295.gif

Single Replacement Reaction A single replacement is when a single uncombined element replaces another in a compound. Two reactants yield two products. For example when zinc combines with hydrochloric acid, the zinc replaces hydrogen. The chemical equation for this single replacement reaction looks like: Zn + 2HCl ---> ZnCl2 + H2 Single Replacement Reaction http://wiki.answers.com/Q/What_is_a_single_replacement_reaction&alreadyAsk

Double Replacement Reactions A double replacement reaction is when two elements switch places in a chemical reaction. An example would be... NaSOU4+PoBNF2=>PoBOU4+NaSNF2 The NaS and the PoB switched places. Double Replacement Reactions http://wiki.answers.com/Q/What_is_a_double_replacement_reaction&alreadyAsked=1

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