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QuestionAnswer
In a chemical reaction one or more substance (called the__) change into one o more new substances (called the __) Reactants; Products
Skeleton Equation Does not indicate the relative amounts of the reactants and products
Aqueous Solutions ex. Usually dissolved in water; ex. Acids
Precipitate Solid Product that forms in an aqueous solution reaction
Evidence of a chemical reactions ex. Oder, Heat, Sound, Light, Gas emission, Change of color
How can you tell if a reaction has occured? If the chemical properties of the reactants and products are different.
What must happen for a reaction to occur? Theory? The particles must collide with sufficient energy; Collision Theory.
What is Activation Energy? The energy needed to start a reaction
What type of reaction absorbs energy? Endothermic Reaction
What type of reaction releases energy? Exothermic Reaction
What is a substance that speeds up the reaction, but is not used up in the reaction? Catalysts
What is a catalyst? How is it written? It is neither a reactant nor a product Its formula is written above the arrow in a chemical equation.
What does a catalyst lower? Activation Energy
In a reaction atoms are rearranged but what is conserved? Mass, Energy, Charge
What is the Law of Conservation of Mass? - in any physical change or chemical reaction, mass is conserved; mass can neither be created nor destroyed - Same # of atoms of each type on each side of the equation.
What happens in a synthesis Reaction? a chemical change in which two or more substances react to form a single new substance.
A+B --> AB Syntheisis
What happens in a decomposition reaction? A chemical change in which a single compound breaks down into two or more simpler products.
AB --> A+B Decomposition
What happens in a single replacement reaction? a chemical change in which one element replaces a second element in a compound
AB + C -> AC+ B single replacement
What happens in a Double replacement reaction? is a chemical change involving an exchange of positive ions between two compounds.
Where do Double Replacement Reactions take place? What does it produce? In an aqueous solution Precipitate, Gas, or molecular compound (water)
AB + CD -> BC +AD Double Displacement
What happens in a Combustion reaction? a chemical change in which an element or compound reacts with oxygen often producing energy in the form of heat and light.
What is often the other reactant in a combustion reaction? Hydrocarbon
What is a complete combustion? a hydrocarbon reacts with oxygen gas to form carbon dioxide and water vapor
What is incomplete combustion? a hydrocarbon reacts with oxygen gas to form carbon monoxide and water vapor (not enough oxygen present)
CH4 + O2 -> CO2 + 2H2O Complete Combusion
CH4 + O2 -> CO + 2H2O Incomplete Combusion
Spectator ions? Are not involved in the chemical reaction
Net Ionic Equation? only shows those particles that are directly involved in the chemical change and is balanced with respect to both mass and charge
Created by: mmd0101
 

 



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