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Unit 5 Terms

General Chemistry // Balancing Equations & Reactions

TermDefinition
Evidence of a Chemical Reaction 1. Color Change* 2. Gas Release 3. Heat Change OR Light Release 4. Precipitate has formed
Chemical Reaction The process in which a substance undergos a change into a new substance with new properties
Reactant The _________ is present before the chemical reaction
Product The _________ is what is made as a result of the chemical reaction
Law of Conservation of Matter Matter can neither be destroyed or created, just changed
Coefficients The whole numbers that are written before a chemical symbol
Diatomic Molecules The elements that are never alone in nature. - They come in pairs
HONClBrIF Whenever one of these elements are written by themselves, they automatically receive 2
Metals Activities Series Used to predict whether or not a single replacement reaction will occur
Exothermic The type of reaction in which heat is released
Precipitate The solid that results in a reaction between two colorless solutions
Word Equation The type of reaction in which the names of the chemicals are written out
Catalyst This is used to make a chemical reaction go faster
Endothermic The type of reaction you want if you needed a cold pack
Aqueous When a chemical is dissolved in water, it creates a _______ solution
Steps to Balancing Equations 1. Write the symbols 2. Make a proper formula 3. Count the atoms, make a list 4. Write coefficients
Combination A + B → AB - Two reactants, one product
Decomposition AB → A + B - One reactant, two products
Combustion A + O2 → AO - Reactant + oxygen, one product
Single Replacement AB + X → XB + A - If X is stronger than A, the reaction will occur
Double Displacement / Double Replacement AX + BY → AY + BX - A and B will switch partners, if you will
No Reaction AB + X → NR - If X is not stronger than A, the reaction will not occur
Created by: 584jth02
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