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Ch. 8 Reactions

A substance that enters into a chemical reaction . Always on the left side of the arrow. reactant
A substance that is produced by a chemical reaction. Always on the right side of the arrow. product
Expression in which symbols, formulas, and numbers are used to represent a chemical reaction. chemical equation
The observation that mass remains constant in a chemical reaction. law of conservation of mass
Two or more simple substances combine to form a new complex substance. synthesis reaction
A complex substance breaks down into two or more simpler substances. decomposition reaction
An uncombined element replaces an element that is part of a compound. single replacement reaction
Different atoms in two different compounds replace each other. double replacement reaction
A chemical reaction in which energy is released. exothermic
A chemical reaction in which energy is absorbed. endothermic
Energy required to start a reaction. activation energy
The study of reaction rates. kinetics
Measure of how quickly reactants turn in products. reaction rate
Relates collisions among particles to reaction rate. Reaction rate depends on such factors as concentration, surface area, temperature, and catalysts. collision theory
Refers to how much of the material is exposed surface area
Increases the rate of a reaction, but does not change itself. catalyst
The number placed in front of the symbol or formula in a chemical equation that indicates the number of atoms or molecules involved in the reaction. This is used to balance an equation. coefficient
Number placed in the lower right of the chemical symbol to indicate the number of atoms of the element in the compound. subscript
Combining of atoms and electrons to form new substances. This happens when electrons are gained, lost, or shared. chemical Bond
Process in which substances undergo physical and chemical changes that result in a new substance with different properties. chemical reaction
Gas that reignites oxygen
Gas that makes a popping noise when a flame is held near it hydrogen
Range of the ph scale 0-14
Neutral number on the ph scale 7
0-6 on the ph scale acid
8-14 on the ph scale base
Range when phenolphthalein turns pink 8-10
Variable in Ammonium Nitrate lab NaCl
Example of an indicator we have used phenolphthalein
Example of an acid we used hydrochloric
Example of a base we used sodium hydroxide
If red litmus paper turns blue, then the solution is a base
If blue litmus paper turns red, then the solution is an acid
Created by: tthomps



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