Chemistry Unit 3 Review

Henery Never Opens Fish Cans Because Icky

Diatomic Molecules:

Hydrogen

Nitrogen

Oxygen

Flourine

Chlorine

Bromine

Iodine

How to find precent composition:

Add together all molar masses of each element, divide each element’s individual molar mass over the total mass, multiply each by 100 to find a %

How to find percent yeild:

divide average yeild over theoretical yeild and multiply by 100

solid forms

percipitate

clues that a chemical reaction has occured

* A color changes
* A solid forms
* Bubbles form
* Heat and/or a flame is produced, or heat is absorbed

Synthesis

two or more substances combine to form a new compound

Decomposition

a single compound undergoes a reaction that produces two or \n more simpler substances

Single Displacement Reaction

one element replaces a similar element in a compound

Double Displacement Reaction

the ions of two compounds exchange places in an aqueous \n solution to form new compounds

Combustion

a substance combines with oxygen releasing large amounts \n of energy in the form of light and heat (look for the \n production of CO 2 and H 2 O)