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Chemistry is the study of matter and the changes 

that take place with that matter. Matter makes up 

everything in the universe and is the name that 

scientists have given to everything you can touch, or 

see, or feel, or smell. 

Atoms are tiny parts that make up everything. There 

are many models of the atom, but Schrodinger's is the 

most recent. 

Atoms are made up of subatomic particles: protons, 

neutrons, and electrons. 

Protons are positively charged particles. 

Neutrons are neutrally charged particles. 

Electrons are negatively charged particles. 

Protons and neutrons are the nucleus, or center, of 

the atom, electrons surround the nucleus in a "cloud". 

Chemical bonding is the joining of atoms to form 

compounds. When chemical bonds form, electrons 

can be given, taken, or shared between the atoms. 

H 

                              H                

                                               O 

One compound is Hydroxic Acid. Hydroxic Acid 

is also known as water. The formula for water 

is H₂O. This means that there is two Hydrogen 

atoms and one Oxygen. 

There are five types of chemical reactions: 

Synthesis = Chemical A +Chemical B > Chemical AB 

Decomposition = Chemical AB > Chemical A + Chemical B 

Single Replacement = Chemical AB + Chemical C > Chemical CB + 

Chemical A 

Double Replacement = Chemical AB + Chemical CD > Chemical AD + 

Chemical CB

Combustion = Carbon&Hydrogen + Oxygen > Carbon Dioxide + Water 

In chemistry, a mole is a unit of 

measurement. 1 mole = 6.02X10²³ 

(602,000,000,000,000,000,000,000) 

representative particles, which are 

elements or atoms. 

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