Chemistry

Atoms
Atoms are the smallest functional units of matter that make up our universe.
Protons
Positive Charge (+)
Electrons
Negative Charge (-)
Neutrons
Neutral (n) they don’t carry a positive or a negative charge. 
Polyatomic ions

Ions that contain more than one element in them. 

 

Example: OH– (Hydroxide)

Single Displacment Reaction

 AB + C –> A + CB


Example: Zn(OH)2 + 2 Na –> Zn (s) + 2 NaOH

Double Displacment Reaction

AB+CD –> AD+CD


Example: AgNO3 + HCl –> AgCl (s) + HNO3

Precipitation Reaction

AB + C –> A (s) + CB or AB + C –> A + CB (s)

or, AB + CD –> AD + BC (s) or AB + CD –> AD (s) + BC


Example: 3 NaOH + Al –> 3 Na + Al(OH)3 (s)

Combustion

CxHy + O2 –> CO2 + H2O + energy


Example:  CH4 + 2O2 –> CO2 + 2H2O + energy

Acid/Base Reaction

acid+ + base –> salt + water


Example:  H2SO4 + 2 NaOH –> Na2SO4 + 2H2O


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