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chemistry (equations (Ch4+O2=CO2+H2O (Ch4=2O2=CO2+2H20), sodium chloride,…
chemistry
equations
sodium chloride
NA
CL
Na+Cl=NaCL
Ch4+O2=CO2+H2O
Ch4=2O2=CO2+2H20
atomic structure
nucleus
protons : has a postive charge
neutrons : postive charge
shells
electrons : neutral charge
small - mass = 1dived by 2000
mass number is the mass of atoms and also the number of protons and neutrons
physical and chemical changes
physical change : is reversible
chemical change : is not easily reversible
bonding
ionic bonding
will be attracted together
Na will give an electrons to Cl which will make NaCl
is the postive and negative charge
covalent bounding
sharing electrons
h and o will join together
electrons shell
number of electrons per shell
2,8,8,8 in the shells
atoms
1 particle of one element
molecules
more that one atom joined together
element
is a basic building box in the periodic table
compound
more than one element chemically joined together
mixture
more that one type of particle , not chemically joined