Chemical Equation Study Guide
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Chemical Equations Study Guide Molecules are made of atoms that have been joined together. There are two types of molecules: o Elements (H 2 ) o Compound (NaCl) An element is when two or more of the same atoms join together. o Example: O 2 (the oxygen we breath) is made out of two oxygen atoms. A Compound is a combination of two or more different elements (atoms). o Example: 1 Na (sodium) atom + 1 Cl (Chlorine) atom = the compound NaCl The example above is a compound because the molecule is made out of different atoms. The subscript in the below example shows that in O 2 there are 2 oxygen atoms. The coefficient in 2H 2 O shows that there are 2 H 2 O water molecules.
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Study Guide
Transcript of Chemical Equation Study Guide
Chemical Equations Study Guide
Molecules are made of atoms that have been joined together.
There are two types of molecules:o Elements (H2)o Compound (NaCl)
An element is when two or more of the same atoms join together.
o Example: O2 (the oxygen we breath) is made out of two oxygen atoms.
A Compound is a combination of two or more different elements (atoms).
o Example: 1 Na (sodium) atom + 1 Cl (Chlorine) atom = the compound NaCl
The example above is a compound because the molecule is made out of different atoms.
The subscript in the below example shows that in O2 there are 2 oxygen atoms.
The coefficient in 2H2O shows that there are 2 H2O water molecules.
The 3 particles found in an atom are the proton, electron, and neutron.
Protons have a positive charge and are found inside the nucleus.
Electrons have a negative charge and are found outside the nucleus.
Neutrons have no (zero) charge and are found inside the nucleus.
The atomic mass is made up of the mass of both the proton and neutron.
The first energy level can only hold 2 electrons.
The second energy level can only hold 8 electrons.
The third energy level can only hold 8 electrons.
