Week 12 Ė Chemical Equations

1) Chemical Formula Shows the number and kids of atoms in a molecule (Ex:  H2O, or C6H12O6)

2) Chemical Equation

A representation of a chemical reaction using formulas.  It shows what is there in the beginning and what it turns into (Ex:  CH4 +2O2       CO2 + 2H2O)

3) Product

A compound or element that is the result of a chemical reaction.  Itís what you end up with on the right side of the equation.

4)  Reactant

Substance(s) that exist before a chemical reaction takes place.  Itís what you start with on the left side of an equation.
5) Yield Sign The arrow in the middle of a chemical equation that shows the direction of the change. It means produces or equals.
6) Coefficient The large number in front of a formula that shows how many of that molecule there are.  It multiplies by the subscript.
7) Subscript A number below and to the right of a symbol, telling how many atoms of that element there are in that molecule.
8) Compound A substance containing two or more different elements which are chemically combined.  It has different properties than the elements itís made of.  
9) Molecule The smallest part of a substance that still have the same properties of that substance.  It is made up of more than one atom.

10) Composition

Refers to the arrangement, type and number of atoms in molecules of chemical substances. 


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