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Good notes for understanding!Good notes for understanding! it will help in coursework, exam preparation....

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Chemical Formulas

Name: ______________________ Blk:____

Directions: On each line write the name of the elements that are denoted in each of the chemical formulas. Then in the parenthesis, write the number of atoms that can be found in the molecule. Remember, each chemical element begins with a capital letter.

The “subscript” (number below) tells us the number of atoms of a certain element. Example: H2O = There are two Hydrogen (H) atoms and one Oxygen atom. The subscript is always written after the element it applies to and it doesn’t apply to any other elements. Water =H2O = Hydrogen ( 2 ) Oxygen ( 1 ) 1.

Fe3O4 = _______Iron____________ ( 3 )

______Oxygen________( 4 )

2.

Salt =NaCl =___Sodium______ (

)

_______________ (

3.

NH4

=_______________ (

)_______________ (

4.

AgNO3

=_____________ (

)_____________ (

)_______________ (

)

5.

NH4Cl

=_____________ (

)_____________ (

)_______________ (

)

6.

CoCO3

=_____________ (

)_____________ (

)_______________ (

)

7.

Sugar = C12H22O11 =_____________ (

)

)

)_____________ (

)__________ (

)

Now, the coefficient in front of the molecule tells us how many molecules of that compound are present (ex. 2H2O is two water molecules). Therefore, each coefficient is multiplied by each subscript. If there is no subscript written, then it is automatically one. example: Five water molecules = 5H2O = Hydrogen ( 5 x 2 = 10) Oxygen (5 x 1= 5) 8.

Four Carbon Dioxide= 4CO2 = _______________ (

), _______________ (

)

9.

Three salt molecules = 3NaCl =_______________ (

)_______________ (

)

10.

4SO4 =

11.

3Na2SO4 = =_____________ (

_______________ (

) _______________ ( )_____________ (

)

)_______________ (

)...