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Remember!. Compounds are made of 2 or more atoms of different kinds bonded together!. H 2 O - Water. C 6 H 12 O 6 - Glucose. Biochemistry. Counting Atoms. Subscripts. Written below the level of the line Signify the number of atoms in the molecule 1 Mg atom + 2 Cl atoms  MgCl2

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Presentation Transcript
Remember
Remember!

  • Compounds are made of 2 or more atoms of different kinds bonded together!

H2O - Water

C6H12O6 - Glucose


Biochemistry

Biochemistry

Counting Atoms


Subscripts
Subscripts

  • Written below the level of the line

  • Signify the number of atoms in the molecule

    1 Mg atom + 2 Cl atoms  MgCl2

  • Polyatomic Ions: group together as one

    • Written in parenthesis

    • You must multiply through!


Subscripts1
Subscripts

  • Al(NO3)3

    There is 1 Al, 3 N, & 9 O!

  • (CH3)3CH

    There are 4 C & 10 H!


Coefficients
Coefficients

  • Written to the left of the molecule

  • Signify the number of molecules

    5NaCl  5 molecules of NaCl  10 total atoms

  • 3NO2 contains 3 N & 6 O!

C6H12O6 – Glucose

2C6H12O6 – 2 Glucose molecules!


Counting atoms
Counting Atoms

  • Practice Qs


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