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Remember! - PowerPoint PPT Presentation


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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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