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Remember!

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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Remember!

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  1. Remember! • Compounds are made of 2 or more atoms of different kinds bonded together! H2O - Water C6H12O6 - Glucose

  2. Biochemistry Counting Atoms

  3. 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!

  4. Subscripts • Al(NO3)3 There is 1 Al, 3 N, & 9 O! • (CH3)3CH There are 4 C & 10 H!

  5. 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!

  6. Counting Atoms • Practice Qs

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