University:
Widener University
Course:
1415R | Physical Chemistry
Academic year:

2022
Views:

304

Pages:

2
Author:

Koen D

Counting Atoms Worksheet Name: 1. The symbol of an element represents one atom of that element. e.g. Ca = 1 calcium atom 2. A subscript is a number written at the lower right corner behind the symbol of an element. If there is more than one atom of the element in the molecule, then a subscript is used to indicate the number of atoms. e.g. N2 = 2 Nitrogen atoms 3. A subscript outside a bracket multiplies all the elements inside the brackets. e.g. Ba3(PO4)2 = 3 Barium atoms; 2 Phosphorus Atoms; 8 Oxygen Atoms Directions for each problem 1) write down the different elements in each compound. 2) write down how many of that particular atom there are 3) how many atoms are there total in the compound. Examples: NaOH Na - 1 O -1 3 atoms in total H -1 1) NaOH 6) 4 HNO3 11) Mg(OH)2 2) MgCl2 7) 4 Li2O 12) NaOH 3) Li2SO4 8) 3 H2O 13) Al2(SO3)3 4) NaC2H3O2 9) Al2O3 14) (NH4)3PO4 5) NH4Cl 10) ZnSO4 15) Ca3(PO4)2 Ionic or Covalent Compounds Look at the chemical formula and label the compound as either ionic (I) or covalent (C). 1) NaF _______ 2) NF3 _______ 3) Li2O _______ 4) Al2S3 _______ 5) SiH4 6) P2O5 _______ 7) CH4 _______ _______ Look at the chemical name and label the compound as either ionic (I) or covalent (C). 8) lithium chloride ________ 9) nitrogen trichloride ________ 10) sodium oxide ________ 11) dinitrogen trioxide ________ 12) diboron dihydride ________ 13) potassium phosphide ________ 14) oxygen difluoride ________

Counting Atoms Worksheet

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