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Atoms Combine to Make Compounds Learning Goals: I will be able to define pure substance, element, compound, and molecule. I will be able to use subscripts to describe how many atoms make up a compound. Pure Substances: A pure substance is matter that is made up of only one type of particle. An element has only one type of atom A compound has 2 or more atoms that are joined chemically by a bond. Found on Pure Substance Made from from the PT Element or Compound? CaCO3 Au AuO Br2 How We Represent Chemical Compounds Subscripts are ____________________ numbers that tell us the number of each type of atom in a compound. If there is no number stated then it automatically means there is ______________ atom present. Coefficients are _____________numbers in front of formulas that tell us we have more than 1 molecule present. Counting Atoms Every Capital Letter represents a new atom…it may be helpful to put lines between the element symbols. State each element’s name (use the periodic table) State the number of each atom present (using the subscripts). Examples: CaBr2 MgCO3 Be(OH)2 2NaCl Questions: 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: A) MgCl2 Mg – 1 Cl – 2 B) 5 ZnSO4 Zn – 5 3 total S–5 O – 20 1) NaOH 2) 4 HNO3 4) 4 Li2O 5) 2 NaOH 7) 3 H2O 8) NaC2H3O2 3) MgCl2 6) Li2SO4 9) 3 Al2O3 30 total 10) NH4Cl 11) 5 ZnSO4 12) 7 C2S2 SUPER STAR CHALLENGE! 13) 2 Sr3(PO4)2 14) 4 Al(OH)3 16) 4 Al2(SO3)3 17) 2 (NH4)3PO4 15) Ca (C2H3O2)2 18) 4 Mg(OH)2