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Counting Atoms!!

Counting Atoms!!. Oct 5 th 2012. Reactants and Formulas. Write: HCl + NaOH  NaCl + H 2 O And label the reactants and the products. The law of Conservation of Mass- the mass of substances in a closed system will remain constant, no matter what processes are acting inside the system.

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Counting Atoms!!

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  1. Counting Atoms!! Oct 5th 2012

  2. Reactants and Formulas • Write: HCl + NaOH NaCl + H2O And label the reactants and the products

  3. The law of Conservation of Mass- • the mass of substances in a closed system will remain constant, no matter what processes are acting inside the system.

  4. We know what is a formula • We have seen that a chemical formula is… • A number of atoms that make up ONE compound • Ex. Mg2O • So this example will have what number of elements? • Mg:2 • O:1 • Therefore….2 Mg and 1 Oxygen is the chemical formula for making the compound= Mg2O

  5. But wait….there is more! • Vocab: • Coefficients- A number in front of a chemical formula(compound) used to tell the number of compounds. Ex. (The #2 in 2Pb3O4)

  6. Subscripts • Vocab: • Subscripts: A SMALL number written after an element in a chemical formula telling how many of that element is in the formula. Ex. FeS2  this two is a subscript

  7. Write in IAN please

  8. Alright, how many total atoms of each • Mg2P2O7= • AuCl3= • C4H12O2 = • 2C3H4 • CaMgSi3O8= • CaHPO3 + 3H2O = • 3CuCl2 = • Pb3O4=

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