Representative Particles Whatever type of particle that is being examined. •Atom – any single element that is part of the overall compound. •Ion – an atom or group of atoms that has a net charge •Molecule – a group of atoms that have been chemically combined. There is no net charge on a molecule.
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Representative Particles Whatever type of particle that is being examined.
Representative Particles Whatever type of particle that is being examined. Atom – any single element that is part of the overall compound. Ion – an atom or group of atoms that has a net charge Molecule – a group of atoms that have been chemically combined. There is no net charge on a molecule. - PowerPoint PPT Presentation
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Representative Particles
Whatever type of particle that is being examined.
•Atom – any single element that is part of the overall compound.
•Ion – an atom or group of atoms that has a net charge
•Molecule – a group of atoms that have been chemically combined. There is no net charge on a molecule.
Determine how many atoms, ions and molecules are in each example:Pb(NO3)2
The size of an atom, ion or molecule is too small to deal with on an individual basis in the lab. Therefore, normally in chemistry we deal in moles of atoms, ions or molecules. A mole can have multiple definitions:
1 mole = 6.022 E 23 (Avogadro’s number)
= atomic weight in grams
= 22.4 liters (for gases only)
Molar Mass – the mass, in grams, of 1 mole of any substance. It is found by taking the atomic weight from the periodic table, and rounding to one place past the decimal.
The molar mass of each of the following:
Be = 9.0 grams
Cr = 52.0 grams
Cl = 35.5 grams
S = 32.1 grams
O = 16.0 grams
Calculate the molar mass of the following:BeCl2, BeSO4, Cr(ClO3)3, Cr2(SO4)3 and (NH4)3PO4