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# Final NB 2016-2017 Turley

## LG:The students will

LG:The students will learn how balanced chemical equations are used in stoichiometric calculations and how to calculate amounts of reactants and products in a chemical equation. www.youtube.com/watch?v=AsqEkF7hcII www.youtube.com/watch? v=tEn0N4R2dqA www.youtube.com/ watch?v=Pft2CASl0M0 www.youtube.com/ watch?v=rwhJklbK8R0 The Mole -Law- As you increase the volume of gas, you increase the atoms. -Forms a bridge between the mass of something and the number of particles. -amu-> Molar Mass (g) - A mole of any substance is the molecular weight of that substance in grams. -The number of atoms or other particles in a mole is the same for all substances. -A mole is simply a unit of measurement. -moles give us a consistent method to convert between atoms/ molecules and grams. -How many grams of carbon dioxide is 0.2 moles of CO2? 1.number of grams per mole CO2 = 12.01 + [2 x 16.00] 2.number of grams per mole CO2 = 12.01 + 32.00 3.number of grams per mole CO2 = 44.01 gram/mole Averagado's Number 6.02x10 23 -The mole is one of the base units of the SI, and has the unit symbol mol. - Amedeo Avogadro was an Italian physics professor who proposed in 1811 that equal volumes of different gases at the same temperature contain equal numbers of molecules. -theory that in a defined mass of an element (its atomic weight) there is a precise number of atoms: Avogadro's number. 84

LG:The students will learn how balanced chemical equations are used in stoichiometric calculations and how to calculate amounts of reactants and products in a chemical equation. www.youtube.com/watch?v=BTRm8PwcZ3U www.youtube.com/watch?v=F9NkYSKJifs www.youtube.com/watch?v=xPdqEX_WMjo Molar Mass -the molar mass M is a physical property defined as the mass of a given substance -The base SI unit for molar mass is kg/mol. -Steps for finding Molar Mass 1.Use the chemical formula to determine the number of each type of atom present in the compound. 2.Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound. 3.Add it all together and put units of grams/mole after the number. -The precision to which a molar mass is known depends on the precision of the atomic masses from which it was calculated -Molar mass serves as a bridge between the mass of a material and the number of moles since it is not possible to measure the number of moles directly -the smallest quantity of a substance will contain billions of atoms, so chemists generally use the mole as the unit for the amount of substance -molar mass can also be calculated by multiplying the atomic mass in amu by the molar mass constant (1 g/mol) -To calculate the molar mass of a compound with multiple atoms, sum all the atomic mass of the constituent atoms 85

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