Ionic compounds magnesium chloride has the formula

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Ionic compoundsMagnesium chloride has the formula MgCl2, both magnesium andchloride ions are present in this compound.Why are two chloride ions represented with one magnesium ion?Do the atomic radii given here confirm your size predictions for sodiumand oxide ions that you made above on page 1?Complete the table where each row deals with a compound:MgCl2
21Compound formulaIons presentNameCaCl2Calcium chlorideNa+, F-CaOPotassium sulfide3.Polyatomic ionsIons that contain more than one atom, calledpolyatomic or molecular ions, are alsocommon and important. Two ions arerepresented here using “ball and stick” modelsof the atoms bonded together, Ion I and Ion II.Work out the formulae for the two molecularions and find out their names and charges. Clue: these are anions.Now, using these two anions, give example compounds with the cations below and complete thetable.Anion from aboveCounter ionNames and formulae of compoundsK+K+Mg2+Mg2+Al3+Al3+END PART B OF WORKSHOP
22Workshop 1 Part B Notes.1.Ions2.Ionic compounds3.. Polyatomic or Molecular ions
23Workshop 1 Part C online examples and practice
24Workshop 1 Part C online examples and practice
25Workshop 2: Molar QuantitiesThis workshop focuses on calculation of amount of substance. We are interested in how muchsubstance on the basis of how many particles of a substances. This is because when substancesreact, they do so in ratios of particle numbers, regardless of mass of those particles. For example amolecule of hydrogen gas, containing two very light hydrogen atoms, is formed when a zinc atomreacts with two hydrogen ions in an acid. The zinc atom has a mass of 65.38 amu (atomic massunits), whereas the two hydrogen atoms in the molecule have a combined mass of only 2.02 amu.We effectively take quantities of a substance measured by mass but accounting for the variousmasses of the atoms making up that substance. We do this using the mol unit.Workshop Part A: Calculating mass and molar amounts of substance.Workshop Part B:Calculating amounts of substances in reactionsWorkshop Part C: Calculating amounts in context.Objectives for this workshop are that you will be able to:Using data from the Periodic Table, calculate molar massDistinguish the limiting reagent in a reactionPredict the theoretical yieldCalculate the % yield3.Before this workshop Part A:Check back over formulae and naming of compounds from last week. Getting the calculationscorrect is totally dependent on having the correct formula for a substance. See also lecture notes andCore Concepts sections 4.4, 4.6.1.Molar mass and Avogadro’s number:Ammonia, NH3, a molecular compound of hydrogen and nitrogenHow many atoms of nitrogen occur in the formula?

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Chemistry, Atom, Molecule, Ion

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