Download Determining Ionic Compounds: Naming, Formulas, and Properties and more Study notes Chemistry in PDF only on Docsity! Is a given atom more likely to form an anion or a cation? What mono-atomic ions will each of the elements form? EP 24: Barium (Z = 56, 2A) EP 25: Sulfur (Z = 16, 6A) EP 26: Aluminum (Z = 13, 3A) EP 27: Fluorine (Z = 9, 7A) Plan: We use the “Z” value to find the element in the periodic table, and then find the nearest noble gas. Elements that lie after a noble gas (on left side of periodic table) will lose electrons. Elements that lie before a noble gas (on right side of periodic table) will gain electrons. EP 28: Sodium (IA) and Oxygen (VIA) Na2O sodium oxide EP 29: Zinc (IIB) and Chlorine (VIIA) ZnCl2 zinc chloride EP 30: Calcium (IIA) and Fluorine (VIIA) CaF2 calcium fluoride EP 31: Strontium (IIA) and Nitrogen (VA) Sr3N2 strontium nitride EP 32: Hydrogen and Iodine (VIIA) HI hydrogen iodide EP 33: Scandium(IIIB) and Sulfur (VIA) Sc2S3 scandium sulfide Give the Name and Chemical Formulas of the Compounds formed from the following pairs of elements Examples of Names and Formulas of Oxoanions and Their Compounds - I EP 38: KNO2 potassium nitrite EP 39: Mg(NO3)2 magnesium nitrate EP 40: LiClO4 lithium perchlorate EP 41: NaClO3 sodium chlorate EP 42: RbClO2 rubidium chlorite EP 43: CsClO cesium hypochlorite EP 61: calcium nitrate Ca(NO3)2 EP 62: ammonium sulfite (NH4)2SO3 EP 63: strontium sulfate SrSO4 EP 64: lithium nitrite LiNO2 EP 65: potassium hypochlorite KClO EP 66: lithium perbromate LiBrO4 EP 67: rubidium chlorate RbClO3 Determining Names and Formulas of Ionic Compounds Containing Polyatomic Ions EP 50: magnesium perchlorate Magnesium is the Mg2+ cation, and perchlorate is the ClO4- Anion; therefore we need two perchlorate anions for each Mg cation. The formula is Mg(ClO4)2 EP 51:(NH4)2SO3 NH4+ is the ammonium ion, and SO32- is the sulfite anion; therefore the name is ammonium sulfite EP 52: calcium nitrate Calcium is the Ca2+ cation, and nitrate is the NO3- anion; therefore the formula is Ca(NO3)2 Calculating the Number of Moles and Atoms in a Given Mass of Element EP 69: Tungsten (W) is the element used as the filament in light bulbs, and has the highest melting point of any element, 3680°C. How many moles of tungsten, and atoms of the element are contained in a 35.0 mg sample of the metal? Step 1: task Calculate the number of moles and atoms in W sample. Step 2: given information The mass is 35.0 mg Step 3: strategy Number of moles = (mass sample)/(atomic mass). Number of atoms = Number of moles x NA Step 4: set up calculation Step 5: right units? Step 6: calculate, sig figs -1 35.0 mg 1 gnumber of moles = 183.9 g mol 1000 mg × -1 35.0 mg 1 gnumber of moles = 183.9 g mol 1000 mg × 4 -1 35.0 mg 1 gnumber of moles = 1.90 10 moles 183.9 g mol 1000 mg −× = × 23 20 number of atoms = number of moles 6.022 10 1.15 10 atoms × × = × Calculating the Moles and Number of Formula Units in a given Mass of Compound EP 70: Sodium phosphate is a component of some detergents. How many moles and formula units are in a 38.6 g sample? Step 1: task Calculate the number of moles and formula units in Na3PO4 sample. Step 2: given information The mass is 38.6 g Step 3: strategy Number of moles = (mass sample)/(molecular mass). Number of formula units = Number of moles x NA
