Naming And Writing Formulas For 9 2 Ionic Compounds-Books Pdf

Naming and Writing Formulas for 9 2 Ionic Compounds
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chem TE ch09 fm Page 261 Thursday April 14 2005 2 47 PM. Naming Binary Ionic Compounds A binary compound is composed Word Origins Binary Ionic Compounds. of two elements and can be either ionic or molecular If you know the for Binary comes from the Latin. mula for a binary ionic compound you can write its name First you must. verify that the compound is composed of a monatomic metallic cation and. word bini meaning two by, two or twofold Binary, Word Origins L2. a monatomic nonmetallic anion The compound Cs2O is composed of the compounds consist of two A binary star is a system of two stars. metal cesium and the nonmetal oxygen Both cesium and oxygen are Group elements Predict what a that revolve around each other. A elements so each ion has only one charge To name any binary ionic binary star might be and. compound place the cation name rst followed by the anion name The then check your prediction. name of Cs2O then is cesium oxide The name of NaBr is sodium bromide in the dictionary Relate L1. and the name of SrF2 is strontium uoride But suppose you want to name. the binary ionic compound CuO Following the rule above you would name Ask Do you or someone you know. this compound copper oxide However the name copper oxide is incom have a nickname Does the nick. plete Recall that copper commonly forms two cations Cu and Cu2 The name tell something about the per. names of these ions are copper I ion and copper II ion respectively How son Students will have a variety of. can you tell which of these cations forms the compound CuO Working. responses Guide students to recog, backward will help The formula indicates that the copper cation and the. oxide anion combine in a 1 1 ratio You know that the oxide anion always has. nize that nicknames are somewhat like, a 2 charge Therefore the charge of the copper cation must be 2 in order the common names used to describe. to balance the 2 charge The compound CuO must be copper II oxide compounds Use sodium carbonate. The formula for copper I oxide is Cu2O Na2CO3 as an example Its common. Table 9 2 lists the symbols and names of the common metal ions that form name is soda or soda ash Ask Which. more than one ion Recall that the charges of monatomic anions can be deter. mined from the periodic table those of polyatomic anions are shown in Table. tells you more about the compound, 9 3 Using these sources you can write the names of SnF2 and SnS2 Tin Sn soda or sodium carbonate sodium. forms cations with 2 and 4 charges Fluorine is a Group 7A element so the carbonate. charge of the fluoride ion is 1 In SnF2 the ratio of cation to anion is 1 2 There. fore the charge of the tin cation must be 2 to balance the combined 2 charge Figure 9 8 Tin II fluoride and. of two fluoride ions The name of SnF2 is tin II fluoride or stannous fluoride tin IV sulfide have different CLASS Activity. However the name of SnS2 is not tin II sulfide Sulfur is a Group 6A element so compositions and uses. its charge is 2 The charge of the tin cation must be 4 to balance the com a Tin II fluoride is added to. toothpastes to prevent cavities, Naming Ionic Binary.
bined charges of two sulfur anions Thus the name of SnS2 is tin IV sulfide or. b Tin IV sulfide is used in Compounds L2, stannic sulfide Figure 9 8 shows examples of uses of stannous fluoride and stan. glazes for porcelain fixtures and Purpose Students practice naming. nic sulfide, dishes Inferring What are the, charges on the tin ions in the. binary compounds, Checkpoint What are the charges of the two ions of copper. two compounds Materials chalkboard chalk, Procedure Divide the class into. a b teams Have each team write the, names of ionic compounds on a sheet.
of paper as you write formulas on the, board Use chlorides bromides phos. phides and oxides of the elements of, Groups 1A 2A and aluminum in 3A. Mix in sulfides oxides chlorides and, bromides of lead tin iron cobalt cop. per and zinc Have the teams compare, their lists of names When a discrep. ancy occurs have them discuss it and, come to agreement on the correct.
name Save the lists of names for the, Section 9 2 Naming and Writing Formulas for Ionic Compounds 261 activity on page 263. Differentiated Instruction, Less Proficient Readers L1. Cut index cards to obtain pieces that are one each card write the formula for an ion hav. third and two thirds of a card Keep some ing the appropriate charge Have students. cards whole On some whole cards mark match single positive and negative signs. three large positive signs on others mark Have them match double positive signs with. three large negative signs Mark some of the double negative signs and with two single Answers to. one third pieces with single positive signs positive signs Continue with all possible. Figure 9 8 2 and 4, others with single negative signs Mark the combinations Then have students turn the. two thirds pieces with two positive signs or cards over to see the formulas of the ionic. Checkpoint 1 and 2, two negative signs On the opposite side of compounds they produced. Chemical Names and Formulas 261, chem TE ch09 fm Page 262 Monday April 17 2006 11 43 AM.
Section 9 2 continued Figure 9 9 In the process for. making steel iron is extracted, from hematite an ore. containing iron III oxide, TEACHER Demo Applying Concepts What is. the formula for iron III oxide, Making and Naming an Ionic. Compound L2, Purpose Students see a reaction in, which an ionic compound is formed. and then name the compound and, write its formula, Materials 1 g powdered zinc 4 g.
iodine I2 watch glass eyedropper Writing Formulas for Binary Ionic Compounds If you know the. name of a binary ionic compound you can write its formula Write the. 8 mL water, symbol of the cation and then the anion Add whatever subscripts are needed. Safety Wear goggles and perform the to balance the charges The positive charge of the cation must balance the. For Links on Ionic, demo in a fume hood Place the zinc Compounds negative charge of the anion so that the net ionic charge of the formula is. iodide in a plastic or cardboard con Visit www SciLinks org zero The ionic compound potassium chloride is composed of potassium. Web Code cdn 1092 cations K and chloride anions Cl so potassium chloride is a binary. tainer and dispose of it in an approved, ionic compound The charge of each K cation is balanced by the charge of. landfill site each Cl anion so in potassium chloride the potassium and chloride ions. Procedure Wear safety goggles and combine in a 1 1 ratio Thus the formula for potassium chloride is KCl The. use a fume hood Mix 1 g of powdered net ionic charge of the formula unit is zero. zinc Zn and 4 g of iodine I2 on a The binary ionic compound calcium bromide is composed of calcium. cations Ca2 and bromide anions Br The two ions do not have equal. watch glass With an eyedropper care numerical charges Thus each calcium ion with its 2 charge must com. fully add 8 mL of water one drop at a bine with or be balanced by two bromide ions each with a 1 charge. time After the reaction is complete That means that the ions must combine in a 1 2 ratio so the formula for. show students the zinc iodide that was calcium bromide is CaBr2 The net ionic charge of the formula unit is zero. formed Write the formula unit for zinc Figure 9 9 shows one step in the process of making steel from iron ore. Hematite a common ore of iron contains iron III oxide What is the for. iodide ZnI2 along with its name on, mula for this compound Recall that a Roman numeral in the name of an. the chalkboard Ask What happened ion shows the charge of the metal ion Thus iron III oxide contains Fe3. to elemental Zn and I2 during the cations combined with oxide anions O2 How can you balance a 3. reaction Zinc and iodine reacted to charge and a 2 charge You must find the least common multiple of the. form an ionic compound composed of charges which is 6 Iron s three charges taken two times equals six 3 2. 6 Oxygen s two charges taken three times also equals six Thus two. Zn2 and I ions Use the criss cross, Fe3 cations a 6 charge will balance three O2 anions a 6 charge The.
method to show how the formula unit balanced formula then is Fe2O3. for zinc iodide was derived Why is Another approach to writing a balanced formula for a compound is to. ZnI2 named zinc iodide and not use the crisscross method In this method the numerical value of the. zinc II iodide Zinc forms only one charge of each ion is crossed over and becomes the subscript for the other. ion ion Notice that the signs of the charges are dropped. Expected Outcome The masses of Zn Fe, and I2 are the stoichiometic amounts Simulation 9 Simulate. combining ions and deriving Fe2O3, The reactants should be used up and the chemical formulas for 2 3 3 2 0. white crystalline ZnI2 formed several ionic compounds The formula is correct because the overall charge of the formula is zero. with ChemASAP and the subscripts are in the lowest whole number ratio. 262 Chapter 9, Facts and Figures, Download a worksheet on Ionic. Compounds to complete and find Lattice Energy in Ionic Bonding. additional teacher support from Ionic compounds tend to be stable energy in electron transfer can take place Some energy. NSTA SciLinks the form of heat or electricity is needed to electron affinity is released when the non. decompose them Thus energy must be metal gains one or more electrons but this is. released when ionic bonds form But the not enough to make the entire process exo. released energy is not primarily from the trans thermic It is lattice energy that makes the dif. fer of electrons Forming a cation is an endo ference Lattice energy is the energy released. thermic process In addition both the metal when gaseous cations and anions settle into. and the nonmetal must be vaporized the orderly crystal structure characteristic of a. another endothermic process before solid ionic compound. 262 Chapter 9, chem TE ch09 IPL fm Page 263 Sunday August 8 2004 12 53 PM. If you use the crisscross method to write the formula for some com. pounds such as calcium sulfide Ca2 and S2 you will obtain the result CLASS Activity. Ca2S2 The 2 2 ratio of calcium and sulfide ions is not the lowest whole. number ratio The formula for calcium sulfide is CaS Formulas for Binary Ionic. Compounds L2, Ca2S2 reduces to CaS Purpose Students become more pro.
1 2 1 2 0 ficient in writing formulas, Of course if the magnitudes of the charges of the cation and anion are Materials The lists of names of ionic. the same as they are in this case the ions combine in a 1 1 ratio and the. compounds generated in the activity, charges are balanced. Checkpoint Explain why the formula CaS is correct Procedure Have teams of students. write the formulas for the names on, the lists When the formulas on two or. more lists do not agree have the teams, CONCEPTUAL PROBLEM 9 2. resolve the discrepancy by using the, Writing Formulas for Binary Ionic Compounds criss cross method to write the formula.
Write formulas for these binary ionic compounds on the board. a copper II sul de shown in the photo, b potassium nitride. CONCEPTUAL PROBLEM 9 2, Analyze Identify the relevant concepts Balance the formula using appropriate. Binary ionic compounds are composed of a mon subscripts Answers. atomic cation and a monatomic anion The ionic a 10 a BaS b Li2O c Ca3N2 d CuI2. charges in an ionic compound must balance add Cu S. 11 a NaI b SnCl2 c K2S d CaI2, up to zero and the ions must be in the lowest CuS. whole number ratio The symbol for the cation b Practice Problems Plus L2. appears rst in the formula for the compound K N, Write formulas for these compounds. Solve Apply concepts to this situation a lithium fluoride LiF. The ions are in the lowest whole number, Write the symbol and charge for each ion in each ratio and the net ionic charge is zero.
b aluminum chloride AlCl3, compound 1 2 1 2 0 and 3 1 1 3 0 c sodium nitride Na3N. a Cu2 and S2 b K and N3 d ferric oxide Fe2O3, Practice Problems. 10 Write formulas for compounds formed from, these pairs of ions. a Ba2 S2 b Li O2, c Ca2 N3 d Cu2 I, Problem Solving 9 11 Solve. 11 Write formulas for these compounds Problem 11 with the help of an. a sodium iodide b stannous chloride interactive guided tutorial. c potassium sul de d calcium iodide with ChemASAP, Section 9 2 Naming and Writing Formulas for Ionic Compounds 263.
Answers to, Figure 9 9 Fe2O3, Checkpoint The charges are. balanced and the subscripts are in, the lowest whole number ratio. Chemical Names and Formulas 263, chem TE ch09 IPL fm Page 264 Friday August 6 2004 9 48 AM. Section 9 2 continued Compounds with Polyatomic Ions. The pearl and the oyster shell shown in Figure 9 10 are both made of cal. Compounds with cium carbonate CaCO3 Calcium carbonate is obviously not a binary com. pound because it contains more than two elements Remember that an ate. Polyatomic Ions or ite ending on the name of a compound indicates that the compound. contains a polyatomic anion that includes oxygen This compound. contains one monatomic ion Ca2 and one polyatomic ion CO32. TEACHER Demo Figure 9 10 also shows a typical automobile battery called a lead storage. battery The energy producing reaction inside the battery uses the ionic. Making and Naming Lead compound lead II sulfate PbSO4 which consists of the monatomic ion. Section 9 2 Naming and Writing Formulas for Ionic Compounds 261 Naming Binary Ionic Compounds A binary compoundis composed Word Origins of two elements and can be either ionic or molecular If you know the for mula for a binary ionic compound you can write its name First you must verify that the compound is composed of a monatomic metallic

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