workshop 3

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9/20/23, 12:55 AM Naming Compounds, Molar Mass, The Mole, Empirical Formula Activity - Sept 18th/19th (Workshop 3) https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=11849091 1/46 Naming Compounds, Molar Mass, The Mole, Empirical Formula Activity - Sept 18th/19th (Workshop 3) Due: 11:59pm on Tuesday, September 19, 2023 To understand how points are awarded, read the Grading Policy for this assignment. Exercise 3.24 - Enhanced - with Feedback MISSED THIS? Read Section 3.3 (Page) . Determine the number of each type of atom in each formula: Part A Ca(NO 3 ) 2 ANSWER: Correct The subscript of 2 applies to both nitrogen and oxygen because they are enclosed within parentheses. Parentheses are used to group atoms, such as polyatomic ions. The name of the polyatomic ion, NO 3 , in this chemical formula in nitrate. Part B NH 4 Cl ANSWER: Correct Part C NaNO 3 ANSWER: Correct 2 calcium atoms, 6 nitrogen atoms and 6 oxygen atoms. 1 calcium atom, 1 nitrogen atom and 6 oxygen atoms. 2 calcium atoms, 2 nitrogen atoms and 6 oxygen atoms. 1 calcium atom, 2 nitrogen atoms and 6 oxygen atoms. 1 nitrogen atom, 1 hydrogen atom and 1 chlorine atom. 1 nitrogen atom, 4 hydrogen atoms and 1 chlorine atom. 4 nitrogen atoms, 4 hydrogen atoms and 1 chlorine atom. 1 nitrogen atom, 1 hydrogen atom and 4 chlorine atoms. 1 sodium atom, 1 nitrogen atom and 3 oxygen atoms. 1 sodium atom, 3 nitrogen atoms and 3 oxygen atoms. 3 sodium atoms, 3 nitrogen atoms and 3 oxygen atoms. 1 sodium atom, 2 nitrogen atoms and 3 oxygen atoms.
9/20/23, 12:55 AM Naming Compounds, Molar Mass, The Mole, Empirical Formula Activity - Sept 18th/19th (Workshop 3) https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=11849091 2/46 Part D KHSO 4 ANSWER: Correct Exercise 3.29 - Enhanced - with Feedback and Hints MISSED THIS? Read Section 3.2 (Page) . Part A Classify each of the following compounds as ionic or molecular. Drag the appropriate items to their respective bins. Hint 1. Classify the bonds in the compounds as ionic or covalent The sharing of electrons by two nonmetals is known as a covalent bond. Conversely, the bonding of a metal and a nonmetal via the loss and gain of electrons is known as an ionic bond. Classify each bond as covalent or ionic. Drag the appropriate items to their respective bins. ANSWER: ANSWER: 1 potassium atom, 4 hydrogen atoms, 4 sulfur atoms, and 4 oxygen atoms. 4 potassium atoms, 4 hydrogen atoms, 4 sulfur atoms, and 4 oxygen atoms. 1 potassium atom, 1 hydrogen atom, 4 sulfur atoms, and 4 oxygen atoms. 1 potassium atom, 1 hydrogen atom, 1 sulfur atom, and 4 oxygen atoms. Reset Help S and O N and H Sr and F Fe and O Covalent bond Ionic bond
9/20/23, 12:55 AM Naming Compounds, Molar Mass, The Mole, Empirical Formula Activity - Sept 18th/19th (Workshop 3) https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=11849091 3/46 Correct Molecular compounds are held together by covalent bonds between nonmetal atoms. Coversely, ionic compounds are held together by ionic bonds between a metal and a nonmetal. SO 3 and NH 3 have only nonmetals in their composition, and, therefore, the bonds in these compounds are covalent and the compounds are molecular. Fe 2 O 3 and SrF 2 each have a metal in their composition ( Fe and Sr , respectively), and, therefore, the bonds in these compounds are ionic and the compounds are subsequently ionic. Exercise 3.32 - Enhanced - with Feedback MISSED THIS? Read Section 3.4 (Page) . Part A Based on the molecular views, classify each substance as an atomic element, a molecular element, an ionic compound, or a molecular compound. Drag the appropriate items to their respective bins. ANSWER: Reset Help Fe 2 O 3 NH 3 SO 3 SrF 2 Molecular Ionic
9/20/23, 12:55 AM Naming Compounds, Molar Mass, The Mole, Empirical Formula Activity - Sept 18th/19th (Workshop 3) https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=11849091 4/46 Correct Elements can occur in atomic form (e.g., He atoms) or in diatomic form (e.g., N 2 and O 2 ), and the latter type is referred to as a molecular element . Compounds are formed between different elements, and the type of compound depends on the bond. Covalent bonds result in the formation of individual molecules or molecular compounds. Ionic bonds form between ions, and the electrostatic forces are strong, so ionic compounds tend to form lattice networks of alternating charges. Exercise 3.36 - Enhanced - with Feedback MISSED THIS? Read Section (Page) ; Watch KCV 3.5 , IWE 3.3 . Type a formula for the compound that forms between lithium and each polyatomic ion. Part A Enter the compound that forms between lithium and carbonate. Express your answer as a chemical formula. ANSWER: Correct The cation has a charge of 1 + , and the anion has a charge of 2 − . Two cations are needed to balance the charge on the anion: Li 2 CO 3 . Part B Enter the compound that forms between lithium and phosphate. Express your answer as a chemical formula. ANSWER: Reset Help Li 2 CO 3 Li 3 PO 4 Atomic element Molecular element Ionic compound Molecular compound
9/20/23, 12:55 AM Naming Compounds, Molar Mass, The Mole, Empirical Formula Activity - Sept 18th/19th (Workshop 3) https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=11849091 5/46 Correct The cation has a charge of 1 + , and the anion has a charge of 3 − . Three cations are needed to balance the charge on the anion: Li 3 PO 4 . Part C Enter the compound that forms between lithium and hydrogen phosphate. Express your answer as a chemical formula. ANSWER: Correct The cation has a charge of 1 + , and the anion has a charge of 2 − . Two cations are needed to balance the charge on the anion: Li 2 HPO 4 . Part D Enter the compound that forms between lithium and acetate. Express your answer as a chemical formula. ANSWER: Correct The cation has a charge of 1 + , and the anion has a charge of 1 − . One cation is needed to balance the charge on the anion: LiC 2 H 3 O 2 . Exercise 3.39 - Enhanced - with Feedback and Hints MISSED THIS? Read Section 3.5 (Page) ; Watch KCV 3.5 , IWE 3.11 . Give each ionic compound an appropriate name. Part A SnI 2 Spell out the full name of the compound. Hint 1. Classify metals based on the need to specify charge in their name The full name of an ionic compound can be constructed in the following way: name of cation (metal) charge of cation (metal) in Roman numerals in parentheses base name of anion (nonmetal) + ide However, specifying the charge of the cation is not necessary for all metals, because some of them can form ions of only one charge and therefore would be the same in all compounds. The charge only has to be specified for metals that can form ions of more than one charge. Classify the elements below based on their need to specifiy the charge in their name. Drag the appropriate elements to their respective bins. ANSWER: Li 2 HPO 4 LiC 2 H 3 O 2 ( )
9/20/23, 12:55 AM Naming Compounds, Molar Mass, The Mole, Empirical Formula Activity - Sept 18th/19th (Workshop 3) https://session.masteringchemistry.com/myct/assignmentPrintView?assignmentID=11849091 6/46 ANSWER: Correct The charge on Sn must be 2+ for the compound to be charge-neutral with two I anions. The name of SnI 2 is the name of the cation, tin , followed by the charge of the cation in parentheses and the base name of the anion, iod with the ending ide . The full name is tin(II) iodide. Part B CrS Spell out the full name of the compound. Hint 1. Classify metals based on the need to specify charge in their name The full name of an ionic compound can be constructed in the following way: name of cation (metal) charge of cation (metal) in Roman numerals in parentheses base name of anion (nonmetal) + ide However, specifying the charge of the cation is not necessary for all metals, because some of them can form ions of only one charge and therefore would be the same in all compounds. The charge only has to be specified for metals that can form ions of more than one charge. Classify the elements below based on their need to specifiy the charge in their name. Drag the appropriate elements to their respective bins. ANSWER: Reset Help Sn Cr Rb Ba tin(II) iodide ( ) Require specification of charge Do not require specification of charge
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