ࡱ> q` \bjbjqPqP ::*A 444,U,U,U,UUDȜ W^~W~W~WWMg s$LhP%]4{5 M{{%~WWY3{ ~W^4W{64WW  ,U ۘ$0Ȝ4${{{{{{{%%{{{Ȝ{{{{DM,U,U Name Class Date 5. Use Table 9.5 to help you complete the table about acids.   Names and Formulas of Bases 6. A base is a compound that produces when dissolved in water. 7. How are bases named? 9.5 The Laws Governing How Compounds Form  Rules for naming and writing compound formulas are possible because laws govern how compounds are formed. Lesson Summary The Laws of Definite and Multiple Proportions The laws of definite and multiple proportions describe the ratios in which elements combine to form compounds. The law of definite proportions states that in any sample of a compound, the masses of the elements in the compound are always in the same proportion. The law of multiple proportions applies when the same two elements form more than one compound. When two elements form more than one compound, the law of multiple proportions says that the masses of one element combine with the same mass of the other element in simple, whole-number ratios. Practicing Skills: Chemical Names and Formulas To name or write the formula of a compound, you must first decide what type of compound it is. Types of compounds include acids, binary compounds, compounds with polyatomic ions, and compounds containing metallic cations with different ionic charges. 117 Name Class Date   To find a mass ratio, follow a few simple steps: Write down the known masses of both elements in both compounds. Identify the element for which you are trying to find the ratio. Divide the element for which youre finding the mass ratio by the other known element to get both compounds in equal proportions. To compare compound A to compound B, divide the mass of A by the mass of B. To compare compound B to compound A, divide B by A to obtain the mass ratio. If the nearest whole number is requested for the ratio, the answer will need to be rounded to the nearest whole number. Sample Problem Carbon reacts with oxygen to create two compounds. Compound A contains 4.78 g of carbon for each 5.24 g of oxygen. Compound B contains 3.63 g of carbon for each 12.6 g of oxygen. What is the mass ratio of carbon rounded to the nearest whole number?    118 Name Class Date    Now its your turn to practice finding mass ratios. Remember to get the two compounds in equal proportions before finding the mass ratio. 1. Magnesium reacts with oxygen to form two compounds. Compound A contains 7.88 g of magnesium for every 15.68 g of oxygen. Compound B contains 2.12 g of magnesium for every 6.91 g of oxygen. What is the mass ratio of magnesium rounded to the nearest whole number? 2. Chlorine reacts with oxygen to form two compounds. Compound A contains 8.43 g of chlorine for every 13.67 g of oxygen. Compound B contains 5.87 g of chlorine for every 17.33 g of oxygen. What is the mass ratio of chlorine rounded to the nearest whole number? 119 Name Class Date 3. Lead forms two compounds when it reacts with oxygen. Compound A contains 8.45 g of lead for every 4.79 g of oxygen. Compound B contains 4.55 g of lead for every 0.77 g of oxygen. What is the mass ratio of oxygen rounded to the nearest whole number? 4. Sulfur reacts with oxygen and creates two compounds. Compound A contains 1.34 g of sulfur for every 0.86 g of oxygen. Compound B contains 11.63 g of sulfur for every 10.49 g of oxygen. What is the mass ratio of oxygen rounded to the nearest whole number? After reading Lesson 9.5, answer the following questions. The Laws of Definite and Multiple Proportions 5. What is the law of definite proportions? 6. Circle the whole-number mass ratio of Li to Cl in LiCl. The atomic mass of Li is 6.9; the atomic mass of Cl is 35.5. a. 42:1 b. 5:1 c. 1:5 7. Circle the whole-number mass ratio of carbon to hydrogen in C2H4. The atomic mass of C is 12.0; the atomic mass of H is 1.0. a. 1:6 b. 6:1 c. 1:12 d. 12:1 8. In the compound sulfur dioxide, a food preservative, the mass ratio of sulfur to oxygen is 1:1. An 80-g sample of a compound composed of sulfur and oxygen contains 48 g of oxygen. Is the sample sulfur dioxide? Explain. 120 Name Class Date 9. What is the law of multiple proportions? 10. Complete the table using the law of multiple proportions.  Practicing Skills: Chemical Names and Formulas 11. How can a flowchart help you to name chemical compounds? 12. Use the flowchart in Figure 9.18 to write the names of the following compounds: a. CsCl b. SnSe2 c. NH4OH d. HF e. Si3N4 13. Complete the following five rules for writing a chemical formula from a chemical name. a. In an ionic compound, the net ionic charge is . b. An -ide ending generally indicates a(n) compound. c. An -ite or -ate ending means that the formula contains a(n) ion that includes oxygen. d. in a name generally indicate that the compound is molecular and show the number of each kind of atom in the molecule. e. A(n) after the name of a cation shows the ionic charge of the cation. 121 Name Class Date 14. Fill in the missing labels from Figure 9.19.      15. Use the flowchart in Figure 9.19 to write the formulas of the following compounds: a. potassium silicate b. phosphorus pentachloride c. manganese(II) chromate d. lithium hydride e. diiodine pentoxide 122 Name Class Date Guided Practice Problems Answer the following questions about Practice Problem 2. How many electrons were lost or gained to form these ions? a. Fe3+ b. O2" c. Cu+ d. Sr2+ Step 1. Determine the number of electrons based on the size of the charge. Step 2. Determine whether the electrons were lost or gained based on the sign of the charge. a. b. c. d. Answer the following questions about Practice Problems 10b and 10c. Write formulas for compounds formed from these pairs of ions. b. Li+, O2" c. Ca2+, N3" Li+, O2" Analyze Step 1. Do the ions combine in a 1:1 ratio? Solve Step 2. Use the crisscross method to balance the formula. Write the formula. Ca2+, N3" Analyze Step 1. Will the calcium (Ca2+) and nitride (N3") ions combine in a 1:1 ratio? How do you know? Solve Step 2. Use the crisscross method to balance the formula. Write the formula. 123 Name Class Date Answer the following questions about Practice Problem 15b. Write the formula for chromium(III) nitrite. Step 1. Is the compound ionic or molecular? Explain. Step 2. Use Table 9.3 to write the formula for the nitrite ion. Step 3. Use the crisscross method to balance the formula. Write the formula. Answer the following questions about Practice Problem 48. Lead forms two compounds with oxygen. One compound contains 2.98 g of lead and 0.461 g of oxygen. The other contains 9.89 g of lead and 0.763 g of oxygen. For a given mass of oxygen, what is the lowest whole-number mass ratio of lead in the two compounds? Complete the following steps to solve the problem. Step 1. Write the ratio of lead to oxygen for each compound.First compound  EMBED Equation.DSMT4 Second compound  EMBED Equation.DSMT4 Step 2. Divide the numerator by the denominator in each ratio.  EMBED Equation.DSMT4  EMBED Equation.DSMT4 Step 3. Write a ratio comparing the first compound to the second.Step 4. Simplify. Note that this ratio has no units. EMBED Equation.DSMT4  The mass ratio of lead per gram of oxygen in the two compounds is . 124 Name Class Date  Copper and chlorine form copper(I) chloride, CuCl, and copper(II) chloride, CuCl2. a. How do these compounds relate to the number of electrons gained or lost by copper? b. How does this information support the law of multiple proportions? 125 Name Class Date  For Questions 111, complete each statement by writing the correct word or words. If you need help, you can go online. 9.1 Naming Ions 1. When metals lose electrons, they form . 2. A(n) ion contains more than one atom and acts as a unit. 9.2 Naming and Writing Formulas for Ionic Compounds 3. To write the formula for an ionic compound, write the formulas for the cation and the anion, then use subscripts to charges. 4. To name an ionic compound, name the , then name the . 9.3 Naming and Writing Formulas for Molecular Compounds 5. To name a molecular compound, name the first element, add the root of the second element plus -ide, then add given by the formulas subscripts. 6. To write the formula of a molecular compound, write the symbol of each element, then write given by prefixes in the name of the compound. 9.4 Naming and Writing Formulas for Acids and Bases 7. Acids are named based on the present in the compound. 8. Bases are named like other compounds. 9.5 The Laws Governing How Compounds Form 9. If the ratio of the number of each type of atom is fixed, their ratio is also fixed. 10. When naming a compound of a metal that can have more than one charge, use a(n) to show the charge of the metal ion. 11. If the name of a compound ends in -ide, the compound is usually .   126 Name Class Date Review Vocabulary Fill in each of the blanks with a word or words that relate to each vocabulary term. 1. monatomic ion A monatomic ion contains only one and has either a positive or a negative . It differs from a(n) ion, which contains more than one atom. Ions with a positive charge are known as , and those with a negative charge are . The name of a positive monatomic ion is the . The name of a negative monatomic ion is the plus the suffix . 2. binary compound A binary compound might contain many atoms, but it contains only different types of atoms. The name of a binary compound consists of the names of the cation plus the name of the anion in the compound. binary compounds are named by using that show the number of each type of atom in the compound. 3. acid Acids contain atoms and release ions in solution. They differ from bases, which release ions in solution. Acids are named according to the present in the compound. The name of a binary acid includes the prefix , the root of the name of the other element present, the suffix , and the word . Other acids are named according to the name of the ion they contain. 4. law of definite proportions 5. law of multiple proportions These two laws help show how elements combine to form compounds. The law of definite proportions states that the of elements in a specific compound are always in the same . The law of multiple proportions is used when compound forms from two elements. It states that the amount of one element that combines with a specific amount of the other element in the compounds is in the ratio of . 127 Essential Understanding Acid NameFormulaAnion Nameacetic acidcarbonic acidhydrochloric acidnitric acidphosphoric acidsulfuric acid BUILD Math Skills Finding a Mass Ratio A mass ratio is a way of showing a proportion of two different masses or compounds. It tells you how much you have of one substance for every gramor other measurementyou have of another substance. If you had twice as much mass of compound A than you had of compound B, the ratio would be written as 2:1; which is read as two to one. Typically in mass ratio problems, the amount of the element you are trying to find will be based upon the amount of another element. For example, for compound A, you may have 3.28 g of C for every 2.63 g of O; and for compound B, you may have 6.32 g of C for every 1.68 g of O. So, if you were trying to find the ratio of carbon, you would need to find how much carbon exists for 1 g of oxygen for both compounds. You would do this by simply dividing the grams of carbon by the grams of oxygen. Compound A: 4.78 g C, 5.24 g O Compound B: 3.63 g C, 12.6 g O The question asks for the mass ratio of carbon so carbon is the element we want to compare. Write down the known masses of each element for both compounds. Identify the element for which you are trying to find the ratio.  EMBED Equation.DSMT4   EMBED Equation.DSMT4  Both compounds are now in g C/1.00 g O, so they are in equal proportions.  EMBED Equation.DSMT4   EMBED Equation.DSMT4  Since .166 is less than .5 the answer rounds down to 3.00, so the mass ratio is EMBED Equation.DSMT4  or 3:1. Next, get the two compounds in equal proportions by dividing the element for which you are trying to find the ratioin this case, carbonby the other element present, oxygen. Finally, round the answer to the nearest whole number. Now divide the equal proportioned amounts to get the ratio of carbon. Since it is not specified if you want to compare A to B or B to A, either proportion can be used. 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