How can a roman numeral in a chemical name be used to write a chemical formula?A.The roman numeral is the charge on the nonmetal in the chemical formula.B.The roman numeral is the nonmetal's oxidation state used as the subscript on the metal in the crisscross method.C.The roman numeral is the subscript on the metal in the chemical formula.D.The roman numeral is the metal's oxidation state used as the subscript on the nonmetal in the crisscross method.
Question
How can a roman numeral in a chemical name be used to write a chemical formula?A.The roman numeral is the charge on the nonmetal in the chemical formula.B.The roman numeral is the nonmetal's oxidation state used as the subscript on the metal in the crisscross method.C.The roman numeral is the subscript on the metal in the chemical formula.D.The roman numeral is the metal's oxidation state used as the subscript on the nonmetal in the crisscross method.
Solution 1
The correct answer is B. The roman numeral in a chemical name is the metal's oxidation state, which is used as the subscript on the nonmetal in the crisscross method. Here's how you can use it to write a chemical formula:
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Identify the metal and nonmetal in the chemical name. The metal is usually the first element in the name, and the nonmetal is the second.
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Look at the roman numeral following the metal. This is the oxidation state of the metal, which tells you how many electrons it has lost or gained.
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Write the symbol for the metal, followed by the symbol for the nonmetal.
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Use the oxidation state of the metal (the roman numeral) as the subscript for the nonmetal. This tells you how many atoms of the nonmetal are needed to balance the charge of the metal.
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If necessary, reduce the subscripts to their lowest terms.
For example, if you have Iron (III) Oxide, the roman numeral III tells you that iron has an oxidation state of +3. So you write Fe for iron and O for oxide, and use the roman numeral as the subscript for oxide: Fe2O3.
Solution 2
The correct answer is D. The roman numeral is the metal's oxidation state used as the subscript on the nonmetal in the crisscross method.
Here's a step-by-step guide on how to use it:
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Identify the metal and nonmetal in the chemical name. The metal is usually the first element in the name, and the nonmetal is the second.
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Look at the Roman numeral in the chemical name. This represents the oxidation state of the metal.
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Write the symbol for the metal, followed by the symbol for the nonmetal.
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Use the oxidation state of the metal (the Roman numeral) as the subscript for the nonmetal.
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If the nonmetal also has a charge (or oxidation state), use this as the subscript for the metal.
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If the subscripts for the metal and nonmetal are the same, they can be reduced to 1.
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The resulting chemical formula should be neutral, meaning the total positive charge from the metal should equal the total negative charge from the nonmetal.
For example, if you have Iron (III) Chloride, the Roman numeral III indicates that iron has an oxidation state of +3. Chloride typically has a charge of -1. So, you would write the formula as FeCl3.
Similar Questions
Under Ionic or Covalent write in a "i" for ionic and a "c" for covalent. The next two blanks under name write the name of the compound. For the name of the compound. If the metal requires a Roman numeral, then make sure you put the name of the cation(metal) and the Roman numerals without a space in between them and use parenthesis around the roman numeral, like this: iron(II) or copper(I) Formula PbSO4ionic or covalent Name
The oxidation number of the metal is written in parentheses, in Roman numerals following the name of the transition metal.Fill in the missing information to complete the names of the coordination compounds/complexes shown below.
Why are prefixes not needed in naming ionic compounds?A.Roman numerals are used instead of prefixes to indicate number.B.Ion charges are written as superscripts with the names of the atoms.C.Ions combine in only one ratio.D.Subscripts are used in the name to indicate number of atoms.
Roman numerals are represented by seven different symbols: I, V, X, L, C, D and M.Symbol ValueI 1V 5X 10L 50C 100D 500M 1000For example, 3 is written as III in Roman numeral, just three ones added together. 12 is written as XII, which is simply X + II. The number 26 is written as XXVI, which is XX + V + I.There are six instances where subtraction is used:I can be placed before V (5) and X (10) to make 4 and 9.X can be placed before L (50) and C (100) to make 40 and 90.C can be placed before D (500) and M (1000) to make 400 and 900.Input FormatN, integerConstraints1 <= N <= 2000Output Formatset of charactersSample Input 03Sample Output 0IIISample Input 158Sample Output 1LVIIISample Input 21994Sample Output 2MCMXCIV
Name the following compound. If the cation requires an oxidation state (Roman numerals), then make sure you put the name of the cation and the Roman numerals without a space in between, like iron(II) or copper(I).NH4Cl
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