As I'm getting to know my students, I have made some adjustments. I've made a ton of adjustments. My Algebra 1 students this year seem to be at a lower level than last year's students.
Chapter 3. Composition of Substances and Solutions 3. Understanding the relationship between the masses of atoms and the chemical formulas of compounds allows us to quantitatively describe the composition of substances.
Formula Mass In an earlier chapter, we described the development of the atomic mass unit, the concept of average atomic masses, and the use of chemical formulas to represent the elemental makeup of substances.
Formula Mass for Covalent Substances For covalent substances, the formula represents the numbers and types of atoms composing a single molecule of the substance; therefore, the formula mass may be correctly referred to as a molecular mass. The molecular formula of chloroform indicates that a single molecule contains one carbon atom, one hydrogen atom, and three chlorine atoms.
The average molecular mass of a chloroform molecule is therefore equal to the sum of the average atomic masses of these atoms. Figure 1 outlines the calculations used to derive the molecular mass of chloroform, which is Figure 1.
The average mass of a chloroform molecule, CHCl3, is The model shows the molecular structure of chloroform.
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Likewise, the molecular mass of an aspirin molecule, C9H8O4, is the sum of the atomic masses of nine carbon atoms, eight hydrogen atoms, and four oxygen atoms, which amounts to Figure 2. The average mass of an aspirin molecule is The model shows the molecular structure of aspirin, C9H8O4.
Example 1 Computing Molecular Mass for a Covalent Compound Ibuprofen, C13H18O2, is a covalent compound and the active ingredient in several popular nonprescription pain medications, such as Advil and Motrin. What is the molecular mass amu for this compound?
Solution Molecules of this compound are comprised of 13 carbon atoms, 18 hydrogen atoms, and 2 oxygen atoms. Following the approach described above, the average molecular mass for this compound is therefore: Check Your Learning Acetaminophen, C8H9NO2, is a covalent compound and the active ingredient in several popular nonprescription pain medications, such as Tylenol.
The formula mass for an ionic compound is calculated in the same way as the formula mass for covalent compounds: The formula mass for this compound is computed as Figure 3.
Table salt, NaCl, contains an array of sodium and chloride ions combined in a 1: Its formula mass is Note that the average masses of neutral sodium and chlorine atoms were used in this computation, rather than the masses for sodium cations and chlorine anions. This approach is perfectly acceptable when computing the formula mass of an ionic compound.
Even though a sodium cation has a slightly smaller mass than a sodium atom since it is missing an electronthis difference will be offset by the fact that a chloride anion is slightly more massive than a chloride atom due to the extra electron.Page 1 of NextPostsCategory: Goal Setting Worksheet0 Elements Compounds & Mixtures Worksheet10 Ohm's Law Worksheet Answers11 Behavior Of Gases Worksheet11 Chemistry Worksheet Matter # Va Irrl Worksheet12 Cell Differentiation Worksheet Answer Key13 Newton's Laws Worksheet Answers14 Underground Railroad Worksheet15 5th Grade Grammar Worksheet15 Biodiversity Worksheet .
Everything a teacher needs to supplement math materials. Use these free math worksheets for homework assignments and to reinforce concepts, skills, and problem-solving. Not Boring! Chemistry Semester 1 Review A combination of units, symbols, and solving processes for the Semester 1 chemistry final exam.
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Scroll down for instructions on how to access those materials. DESCRIBING CHEMICAL CHANGE On May 6, , the huge airship Hindenburg v/as heading Many of the symbols commonly used in writing chemical equations are listed in Table on the following page.
section Balancing Chemical Equations You can write word equations similar to chemical equations for many.