Search Results for: Chemical equation
6.3 Mole-Mass Conversions
Learning Objective Convert quantities between mass units and mole units. Example 3 in Section 6.2 “Atomic and Molar Masses” stated that the mass of 2 mol of U is twice the molar mass of uranium. Such a straightforward exercise does not require any formal mathematical treatment. Many questions concerning mass are not so straightforward, however, Read more »
6.1 The Mole
Learning Objective Define the mole unit. Figure 6.1 “Water Molecules” shows that we need 2 hydrogen atoms and 1 oxygen atom to make 1 water molecule. If we want to make 2 water molecules, we will need 4 hydrogen atoms and 2 oxygen atoms. If we want to make 5 molecules of water, we need Read more »
5.6 Redox Reactions in Organic Chemistry and Biochemistry
Learning Objective Identify oxidation-reduction reactions with organic compounds. Oxidation-reduction reactions are of central importance in organic chemistry and biochemistry. The burning of fuels that provides the energy to maintain our civilization and the metabolism of foods that furnish the energy that keeps us alive both involve redox reactions. All combustion reactions are also redox reactions. Read more »
5.5 Oxidation-Reduction (Redox) Reactions
Learning Objective Identify a chemical reaction as an oxidation-reduction reaction. It is fairly obvious that zinc metal reacts with aqueous hydrochloric acid! The bubbles are hydrogen gas. Source: Photo courtesy of Chemicalinterest,http://commons.wikimedia.org/wiki/File:Zn_reaction_with_HCl.JPG. When zinc metal is submerged into a quantity of aqueous HCl, the following reaction occurs (Figure 5.4 “Zinc Metal plus Hydrochloric Acid”): Read more »
Introduction
Opening Essay Although yeast has been used for thousands of years, its true nature has been known only for the last two centuries. Yeasts are single-celled fungi. About 1,000 species are recognized, but the most common species is Saccharomyces cerevisiae, which is used in bread making. Other species are used for the fermentation of alcoholic Read more »
3.3 Formulas for Ionic Compounds
Learning Objectives Write the chemical formula for a simple ionic compound. Recognize polyatomic ions in chemical formulas. We have already encountered some chemical formulas for simple ionic compounds. A chemical formula is a concise list of the elements in a compound and the ratios of these elements. To better understand what a chemical formula means, we Read more »
3.2 Ions
Learning Objectives Define the two types of ions. Use Lewis diagrams to illustrate ion formation. Most atoms do not have eight electrons in their valence electron shell. Some atoms have only a few electrons in their outer shell, while some atoms lack only one or two electrons to have an octet. In cases where an Read more »
1.7 Converting Units
Learning Objective Convert a value reported in one unit to a corresponding value in a different unit. The ability to convert from one unit to another is an important skill. For example, a nurse with 50 mg aspirin tablets who must administer 0.2 g of aspirin to a patient needs to know that 0.2 g Read more »
1.6 The International System of Units
Learning Objective Recognize the SI base units and explain the system of prefixes used with them. Now that we have discussed some of the conventions for expressing numbers, let us focus on the other component of a quantity—the units. People who live in the United States measure weight in pounds, height in feet and inches, Read more »
