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EBK BIOLOGY TODAY AND TOMORROW WITHOUT
5th Edition
ISBN: 8220100557187
Author: STARR
Publisher: CENGAGE L
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Textbook Question
Chapter 2, Problem 3FIO
Figure 2.12 A pH scale.
Here, red dots signify hydrogen ions (H+) and blue dots signify hydroxyl ions (OH–). Also shown are the approximate pH values for some common solutions.
This pH scale ranges from 0 (most acidic) to 14 (most basic). A change of one unit on the scale corresponds to a tenfold change in the amount of H+ ions.
Photos, © JupiterImages Corporation.
Figure It Out: What is the approximate pH of cola?
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نقطة واحدة
The pH value is calculated
mathematically as the Log of the
* .hydrogen ion (H+) concentration
False
True O
an atom (to form cations) or adding electrons (to form anions). Ions are never formed by
1. It is important to recognize that ions are always formed by removing electrons from
a. There must be both positive ions (cations) and negative ions (anions) present.
2. It is very important to remember that a chemical compound must have a net charge
Read the following sentences.
changing the number of protons in an atom's nucleus.
of zero. This means that if a compound contains ions, then
a
Part I. For each of the following four questions: calculate and describe how the requested
solution would be made. Please show all of your calculations. In all cases the diluent or
solvent will be water. Also, assume the smallest volume you can accurately pipette is 1ul.
(CaClh: Molecular weight = 111.0 - NaCl: Molecular weight= 58.44)
1. From a 3M CaCh stock solution, you need to make 600 ml of 9 mM CaClh. Indicate how
you would make it.
2. You have a 20ul sample of DNA that you want to run in a gel. You are given 5X track
dye; how much track dye do you add to your sample so that the track dye concentration in
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3. You need to make 6 liters of 20% NaCl solution. Indicate how you wvould make it firom
powdered NACI.
Chapter 2 Solutions
EBK BIOLOGY TODAY AND TOMORROW WITHOUT
Ch. 2 - A. The first shell corresponds to the first energy...Ch. 2 - B. A chlorine atom (Cl) becomes a negatively...Ch. 2 - Figure 2.12 A pH scale. Here, red dots signify...Ch. 2 - Figure 2.17 Fatty acids. Double bonds in the tails...Ch. 2 - Effects of Dietary Fats on Lipoprotein Levels...Ch. 2 - Effects of Dietary Fats on Lipoprotein Levels...Ch. 2 - Effects of Dietary Fats on Lipoprotein Levels...Ch. 2 - Prob. 1SQCh. 2 - Which element has only one proton?Ch. 2 - The mutual attraction of opposite charges holds...
Ch. 2 - A salt does not release __________ in water. a....Ch. 2 - A(n) _______ substance repels water. a. acidic b....Ch. 2 - When dissolved in water, a(n) _____ donates H+ and...Ch. 2 - _________ is a monosaccharide. a. Glucose b....Ch. 2 - Unlike saturated fatty acids, the tails of...Ch. 2 - Which of the following is a class of molecules...Ch. 2 - Prob. 10SQCh. 2 - Prob. 11SQCh. 2 - Prob. 12SQCh. 2 - Prob. 13SQCh. 2 - Match the molecules with the best description.Ch. 2 - Match each molecule with its component(s).Ch. 2 - Alchemists were the forerunners of modern-day...Ch. 2 - Prob. 2CTCh. 2 - Polonium is a rare element with 33 radioisotopes....Ch. 2 - In the following list, identify the carbohydrate,...
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