Modified Mastering Biology With Pearson Etext -- Standalone Access Card -- For Biological Science (7th Edition)
7th Edition
ISBN: 9780135276556
Author: Scott Freeman, Kim Quillin, Lizabeth Allison, Michael Black, Greg Podgorski, Emily Taylor, Jeff Carmichael
Publisher: PEARSON
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Chapter 2, Problem 12PIAT
The salty ocean has a higher level of entropy compared to fresh water due to the dissolved ions it contains, which interact with and disperse water molecules. For ice to form in the ocean, this entropy must be reduced to allow the crystalline structure shown in Figure 2.15a to form. If you were to break off a piece of this ice and melt it, would the water taste fresh or salty? Explain your answer.
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A group of students designed an experiment to determine the impact of sucrose concentration on the weight of potato cubes. The pieces of potato were initially the same weight, shape, and size. Each potato piece was submerged into a beaker containing one of the sucrose concentrations for 30 minutes. The final weight of the potato was measured and recorded in the table.
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B
In the 1 mol/dm3 solution, the water molecules moved across a semi-permeable membrane to go from a lower solute concentration (the potato) to a higher solute concentration(the sucrose solution), leading to a decrease in weight of the potato.
C
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In Science experiments, it is very important to “control the variables” so that there is only ONE independent variable and ONE dependent variable. We “control the variables” by making anything else that could change during the experiment into a constant. For example, if you are doing an experiment to find out what material can hold more water, then it is important to make sure all the materials you are testing are the same size. Why is it so important to control the variables? What would happen if we did not control them?
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Chapter 2 Solutions
Modified Mastering Biology With Pearson Etext -- Standalone Access Card -- For Biological Science (7th Edition)
Ch. 2 - Which of the following occurs when a covalent bond...Ch. 2 - Prob. 4TYKCh. 2 - 5. Which of the following molecules would you...Ch. 2 - Locate fluorine (F) on the partial periodic table...Ch. 2 - Prob. 7TYUCh. 2 - Prob. 8TYUCh. 2 - From what you have learned about water, why do...Ch. 2 -
How do organisms survive below freezing...Ch. 2 - 12. The salty ocean has a higher level of entropy...Ch. 2 - Prob. 14PIAT
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- Which of the following is responsible for water exhibiting properties such as adhesion, co- hesion, and a high surface tension? A B с D covalent bonds between the constituent atoms presence of oxygen in the water molecule shape of the water molecule hydrogen bondingarrow_forwardWhich statement helps to explain why ice is less dense than liquid water? O(a) Water molecules make hydrogen bonds at definite angles. (b) Cold molecules move less than warm molecules. O (c) Hydrogen bonds lengthen in the cold. All of the above. O Both (a) and (b).arrow_forwardWhen a hydrophobic substance like a hydrocarbon is dissolved in water, a clathrate cage of ordered water molecules is formed about it. If we consider only the effects on water, what do you expect the sign of ∆S to be for this process? Explain your answer.arrow_forward
- A solution that conducts electricity must contain Select one: a. Hydrophobic molecules b. Polar molecules c. Ionsarrow_forwardPhospholipids will spontaneously form bubbles of bi-layer when put into water. Why do they do this? Why is this shape particularly energetically favorable?arrow_forwardWhen a hydrophobic substance like a hydrocarbon is dissolved in water, aclathrate cage of ordered water molecules is formed about it (as shown). If we consider only the effects on water, what do you expect the sign of ΔS to be for this process? Explain your answer.arrow_forward
- Name and explain four properties of water that support life.arrow_forwardtwo of these statements are truths and one is a lie. Which of the following statements is a lie? a. The concept of pH is exclusive of how buffers work. b. Salts dissociate into ions (except H+ and OH-) when dissolved in water. c. ATP stores a large amount of potential energy.arrow_forwardPrecipitation is one of the main processes involved in the water cycle. It involves the formation of water falling to the ground from cloids and transforming into either rain, snow sleet, or hail Which of the following properties of water can be used to explain why when water falls from clouds it is able to form a rain drop? O cohesive ability O universal solvent O expansion upon freezing O moderation of temperaturearrow_forward
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