Biological Science

Chapter 2: The Atoms and Molecules of Ancient Earth

Figure Review

This is an on-line version of the green Figure Review questions and exercises included with many of the figures in your textbook. Each question includes the figure number from the book to help you complete the requested task. Use this version to quickly and easily submit your work to your instructor or teaching assistant.

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Figure 2.2
Suppose you needed to determine the age of a rock. According to the data you've collected, the ratio of a certain parent isotope to daughter isotope is about 3:97. The half-life of the isotope is 10 million years. How old do you estimate the rock is?  

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

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Figure 2.3
The researcher who did this work claims the organism lived in marine environments. What basis does he have for making this claim?  

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

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Figure 2.4
For each of the highlighted atoms, write down the number of bonds it is capable of forming (based on the number of unpaired electrons in its outer shell).  

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

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Figure 2.6
How do the electron configurations of H, C, O, and N in these molecules compare with their configurations shown in Figure 2.4b?  

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

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Figure 2.7 On figure 2.7 in your textbook (page24) Label which molecule is bent and planar, which forms a tetrahedron, and which forms a pyramid.  

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

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Figure 2.12 Using the data in the top part as a guide, to the figure in your textbook (page 31) add dots to each covalent bond in the equation to show the relative positions of the electrons involved. Which molecule is reduced and which is oxidized?  

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

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Figure 2.15
Label the hydrogen bond of figure 2.15 on page 32 of your textbook. With regard to the existence of life, how important are hydrogen bonds?  

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

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Figure 2.18 Ionic bonding can be thought of in terms of reduction and oxidation. On figure 2.18 of your textbook (page 37) label which reaction results in reduction and which results in oxidation.  

To create paragraphs in your essay response, type <p> at the beginning of the paragraph, and </p> at the end.

 




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