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Key Concepts Quiz


This activity contains 18 questions.

Question 1
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Which four elements are the primary components of important biological molecules, such as proteins, fats, and sugars?
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Question 2
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Trace elements _____.
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Question 3
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Which of the following molecules is a compound?
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Question 4
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An atom and an ion of the same element differ in the number of _____.
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Question 5
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Positron-emission tomography (PET) is a technique that doctors may use to _____.
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Question 6
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The periodic table of the elements shown below is organized into groups that possess similar chemical properties. The elements are organized into columns where the numbers of _____ are comparable.

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Question 7
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How are ionic bonds formed?
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Question 8
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Covalent bonds can occur where atoms share one or more pairs of electrons. Which of the following would form a double covalent bond?
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Question 9
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In hydrochloric acid (HCl), chlorine has greater electronegativity than hydrogen. Therefore, _____.
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Question 10
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Which of the following bonds are arranged from strongest to weakest in a biological system?
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Question 11
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What property of water is shown below.

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Question 12
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When hot, many mammals sweat to control their body temperature. Evaporation plays an important role, but the direct effect is due to _____.
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Question 13
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The hydrogen bonds in liquid water are less stable than ice. Why?
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Question 14
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Presume that water is H3O rather than H2O. How would this affect water's properties as a solute?
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Question 15
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The pH of human blood is maintained at around pH 7.4. Why does a buffer system need to be present in blood to protect against changes in pH due to increases in acids?
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Question 16
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Sulfur and nitrous oxides released into the atmosphere eventually result in acid precipitation. These compounds result from _____.
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Question 17
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It has been proposed that Mars harbors microbial life. Why?
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Question 18
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Chemical reactions do not create or destroy matter but simply rearrange it. Which example is the correct completed equation for this reaction?

4 NH3 + __ O2 yields.gif __ NO + __ H2O
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