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Biological Science Study Set 3

Biology

Quiz 2 :

Water and Carbon: the Chemical Basis of Life

Quiz 2 :

Water and Carbon: the Chemical Basis of Life

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An atom has four electrons in its valence shell. What types of covalent bonds is it capable of forming?
Free
Multiple Choice
Answer:

Answer:

C

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You need to write down information about a molecule that gives the most accurate picture of the relative sizes of the atoms involved and their relationship in space. Which representation would work best?
Free
Multiple Choice
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Answer:

A

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If an atom has a charge of - 2, which of the following must be true?
Free
Multiple Choice
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Answer:

C

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The structural formula for a certain molecule includes a group symbolized - O. The dash next to the oxygen atom means that a single bond exists to another atom, such as a carbon. Based on the valence of oxygen and the number of bonds it normally forms, what is the charge on the oxygen atom in this case?
Multiple Choice
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You need to write down information about a molecule, but need to indicate only which atoms it contains and how many of each. Which representation would work best?
Multiple Choice
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How many electrons are involved in a double covalent bond?
Multiple Choice
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When the atoms involved in a covalent bond have the same electronegativity, what type of bond results?
Multiple Choice
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Nitrogen N) normally forms only three covalent bonds because it has a valence of five. However, ammonium has four covalent bonds, each to a different hydrogen H) atom H has a valence of one). Make a sketch of this molecule. Count the number of electrons in your sketch. Compare this number to the number of valence electrons in one N and four H's. What is the charge on this molecule most likely to be?
Multiple Choice
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What holds electrons in a covalent bond?
Multiple Choice
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If an atom has a charge of +1, which of the following must be true?
Multiple Choice
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The difference between a polar covalent bond and an ionic bond is that electrons are shared unequally in a polar covalent bond, but are completely transferred i.e., not shared) in an ionic bond.
True False
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When one of the atoms involved in a covalent bond has a much higher electronegativity than the other atom, what type of bond results?
Multiple Choice
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An atom has six electrons in its valence shell. How many single covalent bonds would you expect it to form in most circumstances?
Multiple Choice
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If an atom is electrically neutral, which of the following must be true?
Multiple Choice
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When are atoms most stable?
Multiple Choice
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How many electrons are involved in a single covalent bond?
Multiple Choice
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How many electrons are involved in a triple covalent bond?
Multiple Choice
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There are four elements that make up 95% of all matter found in organisms. Which of the following is not one of these?
Multiple Choice
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Why is water capable of forming hydrogen bonds?
Multiple Choice
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How can you determine the approximate mass of an atom in atomic mass units?
Multiple Choice
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