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Electrons in Atoms and Molecules: Assessments
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[What I want to show is an electron cloud moving from one place to another because there is a hidden nucleus in another location. Qian how hard would it be to get a model or a movie here?]
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<strong><font color="#FFFFFF" size="5">Electrons in Atoms and Molecules:</font></strong><font color="#FFFFFF" size="5">
Assessment</font>
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<img src="electroncloud1.png">
<br>
</div>
<strong>1. Which of these images has a negative charge in the middle of an
electron cloud?)</strong>
</body>
</html>
<html>A</html>
<html>B</html>
<html>C</html>
<html>D</html>
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<strong>2. Considering the charges of the electrons in the cloud and the
nuclei, why do two atoms that have formed a covalent bond stay bound
together? </strong>
</body>
</html>
<html>Electrons that are paired are more energetically favored than electrons that are separate </html>
<html>The electrons from each atom are attracted to the protons from the other atom</html>
<html> A single electron cloud is more stable than two separate electron clouds</html>
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<body bgcolor="rgb(230, 230, 230)" marginheight="5" marginwidth="5" face="Arial">
<div align="center">
<img src="electroncloud3.png">
<br>
</div>
<strong>3. Which of these structures represents a nonpolar bond? Check all
that apply.</strong>
</body>
</html>
<html>A</html>
<html>B</html>
<html>C</html>
<html>D</html>
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<div align="center">
<img src="electroncloud4.png">
<br>
</div>
<strong>4. Shown above are 5 molecules with two atoms each. Each atom’s
nucleus is indicated by a plus sign ‘+’. The left atom on each of these
molecules is hydrogen. When comparing the electronegativities of all atoms
on the right side of these molecules, which one has the highest
electronegativity?</strong>
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</html>
<html>A</html>
<html>B</html>
<html>C</html>
<html>D</html>
<html>E</html>
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<body bgcolor="rgb(230, 230, 230)" marginheight="5" marginwidth="5" face="Arial">
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<img src="electroncloud5.png">
</div>
<strong>5. Which side of this triatomic molecule is going to be most
attracted to the positive side of a water molecule?</strong>
</body>
</html>
<html>A</html>
<html>B</html>
<html>C</html>
<html>D</html>
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<img src="electroncloud6.png">
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<strong>6.To which side of this molecule would the oxygen of a water
molecule be attracted?</strong>
</body>
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<html>A</html>
<html>B</html>
<html>C</html>
<html>D</html>
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<strong>7. Which of the following is true during ionization?</strong>
</body>
</html>
<html>The nuclear charge decreases</html>
<html>An electron is separated from an atom.</html>
<html>An electron is absorbed by the nucleus</html>
<html>Two electrons combine to form a stable union</html>
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<body bgcolor="rgb(230, 230, 230)" marginheight="5" marginwidth="5" face="Arial">
<strong>8. Which of the following concepts best explains the nature of an
electron around a nucleus? </strong>
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<html>Electrons orbit the nucleus in a well defined path much like planets orbit around the Sun</html>
<html>Electrons travel in a random, unpredictable manner at all points outside the nucleus of the atom.</html>
<html>Electrons travel mostly in a well defined area, but not with certainty at any particular point</html>
<html>Electrons orbit the nucleus in a probabilistic manner but only around the equatorial plane and not near the atom’s poles.</html>
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<strong>9.Which of the following best represents the size of atoms and
their particles? </strong>
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<html>Electrons are the smallest but take up the most space within an atom</html>
<html>Protons and neutrons are the smallest and take up the least amount of space within the atom</html>
<html>Electrons are the largest and take up the most space within an atom</html>
<html>Protons and neutrons are the largest and take up the most amount of space within the atom</html>
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<html>
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<body bgcolor="rgb(230, 230, 230)" marginheight="5" marginwidth="5" face="Arial">
<div align="center">
<img src="electroncloud10.png">
</div>
<strong>10. There is an anion (a negatively charged atom) in the vicinity
of this electron cloud. Which letter represents its most likely position?</strong>
</body>
</html>
<html>A</html>
<html>B</html>
<html>C</html>
<html>D</html>
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<div align="center">
<img src="electroncloud11.png">
</div>
<strong>11.The black dot at the center of this electron cloud represents a
particle. Which of the following is the most likely choice?</strong>
</body>
</html>
<html>Neutron</html>
<html>Proton</html>
<html>Electron</html>
<html>Anion</html>
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<strong>12. Click on Run and describe what is happening in this animation.
Understand that there may be hidden particles in this model.</strong>
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