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q showQuestions-3.php - The degree to which a substance...

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PS100 Questions from Chapter 21 Comprehension True/False Light can only be seen through very thin metal. true false Generally, MOs are low in energy because their electrons will be found between two nuclei. true false Compositions of alloys are generally fixed in simple ratios. true false For an alloy to form, the atoms must be different sizes. true false Often alloys are better conductors than either of the metals, in their pure form, that make up the alloy. true false Semi-metals are electrically conductive and have high melting points. true false Semiconductors and metals are very similar in the way each forms alloys. true false
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Matching Metal-metal compound. Electrons act like a lubricant between layers of nuclei. "Movement of electrons." An electron which is not focused around any one nucleus. Property of absorbing photons throughout the electromagnetic spectrum. Substances that conduct electricity better than insulators but not as good as conductors.
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Unformatted text preview: The degree to which a substance conducts heat. A measure for current flowing through a semiconductor. Nuclei surrounded by a "sea" of electrons. How easily light bounces off the surface of a substance. Analysis • Which of the following pairs of metal is most likely to form alloys of all compositions? 56 Ba and 31 Ga 50 Sn and 82 Pb 3 Li and 83 Bi • Which of the following pairs of metals is most likely to form alloys of all proportions? 55 Cs and 49 In 82 Pb and 19 K 37 Pt and 79 Au • Which of the following is NOT why alloys are useful to us today? Alloys have lower melting temperatures. have a higher conductivity rate. are less malleable. reduce weight in objects. • How do metals and semiconductors change with increasing temperatures? Metals become less resistive and semicoductors more resistive. Metals and semiconductors become less resistive. None of the above. Check Answers Choose a different chapter....
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