Exam 1 CH 1010 Fall 2022September 26, 2022Answers & Explanations by Dr. Trey Williams1.Consider the substance water.Water is [acompound].options: an element, a compound, a mixtureThe smallest particles of the substance water are[molecules].3.A recycling plant needs to separate two typesof plastic: ABS, d = 1.15 g/mL and PET, d = 1.35g/mL. Would a solution of NaCl with a density of 1.05g/mL be able to separate them?options: atoms, molecules, ionsExplanation: Water cannot be separated intoseparate components physically, so it is not amixture: it is a pure substance. It can be brokendown chemically into separate elements (hydrogenand oxygen), so it is acompound.The smallest particles of water are calledmolecules. While each molecule is indeed made upof smaller particles (atoms), when it is split up
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those atoms are not water anymore, so the smallestsubdivision for it to still bewateris a molecule.2.The temperature of an object is [220]°C.What isthe temperature in Kelvin?Answer:A. No, the two plastics will not be separatedbecause both types would sink…Explanation: Substances float or sink in other fluidsbecause of the relative density. Having a higher densitymeans that an object will have more mass in the sameamount of volume, and therefore it will displace a fluidwith lower density and sink.
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