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Chemistry, 23.06.2019 05:00
110 g of water (specific heat = 4.184 j/g c) and 100 g of a metal sample (specific heat = 0.397 j/g c) are heated from 25 degrees c to 75 degrees c. which substance required more thermal energy?
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Chemistry, 23.06.2019 06:30
How can the number of core electrons be determined from the periodic table
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Chemistry, 23.06.2019 21:00
When preparing a tlc slide of a reference standard material (rsm), a solvent or mixture of solvents is used to dissolve the rsm and transfer it into the tlc plate. how does its polarity affects the rf of the rsm? the rf will increase depending of it polarity, but never decrease it does not affects it since the solvent evaporates before the insertion of the tlc slide in the jar a polar solvent will definitively reduce the retention factor a polar solvent will increase rf
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Chemistry, 24.06.2019 00:40
Ionic solids such as sodium chloride are easily shattered, but metallic solids such as copper can be easily bent and shaped. this difference occurs because a. ionic solids have low melting points b. atoms in metallic solids are not arranged in a regular pattern c. covalent bonding between sodium and chlorine keeps the solid rigid d. mobile electrons in the copper can shift without disrupting the solid
Answers: 1
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