Chemistry

How many grams of KNO3 per 100g of water would be crystallized from a saturated solution as the temperature drops from:A. 80C to 20CB. 60C to 40CC. 50C to 30CD. 80C to 0CE. 50C to 10C
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which phase change will have a more dramatic increase in entropy? select the statement that best explains why.
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if a student reacts 4.40 ml of acetic acid with 3.35 ml of isopentyl alcohol and obtains 3.25 ml of isopentyl acetate as the product, what was the percent yield
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which period contains three elements that commonly exist as diatomic molecules at standard temperature and pressure conditions?
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A hot air balloon has a volume of 3100 m to the third at 91 degrees Celsius what is the volume if the air cools to 86 degrees Celsius
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magnesium chloride is a common deicer used to melt snow on the road in winter. what is the freezing point of a solution where 34.4 g of magnesium chloride is dissolved in 0.9 kg of water (kf
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would you expect the entropy of 1.00 moles of agcl added to 1.00 l of water to form agcl (aq) to be greater than, less than, or equal to the entropy of 1.00 moles of nacl added to 1.00 l of water to form nacl (aq)? explain your reasoning. (hint: think about your solubility rules)
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Given 30 grams NaBr how many grams of Cl2 are required to complete this reaction?2NaBr + Cl2 = 2NaCl + Br2
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how many moles of each reactant are needed to produce 3.60*10 to the power of 2 g ch3oh
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Which stage of mitosis is the easiest (in your opinion) to see on the slide? What about it makes it easy to identify?
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number of Li atoms in 4.5 mol of Li
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) your sample will not be useful to you after 95% of the radioactive nuclei present on the day the sample arrives have disintegrated. for about how many days after the sample arrives will you be able to use the polonium?
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superstition can only be used to explain rogue waves in what types of water
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Sheila spilled tea on her notes and is now unable to read some words.What is the correct title for this section of Sheila's notes?VolumeDensityWeightMass
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g if a chemical spill occurs in lab, the best step to take is...group of answer choicesimmediately use the safety showerimmediately let the instructor knowcover the spill with absorbent material such as paper towelsquickly rinse the area with as much cool water as possible
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what is the volume of 1.00 mole of H2
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2 nh3 3 cuo g 3 cu n2 3 h2o in the above equation how many moles of water can be made when 84 moles of nh3 are consumed?
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uestion 8 Calculate the percentage by mass of hydrogen in PtCl2(NH3)2 A. 1.558 B. 1.008 c.0.672 D. 0.034 E.2.016
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a solution at room tempearature with a ph of less than 7 will be: select the correct answer below: acidic basic neutral depends on the solutiona.Acidicb.Basicc.Neutrald.Depens on the solution
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trontium-90 has a half-life of 28.8 years. if you start with a 10 gram sample of strontium-90, how much will be left after 115.2 years?
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if the concentration of zn2 is 0.10 m, what concentration of cr3 should be used so that the overall cell potential is 0 v?
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if an isotope has a half-life of 4 billion years, then in 4 billion years what will happen? group of answer choices the original amount will have doubled. all of the original amount will still be present. all of the original amount will have decayed. half of the original amount will still be present.
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select the weakest reducing agent from the list of answer options. all species without a phase listed are aqueous. g ni(s) pb2 sn(s) al(s) cr2 zn(s)
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calculate the enthalpy change when 5 g of zinc metal is heated from 100oc to the point where the entire sample is melted. (the heat of fusion for zinc is 112.4 j/g and its specific heat capacity is 0.388 j/goc.)
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