Chemistry

still considering the t=0k limit, what fraction of the total number ntotal of free electrons in the metal will be at energies above the fermi energy?
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A risk assessment for a reaction should include the hazards associated with the: a. chemical reagents used. b. chemical products and by-products. c. procedures involved. d. All of the above.
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T/F Ironically customer complaints can sometimes result in improved customer service
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(a) Magellan's ships set sail with basic foods that provided a balanced diet.What is meant by a balanced diet?(b) Suggest why Magellan took some live animals with him on the voyage.(c) Most of the sailors on the Victoria developed a deficiency disease called scurvy.(I) What is meant by a deficiency disease?(lI) Describe one symptom of scurvy.(IlI) What is the cause of scurvy?(iv) Suggest why Elcaro did not develop this deficiency disease.
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To prepare a sample in a capillary tube for a melting point determination, gently tap the tube into the sample with the Choose... end of the tube down. Continue tapping until the sample Choose... Then, with the Choose... - end of the tube down, tap the sample down slowly or Choose... to move the sample down faster. Finally, make sure that you can see Choose... in the magnifier when placed in the melting point apparatus before turning on the heat.
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the volume of a sample of hydrogen gas at 0.997 atm is 5.00l. what will be the new volume if the pressure is decreased to 0.977 atm?
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Which of the following describes the net reaction that occursin the cell,Cd Cd?*(1 MI Cu?* (1 M) Cu?a. Cu + Cd?+ - Cu?+ + Cdb. Cu + Cd - Cu?+ + Ca?+ c. Cu?* + Cd?* - Cu + Cd d. Cu?* + Cd - Cu + Cd?*e. 2Cu+ Cd?+ > 2Cu* + Cd
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2. 5 mol of sodium chloride is decomposed into elements sodium and chlorine by means of electrical enegery. How much chlorine gas in grams is obtained from the process?
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suppose that placing 0.3 inch of lead in front of a gamma source reduces the count rate from 996 cps to 613 cps. what is -1m in g / cm2 ? the density of lead is 11.4 g / cm3 .
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Two angles lie along a straight line. If mA is five times the sum of mB plus 7. 2, what is mB?A horizontal line has a ray that extends up and right. The angle formed on the left of the ray is labelled A and the angle formed on the right of the ray is labelled B
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What do the sections between the lines on a phase diagramirepresent?A. The ranges where temperature and pressure are constant in asubstanceOB. The regions in which temperature and pressure change asubstance's phaseOC. The areas in which the kinetic energy of a substance is constantOD. The conditions in which a substance exists in a certain phase PREVIOUS
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Which statement must be TRUE for an electron transfer reaction to be energetically spontaneous? a. There must be a concurrent increase in entropy. b. The two groups involved in the electron transfer must be in direct contact. c. The change in reduction potential (AE.) must be negative. d. The change in reduction potential (AE) must be positive.
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determine the volume of 0.142 m naoh that is required to reach the stoichiometric point in the titration of 36 mL of 0.18 M C6H5COOH(aq). The Ka of benzoic acid is 6.5105.
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referring to the data in part ii what is different about the spectrum of light from an incandescent lamp when viewed through a solution of cuso4?
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how many calories are required to raise 125g of water from 24.0 oc to 42.5 oc?a) 9.68 x 103 cal. b) 2.31 x 103 cal. c) 1.25 x 102 cal. d) 1.44 x 102 cal.
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Students were asked to observe chemical reactions taking place and then record their observations in a data table. Which of the following observations could indicate a chemical reaction has occurred?a. a change in temperatureb. a change in colorc. the production of bubblesd. all of the above could indicate a chemical reaction has taken place
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Consider the reaction between sodium metal and chlorine gas to form sodium chloride (table salt): 2Na(s) + Cl2(g) 2NaCl(s) a) If 3.6 moles of chlorine react with sufficient sodium, how many grams of sodium chloride will be form?b) If 12.5 g of sodium react with sufficient chlorine, how many grams of sodium chloride will be form?
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which of the following correctly describe the fahrenheit and celsius temperature scales? (select all that apply.) multiple select question. A) The Celsius and Fahrenheit scales have the same zero point. B) Absolute zero is OK or -273.15C. C) Both the Kelvin and Celsius scales have the same size degree unit. D) All temperatures in the Kelvin scale (other than 0 K) are positive. E) A degree Celsius is the same size as a degree Fahrenheit.
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Identify the major ionic species present in an aqueous solution of FeCl3. A. Fe+, CI3- B. Fe3+, 3 CI-C. Fe2+, 3 C1- D. Fe+, 3C1-
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Considering the limiting reactant concept, how many moles of copper(I) sulfide are produced from the reaction of 1.00 mole of copper and 1.00 mole of sulfur?2 Cu(s) + S(s) Cu2S(s)a. 2.00 molb. 1.00 molc. 0.500 mold. 1.50 mole. none of the above
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the most polar molecule shown below is group of answer choices ncl3 bcl3 bf3 f2 cf4
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the existence of both metal-resistant and metal-sensitive alleles in this population of grasses is an example of selection due to heterogeneous environments.
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how many seconds are required to produce 4.00 g of aluminum metal from the electrolysis of molten alcl3 (aluminum chloride) with an electrical current of 15.0 a? [ a = c/s; f = 96 485 c/mol ]
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write a balanced nuclear equation for the following: the nuclide nitrogen-18 undergoes beta decay to form oxygen-18 .
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