Chemistry Homework Help: Answers & Questions Page 55

• The atomic number of Uranium is 92 and its atomic mass is 238. How many neutrons does the most common isotope of Uranium have?

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• What major product results when 2-bromo-2-methylbutane is treated with sodium ethoxide?

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• Which parts of acetylsalicylic acid are rigid?

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• An aqueous solution of ##"HCl"## contains 36% ##"HCl"## by mass. The density of the solution is 1.189 g/ml. What is the mole fraction of ##"HCl"## in the solution ? What is the molality of ##"HCl"## in the solution ? Show all calculations

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• Why is NH3 a lewis base and BCl3 a lewis acid?

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• How do you recognize a double displacement reaction?

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• What is an f orbital?

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• How many properties of matter are there?

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• The half-life of plutonium-239 is 24,100 years. Of an original mass of 100g, how much plutonium-239 remains after 96,440 years?

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• What is the electron configuration of argon?

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• When HCl(aq) is titrated with NH3(aq), the pH at the equivalence point is (a) less than 7.0 (b) equal to 7.0 (c) greater than 7.0. ?

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• Why is the symbol of silver is Ag and not Si?

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• How do isotopes relate to average atomic mass?

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• How did we come to know the tetrahedral shape of methane, as it is gas and we can't look at its molecular level through microscope or any kind of such instrument? How were structures of other compounds, such as Nacl, determined?

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• How do you draw a Newman projection for hexane while sighting down ##C_2-C_3##?

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• Why does Sodium lose an electron and attains +1 charge?

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• What is the molar mass of methane, ##CH_4##?

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• What is vant Hoff equation ?

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• What is the hybridization of H2O?

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• In what order are the elements of the periodic table arranged?

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• What is the difference between alkanes, alkenes and alkynes?

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• How many hybrid orbitals are there in HNO3?

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• Why Polystyrene is foamy?

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• Why is there more than one definition of acid–base behavior?

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• How can I find the percent compositions of N2S2?

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• A Nitrogen atom with 7 protons and 8 neutrons has a mass number of 15 amu. However on the periodic table, the atomic mass for Nitrogen is 14.01. How is this possible?

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• What is the difference between accuracy and precision?

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• Why do primary alkyl halides generally undergo SN2 mechanisms?

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• What is the standard enthalpy of the reaction CO+H2O --> CO2+H2?

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• What products are fomed from when ethyl propanoate an ester of relatively low molecular weight is hydrolysed by aqueous sodium hydroxide ?

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• Methyl isonitrile, CH3NC, isomerizes when heated to give acetonitrile (methyl cyanide), CH3CN CH3NC (g) -> CH3CN (g) The reaction is first order. At 230 ºC, the rate constant for the isomerization is 6.3 x 10-4 /s. a) What is the half-life?

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• How many core electrons are in Iodine?

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• You count 74 CFU on a pour plate. The plate was prepared by spreading 0.2 mL of a 1:10,000 dilution of the original sample. What was the density of the original culture (in cells/mL)?

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• What is dissociation?

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• What are the three commonly used temperature scales and how are they different?

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• ##[Cr(NH_3)_6][(NO_3)_3]## Number of elements? Number of atoms per element? Total number of atoms in compound?

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• What is an experiment in that all factors are identical except the one being tested?

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• What is the molar mass of H20?

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• Why is HNO3 a strong acid?

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• Why is the ionization energy of neon higher than sodium in regards of periodicity?

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• Is salt an element, a compound, a homogenous mixture, or heterogeneous mixture?

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• What will be the atomic number of helium ion? 1 or 2?

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• What is the Lewis dot structure of ##BH_3##? How many lone pair electrons are in this molecule? How many bonding pairs of electrons are in this molecule? How many lone pair electrons are at the central atom?

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• According to the following reaction, how many moles of Fe(OH)2 can form from 175.0 mL of 0.227 M LiOH solution? I have tried this a few times and not getting the correct answer of 1.99x10(-2) moles. I started with 0.277 M LiOH/0.175L.

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• What are some examples of valence electrons?

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• How many moles are there in 28 grams of ##CO_2##?

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• Can anyone explain me the amphoteric nature of water?

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• What's the difference between the formula of acetate and ethanoate?

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• What is t-butyl chloride?

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• The Empire State Building has a height of 1250 ft. What is this height in meters, in scientific notation with three significant figures?

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