Chemistry Homework Help: Answers & Questions Page 90

• How does hydrogen bonding contribute to water's high specific heat?

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• Hi, Why do some textbooks say that Avogadro's number is 602 sextillion ? I wrote out the full number and wrote the number above each set of zero's and it is 602 hexillion.

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• What is the difference between an ether and an ester?

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• How would you calculate the density of methanol (##CH_3OH##)?

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• How does the wave mechanical model of the atom differ from the bohr model?

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• Why is water considered to be a polar molecule?

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• A 51.24 g sample of Ba(OH)2 is dissolved in enough water to make 1.20 L of solution. How many mL of this solution must be diluted with water to make 1.00 L, of 0.100 M Ba(OH)2?

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• Glycogen b.Name the main enzyme of glycogenolysis and explain its function. c.Write the scheme of glucagon action (=signaling pathway) resulting in activation of thisenzyme?

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• What mass of ethane is contained 50 ml of 13.9% by mass solution of ethane in hexane? density of solution is .611 g/ml.

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• How is melting point related to the intermolecular forces of attraction?

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• At 25 degrees Celsius, by what factor is the rate increased by a catalyst that reduces the activation energy by 1.00 kJ/mol?

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• How many milliliters of 0.10 M ##"Pb"("NO"_3)_2## are required to react with 75 mL of 0.20 M ##"NaI"##?

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• What is the ground state electron configuration for Se2-?

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• Is H2S a lewis acid or a lewis base?

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• Is CH3CO2H a dipole dipole?

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• What is the boiling point of water in kelvins?

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• Why is oxygen difluoride polar?

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• NH4I (s) <==> NH3(g) + HI(g) A mass of 5 g of NH4I is sealed in a 2.00L flask and heated to 673K. If 2.56g NH4I(s) remain unreacted when the system has reached equilibrium, what is the equilibrium constant (Kp) for the reaction? (R = 0.0821)

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• What is the beta decay equation?

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• What is the atomic mass of nitrogen?

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• How many elements make up the lanthanide series?

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• Are triflate, tosylate and mesylate the only good leaving groups?

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• Draw the structural formula of methanal?

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• How do you convert 2.21 x 10 ^-4 dl into microliters?

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• Why are London dispersion forces weak?

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• What is the s,p,d,f configuration of Co?

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• The rate of effusion for ##H_2O## vs. ##H_2S## is______?

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• Label the acid-base and conjugate acid-base pairs? HCO3–(aq)+ H2O(l) ---->H2CO3(aq)+ OH–(aq)

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• In the following reaction, what mass of calcium carbonate, CaCO3, would be required to produce 881 L of carbon dioxide, CO2, measured at STP? (I dont understand where to begin...)

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• What is the formula for lithium sulfide?

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• Why are endothermic reactions useful?

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• How do you solve a gas law stoichiometry problem?

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• Calculate the number of oxygen atoms in 120.23 g of iron (II) phosphate, Fe3(PO4)2?

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• What is the approximate molecular mass of dry air containing 78% N2 and 22% O2? Explain stepwise.

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• What is the VSEPR model for ##N_2##?

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• What is the molar mass of (NH4)2CO3?

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• How are fusion and fission similar?

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• How is Charles' law different from Gay-Lussac's law?

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• In a vinegar and baking soda balloon experiment, which gas law is being demonstrated?

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• In electrolysis of water : 1.name the gas collected at the cathode and anode respectively? 2.how we will test this evolved gas ?

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• To bring 1.0kg of water from 25 c to 99c takes how much heat input? (in kilojoules)

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• What is pH of the solution? 120 mg Na2HPO4 and 100 mg of NaH2PO4 dissolved in 1 L of deionized water.

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• Assume for a moment that air consists of 80% nitrogen and 20% oxygen by volume. Using these three figures and typical values for temperature and pressure (1.000atm, 25 degrees C) calculate the density of air?

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• Combination reaction when nitrogen combines with hydrogen, ammonia is formed?

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• How can density be used to identify substances?

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• What is a compound, element, and mixture?

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• Is the caffeine molecule polar or non polar?

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• What are the reactants in this combustion reaction: ____ —> CO2 + 2H2O?

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• A calcium atom with a mass number of 46. What is the atomic symbol? Express your answer as an isotope.

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• why do we get red colour when we burned strontium chloride?

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