Answers edited by Priya

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• How do you find the molality of an unknown solution?
  
• How many bonding orbitals are in Silicon Tetraflouride, or #SiF_4#?
  
• How many atomic orbitals are there in a p subshell?
  
• Why are all spontaneous processes not exothermic?
  
• How do valence electrons form bonds?
  
• Does the Heisenberg uncertainty principle apply to cars and airplanes?
  
• Why is the rate of reaction fastest at the beginning?
  
• Calculate the number of joules given off when 32.0 grams of steam cools from 110.0 °C to ice at -40.0 °C.
  
• How can the periodic table be used to predict the properties of the elements?
  
• Why does neutralization occur?
  
• What is an example of a percent composition practice problem?
  
• How does counter-current mechanism in the Loop of Henle work?
  
• In a double bond how many pi and sigma bonds are there?
  
• What is the total gas pressure in a sealed flask that contains oxygen at a partial pressure of 0.41 atm and a water vapor at a partial pressure of 0.58 atm?
  
• What is osmolarity of body fluids?
  
• A sample of carbon is placed in a rigid 1.50 L flask. Dinitrogen monoxide is added and the flask heated to 800C. When the system reached equilibrium the partial pressure of the carbon dioxide is found to be 0.030 atm and the partial pressure of the dinitrogen monoxide to be 1.48 atm. What is the value of the equilibrium constant, Kp for the system at 800C?
  
• Why are atomic masses of most of the elements fractional?
  
• How does Boyle's law relate to breathing?
  
• How can molarity and osmolarity be calculated from m/v?
  
• How do you determine the correct subscripts in a chemical formula?
  
• How does a galvanic cell differ from an electrolytic cell?
  
• Question #6b0c2
  
• What is an example of a VSEPR model practice problem?
  
• Question #f7c86
  
• Question #3c8f0
  
• What do you mean by the ground state of a system?
  
• How many hybrid orbitals are present in the molecule PCl5?
  
• What is the oxidation state of chromium in Cr(H2O)6 (3+)?
  
• How do you calculate the number of days required for 3/4 of a given amount of nuclide to decay if the half-life is 18 point 72 days?
  
• How does the ideal gas law differ from the combined gas law?
  
• Is the source of the sun's energy nuclear fusion or nuclear fission?
  
• What is a reaction rate constant?
  
• What amount of ice must be added to 540.0 g of water at 25.0 °C to cool the water to 0.0 °C and have no ice?
  
• Why are closed shells more stable?
  
• How does temperature affect changes of state?
  
• Question #d7f4a
  
• How did Tycho Brahe and Kepler employ the scientific method?
  
• What is an atom?
  
• What does a buffer do in a solution?
  
• Question #25b41
  
• Question #bc74d
  
• Is heat capacity larger for polymers?
  
• How does multigrade oil work?
  
• Question #c5be6
  
• Question #42ee6
  
• Question #fee47
  
• How is nuclear stability related to the neutron-proton ratio?
  
• How does ion size affect conductivity?
  
• Did Rutherford's gold foil experiment change the view of the atom?
  
• How can I classify metalloids?
  
• How does the collision theory explain how chemical reactions occur?
  
• What is a reaction rate?
  
• What's the mole number?
  
• How are atomic spectra used?
  
• What temperature scale does China use?
  
• How many moles of sodium hydroxide are needed to neutralize 1 mole of phosphoric acid?
  
• What temperature scale does Australia use?
  
• A sample of carbon is placed in a rigid 1.50 L flask. Dinitrogen monoxide is added and the flask heated to 800C. When the system reached equilibrium the partial pressure of the carbon dioxide is found to be 0.030 atm and the partial pressure of the dinitrogen monoxide to be 1.48 atm. What is the partial pressure of nitrogen in the mixture.
  
• How many grams of NaCl are produced when 80.0 grams of O2 are produced? 2 NaClO3 ---> 2 NaCl + 3 O2
  
• What covalent compound is N2S?
  
• Question #c0638
  
• What is the balanced equation for combustions of propane gas that yields carbon dioxide and water?
  
• What are the limitations of the octet rule?
  
• What covalent bonds are in sulfamic acid and water?
  
• What is linear mass density?
  
• The temperature measured in an experiment was #"64.9"^@"C"#. The theoretical temperature is #"55.0"^@"C"#. What is the percent error?
  
• Does positron decay result in nuclear transmutation?
  
• How do covalent bonds dissolve in water?
  
• What is a linear regression?
  
• Question #bb7b1
  
• How does solubility change with temperature changes?
  
• What is the chemical equation for cesium + iodine ---> cesium iodide?
  
• What causes gas pressure (in terms of kinetic theory)?
  
• Do relative osmolarities relate to water movement?
  
• A certain sample of gas has a volume of 0.452 L measured at 87°C and 0.620 atm. What is its volume at 1 atm and 0°C?
  
• How can I calculate the molecular weight of the empirical formula?
  
• A sample of O2 under 2.00 atm occupies 500 ml at 25.0˚C. What temperature will be needed to produce a pressure of 4.00 atm?
  
• If 500 mL of HCl gas at 300 K and 100 kPa dissolved in pure water requires 12.50 mL of the NaOH solution to neutralize in a titration experiment, what is the concentration of the NaOH solution?
  
• Question #14194
  
• What is a polyatomic ion?
  
• How do you determine how much of the excess reactant is left over? Also, how do you determine how much MORE of the limiting reagent would you need to use up the excess?
  
• Question #94985
  
• How can a galvanic cell become an electrolytic cell?
  
• What is half-life?
  
• How can a chemical change be sped up?
  
• A sample of hydrogen has an initial temperature of 50.° C. When the temperature is lowered to -5.0° C, the volume of hydrogen becomes 212 cm3. What was the initial volume of the hydrogen in dm3?
  
• If 100.0 g of a radioactive isotope that has a half life of 25 years, identify the amount of that isotope that will remain after 100 years?
  
• How can I calculate percent concentration by mass?
  
• What is a formula that demonstrates the law of multiple proportions?
  
• Is CH3CO2H a dipole dipole?
  
• How many valence electrons does bromine have?
  
• Question #2f835
  
• What sort of radiation can cause genetic mutations?
  
• How is mass number related to isotopes?
  
• Question #3e282
  
• How can atomic emission spectra be useful?
  
• Question #f6476
  
• Question #d7f86
  
• How do oxidation numbers relate to electron configuration?
  
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