Answers edited by Priya

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• 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?
  
• Why does neutralization occur?
  
• How is mass number related to isotopes?
  
• Question #6b0c2
  
• How many valence electrons does bromine have?
  
• 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?
  
• Question #94985
  
• Question #2f835
  
• What does a buffer do in a solution?
  
• What is an example of a VSEPR model practice problem?
  
• How do valence electrons form bonds?
  
• How do you determine the correct subscripts in a chemical formula?
  
• How can I calculate the molecular weight of the empirical formula?
  
• How do you find the molality of an unknown solution?
  
• Question #f6476
  
• 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 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?
  
• Question #f7c86
  
• Question #42ee6
  
• Question #d7f86
  
• How can the periodic table be used to predict the properties of the elements?
  
• Why are all spontaneous processes not exothermic?
  
• Why are atomic masses of most of the elements fractional?
  
• How does a galvanic cell differ from an electrolytic cell?
  
• Question #fee47
  
• Question #3c8f0
  
• Question #3e282
  
• What is half-life?
  
• Does positron decay result in nuclear transmutation?
  
• What temperature scale does Australia use?
  
• 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?
  
• How can I classify metalloids?
  
• What are the limitations of the octet rule?
  
• What is a linear regression?
  
• What is the balanced equation for combustions of propane gas that yields carbon dioxide and water?
  
• What is linear mass density?
  
• How can atomic emission spectra be useful?
  
• Question #14194
  
• What temperature scale does China use?
  
• How does ion size affect conductivity?
  
• How can I calculate percent concentration by mass?
  
• Does the Heisenberg uncertainty principle apply to cars and airplanes?
  
• 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?
  
• How many atomic orbitals are there in a p subshell?
  
• Is CH3CO2H a dipole dipole?
  
• How does Boyle's law relate to breathing?
  
• What sort of radiation can cause genetic mutations?
  
• Question #d7f4a
  
• How does counter-current mechanism in the Loop of Henle work?
  
• How can a chemical change be sped up?
  
• What is an example of a percent composition practice problem?
  
• Question #bb7b1
  
• How can molarity and osmolarity be calculated from m/v?
  
• How do covalent bonds dissolve in water?
  
• How do oxidation numbers relate to electron configuration?
  
• Is the source of the sun's energy nuclear fusion or nuclear fission?
  
• How does multigrade oil work?
  
• What is the oxidation state of chromium in Cr(H2O)6 (3+)?
  
• Question #c5be6
  
• 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?
  
• 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 does solubility change with temperature changes?
  
• How many hybrid orbitals are present in the molecule PCl5?
  
• Is heat capacity larger for polymers?
  
• Question #c0638
  
• Calculate the number of joules given off when 32.0 grams of steam cools from 110.0 °C to ice at -40.0 °C.
  
• What causes gas pressure (in terms of kinetic theory)?
  
• Did Rutherford's gold foil experiment change the view of the atom?
  
• 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?
  
• How is nuclear stability related to the neutron-proton ratio?
  
• The temperature measured in an experiment was #"64.9"^@"C"#. The theoretical temperature is #"55.0"^@"C"#. What is the percent error?
  
• How can a galvanic cell become an electrolytic cell?
  
• How are atomic spectra used?
  
• 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?
  
• How does temperature affect changes of state?
  
• 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?
  
• What is osmolarity of body fluids?
  
• Question #bc74d
  
• What is a polyatomic ion?
  
• Why is the rate of reaction fastest at the beginning?
  
• How many bonding orbitals are in Silicon Tetraflouride, or #SiF_4#?
  
• Why are closed shells more stable?
  
• Question #25b41
  
• How many moles of sodium hydroxide are needed to neutralize 1 mole of phosphoric acid?
  
• How did Tycho Brahe and Kepler employ the scientific method?
  
• What is a reaction rate constant?
  
• How does the ideal gas law differ from the combined gas law?
  
• What's the mole number?
  
• What is the chemical equation for cesium + iodine ---> cesium iodide?
  
• What is an atom?
  
• In a double bond how many pi and sigma bonds are there?
  
• What is a formula that demonstrates the law of multiple proportions?
  
• What is a reaction rate?
  
• 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?
  
• Do relative osmolarities relate to water movement?
  
• What do you mean by the ground state of a system?
  
• How does the collision theory explain how chemical reactions occur?
  
• What covalent bonds are in sulfamic acid and water?
  
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