Answers edited by Priya

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• How do you determine the correct subscripts in a chemical formula?
  
• How can atomic emission spectra be useful?
  
• Question #3e282
  
• How is nuclear stability related to the neutron-proton ratio?
  
• Question #42ee6
  
• Question #bc74d
  
• How do oxidation numbers relate to electron configuration?
  
• Question #3c8f0
  
• 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?
  
• How do you find the molality of an unknown solution?
  
• Why are atomic masses of most of the elements fractional?
  
• Question #14194
  
• How many hybrid orbitals are present in the molecule PCl5?
  
• In a double bond how many pi and sigma bonds are there?
  
• 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?
  
• 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 are the limitations of the octet rule?
  
• How can a chemical change be sped up?
  
• 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 do covalent bonds dissolve in water?
  
• Why are all spontaneous processes not exothermic?
  
• 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?
  
• What is linear mass density?
  
• How does multigrade oil work?
  
• What is the balanced equation for combustions of propane gas that yields carbon dioxide and water?
  
• What is an atom?
  
• What do you mean by the ground state of a system?
  
• What is osmolarity of body fluids?
  
• What temperature scale does China use?
  
• 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 are atomic spectra used?
  
• How can the periodic table be used to predict the properties of the elements?
  
• How does Boyle's law relate to breathing?
  
• How do valence electrons form bonds?
  
• Question #6b0c2
  
• How does ion size affect conductivity?
  
• How is mass number related to isotopes?
  
• How can a galvanic cell become an electrolytic cell?
  
• What is a reaction rate?
  
• What's the mole number?
  
• What covalent bonds are in sulfamic acid and water?
  
• 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?
  
• Calculate the number of joules given off when 32.0 grams of steam cools from 110.0 °C to ice at -40.0 °C.
  
• Question #25b41
  
• Question #fee47
  
• What sort of radiation can cause genetic mutations?
  
• What is a formula that demonstrates the law of multiple proportions?
  
• Question #f7c86
  
• Question #94985
  
• How can molarity and osmolarity be calculated from m/v?
  
• What does a buffer do in a solution?
  
• Why does neutralization occur?
  
• Question #c0638
  
• How many valence electrons does bromine have?
  
• What is half-life?
  
• Does the Heisenberg uncertainty principle apply to cars and airplanes?
  
• What is an example of a percent composition practice problem?
  
• What covalent compound is N2S?
  
• What causes gas pressure (in terms of kinetic theory)?
  
• How did Tycho Brahe and Kepler employ the scientific method?
  
• How can I calculate the molecular weight of the empirical formula?
  
• 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?
  
• How does the collision theory explain how chemical reactions occur?
  
• Question #f6476
  
• What is a reaction rate constant?
  
• 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?
  
• How many moles of sodium hydroxide are needed to neutralize 1 mole of phosphoric acid?
  
• Did Rutherford's gold foil experiment change the view of the atom?
  
• How many atomic orbitals are there in a p subshell?
  
• Question #c5be6
  
• Does positron decay result in nuclear transmutation?
  
• What is a polyatomic ion?
  
• How does counter-current mechanism in the Loop of Henle work?
  
• Question #bb7b1
  
• Question #d7f86
  
• Is heat capacity larger for polymers?
  
• The temperature measured in an experiment was #"64.9"^@"C"#. The theoretical temperature is #"55.0"^@"C"#. What is the percent error?
  
• What is an example of a VSEPR model practice problem?
  
• How many grams of NaCl are produced when 80.0 grams of O2 are produced? 2 NaClO3 ---> 2 NaCl + 3 O2
  
• How does the ideal gas law differ from the combined gas law?
  
• 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 #d7f4a
  
• How does temperature affect changes of state?
  
• Why are closed shells more stable?
  
• How does a galvanic cell differ from an electrolytic cell?
  
• How can I classify metalloids?
  
• Why is the rate of reaction fastest at the beginning?
  
• What is a linear regression?
  
• Is the source of the sun's energy nuclear fusion or nuclear fission?
  
• Is CH3CO2H a dipole dipole?
  
• How many bonding orbitals are in Silicon Tetraflouride, or #SiF_4#?
  
• What is the chemical equation for cesium + iodine ---> cesium iodide?
  
• Do relative osmolarities relate to water movement?
  
• 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 solubility change with temperature changes?
  
• What is the oxidation state of chromium in Cr(H2O)6 (3+)?
  
• Question #2f835
  
• What temperature scale does Australia use?
  
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