Answers edited by Priya

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