Answers edited by Priya

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