Answers edited by Priya

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