Answers edited by Priya

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