Answers edited by Priya

• Back to user's profile
• Next
• How many grams of NaCl are produced when 80.0 grams of O2 are produced? 2 NaClO3 ---> 2 NaCl + 3 O2
  
• How do you determine the correct subscripts in a chemical 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 can I calculate the molecular weight of the empirical formula?
  
• How does temperature affect changes of state?
  
• How can the periodic table be used to predict the properties of the elements?
  
• 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.
  
• Why are all spontaneous processes not exothermic?
  
• How can a chemical change be sped up?
  
• What is a reaction rate constant?
  
• What is an example of a VSEPR model practice problem?
  
• What is the oxidation state of chromium in Cr(H2O)6 (3+)?
  
• Question #d7f4a
  
• What covalent bonds are in sulfamic acid and water?
  
• What do you mean by the ground state of a system?
  
• How many bonding orbitals are in Silicon Tetraflouride, or #SiF_4#?
  
• Question #c0638
  
• How can I classify metalloids?
  
• How does the collision theory explain how chemical reactions occur?
  
• How are atomic spectra used?
  
• 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?
  
• How does Boyle's law relate to breathing?
  
• 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 ion size affect conductivity?
  
• How many atomic orbitals are there in a p subshell?
  
• How do you find the molality of an unknown solution?
  
• What is a formula that demonstrates the law of multiple proportions?
  
• How do valence electrons form bonds?
  
• What does a buffer do in a solution?
  
• Question #f6476
  
• What causes gas pressure (in terms of kinetic theory)?
  
• How does a galvanic cell differ from an electrolytic cell?
  
• What is an example of a percent composition practice problem?
  
• 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?
  
• The temperature measured in an experiment was #"64.9"^@"C"#. The theoretical temperature is #"55.0"^@"C"#. What is the percent error?
  
• What temperature scale does China use?
  
• Question #fee47
  
• Question #14194
  
• How can a galvanic cell become an electrolytic cell?
  
• Is the source of the sun's energy nuclear fusion or nuclear fission?
  
• How does solubility change with temperature changes?
  
• What sort of radiation can cause genetic mutations?
  
• Question #d7f86
  
• How do covalent bonds dissolve in water?
  
• What is a linear regression?
  
• 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 #3e282
  
• What is osmolarity of body fluids?
  
• Is CH3CO2H a dipole dipole?
  
• Question #42ee6
  
• In a double bond how many pi and sigma bonds are there?
  
• Question #f7c86
  
• Did Rutherford's gold foil experiment change the view of the atom?
  
• 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 value of the equilibrium constant, Kp for the system at 800C?
  
• Question #bc74d
  
• Question #25b41
  
• What are the limitations of the octet rule?
  
• How many hybrid orbitals are present in the molecule PCl5?
  
• How is nuclear stability related to the neutron-proton ratio?
  
• Question #2f835
  
• How does counter-current mechanism in the Loop of Henle work?
  
• Calculate the number of joules given off when 32.0 grams of steam cools from 110.0 °C to ice at -40.0 °C.
  
• What is a polyatomic ion?
  
• How did Tycho Brahe and Kepler employ the scientific method?
  
• Why is the rate of reaction fastest at the beginning?
  
• What covalent compound is N2S?
  
• How do oxidation numbers relate to electron configuration?
  
• Why are closed shells more stable?
  
• 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 is an atom?
  
• What is linear mass density?
  
• Do relative osmolarities relate to water movement?
  
• Question #3c8f0
  
• How many moles of sodium hydroxide are needed to neutralize 1 mole of phosphoric acid?
  
• Does the Heisenberg uncertainty principle apply to cars and airplanes?
  
• How many valence electrons does bromine have?
  
• What is a reaction rate?
  
• Why are atomic masses of most of the elements fractional?
  
• How can atomic emission spectra be useful?
  
• Question #94985
  
• Question #6b0c2
  
• How can molarity and osmolarity be calculated from m/v?
  
• How can I calculate percent concentration by mass?
  
• 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 #bb7b1
  
• Does positron decay result in nuclear transmutation?
  
• What's the mole number?
  
• 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 half-life?
  
• 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 the chemical equation for cesium + iodine ---> cesium iodide?
  
• Question #c5be6
  
• What temperature scale does Australia use?
  
• How is mass number related to isotopes?
  
• How does multigrade oil work?
  
• Is heat capacity larger for polymers?
  
• How does the ideal gas law differ from the combined gas law?
  
• Why does neutralization occur?
  
• Next