Answers edited by dwayne

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• A sample of rhenium (Re) is #"37.40% Re-185"# and #"62.60% Re-187"#. What are the atomic masses of these isotopes? The sum of the masses of the two isotopes is #"371.9087 u"#. Find the mass of the individual isotopes.
  
• Question #307a5
  
• How do you convert Benzaldehyde to Benzophenone in exactly two steps?
  
• Question #7a6ab
  
• What are strong and weak acids?
  
• How do you work out the percentage of each element in sodium hydrogen sulfate ?
  
• Question #76b1a
  
• How does specific heat change with temperature?
  
• Can velocity be zero if accelerating?
  
• What is the molecular geometry of BrF4- ? A) square planar B) square pyramidal C) seesaw D) tetrahedral
  
• If a concave mirror with a focal length of 10.0 cm creates a real image 30.0 cm away on its principal axis, how far from the mirror is the corresponding object?
  
• What is the difference between STP and NTP?
  
• How does solubility affect boiling point?
  
• Question #e47c7
  
• What are some examples of polar molecules?
  
• Why are s orbitals non directional?
  
• How many p-orbitals are occupied in a N atom?
  
• What careers use polar coordinates?
  
• How do you find the derivative of #y=tan^2(5x)# ?
  
• Oxygen gas is at a temperature of 40°C when it occupies a volume of 2.3 liters. To what temperature should it be raised to occupy a volume of 6.5 liters?
  
• How does the formation of ions in solution affect entropy?
  
• What pieces of information from the periodic table are needed for isotope notation?
  
• What are some examples of a coefficient of restitution?
  
• If the absolute pressure of a gas is 550.280 kPa, what is its gage pressure?
  
• Why is radioactive decay measured in half-life instead of the full time?
  
• How can I calculate the amount of matter in a given volume?
  
• Question #1548e
  
• How do fermentation and anaerobic respiration differ?
  
• What is the molarity of #"19.00 cm"^3"# of glacial acetic acid at #"25"^@"C"#?
  
• How can I identify the limiting reactant when 43.25 g of cac2 reacts with 33.71 g of water to produce ca (oh) to and c2h2?
  
• How do I use matrices to solve the system #2x+3y=4# and #5x+8y=11#?
  
• How do oxidation numbers relate to electron configuration?
  
• Why is a fork a wedge?
  
• Question #5a15a
  
• What causes gas pressure (in terms of kinetic theory)?
  
• Question #1adf2
  
• 2 C8H18(l) + 25 O2(g) #-># 16 CO2(g) + 18 H2O(g) If you burned one gallon of gas (C8H18) (approximately 4000 grams), how many liters of carbon dioxide would be produced at a temperature of 21.0°C and a pressure of 1.00 atm?
  
• Based on the postulates of the kinetic molecular theory, what conditions of pressure and temperature would cause a real gas to best simulate an ideal gas?
  
• Is I-131 more likely to undergo beta-decay or positron-decay?
  
• What is the change in length of an object when it undergoes a temperature change related to?
  
• What are the applications of displacement reactions?
  
• Which Gas Law is involved when a balloon pops after sitting on it?
  
• How do you predict the products in acid-base reactions?
  
• Question #fb1f7
  
• If the average adult is to exhale #"1.0 kg"# of #"CO"_2#, how much glucose was involved?
  
• Question #ae5bd
  
• What happens to the angle of refraction as the angle of incidence increases?
  
• How do you know which ideal gas constant to use?
  
• Question #b7094
  
• Question #c9625
  
• How do you calculate mole fraction of solute?
  
• How do valence electrons affect chemical bonding?
  
• What are some examples of concave lenses?
  
• How do prokaryotic and eukaryotic cells differ?
  
• 0.465 g sample of an unknown compound occupies 245 mL at 298K and 1.22 atm. What is the molar mass of the unknown compound?
  
• Question #e61be
  
• Is SO2 a liquid, a solid, or a gas at room temperature?
  
• A sample of aluminum oxide has a mass of #"6.67 g"#. It was found to contain #"4.78 g Al"#. What is the percent composition of aluminum in the sample?
  
• Question #75e1d
  
• If a radioactive Isotope has a half life of 30 days then how long will it take 1000 grams to decay to 120 grams?
  
• What is an example of entropy from everyday life?
  
• Question #2849f
  
• Question #c9dab
  
• What amount of energy is used when 33.3 grams of ice at 0.00 °C is converted to steam at 150.0 °C?
  
• How is Hess's law applied in calculating enthalpy?
  
• Question #85471
  
• How are monomers, polymers and macromolecules related?
  
• Question #afc26
  
• Question #3c9f7
  
• What did Millikan's oil drop experiment reveal about the nature of electric charge?
  
• How can I write the formula for aluminum oxide?
  
• Can you find the number of moles of Argon in 607 grams of Argon?
  
• Question #9f50d
  
• Can you explain Gay Lussac's law in terms of the kinetic molecular theory?
  
• What is the ionic compound containing beryllium and oxygen?
  
• Question #37681
  
• According to Avogadro's law, as the number of moles of gas increases, what happens to its volume?
  
• How does gel electrophoresis relate to DNA fingerprinting?
  
• How can I write the formula for calcium nitride?
  
• How can I draw the structures of the two enantiomers of alanine?
  
• How do decomposition reactions differ from synthesis reactions?
  
• The noble gas xenon forms several compounds (usually involving oxygen or fluorine), but neon, which is also a noble gas, doesn't form compounds. Why? Why couldn't Ne form NeF4 in a similar way to XeF4?
  
• If the radius of a sphere is increasing at a rate of 4 cm per second, how fast is the volume increasing when the diameter is 80 cm?
  
• Question #0c88c
  
• How can the concentration of a solution be increased?
  
• How many grams of aluminum are required to react with 35 mL of 2.0 M hydrochloric acid, HCl? __ HCl + __ Al
  __ AlCl3 + __ H2
  
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