Questions asked by Room 204

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• What is the difference between ethene , ethyne, ethylene and acetylene??? Thanks!
  
• How would you write the equilibrium constant expression for the following #H_2O_((g))# #rightleftharpoons# #H_2##(g)# #+# #1/2# #O_2##(g)# ?
  
• Why are concave mirrors are suitable for make up?
  
• Why is alcohol a good antiseptic at the cellular level?
  
• How to prove that #sin (pi/2 - theta)# = #cos theta# ?
  
• In a large ripple tank, a wave producing machine working at a frequency of 30 Hz produces 25 complete waves in a distance of 0.5 m. What would be the velocity of an individual wave? Thanks!
  
• Do all non-conductors of heat have a specific heat of zero?
  
• What is the immediate physiological effect of tobacco smoke on the lungs?
  
• What is the conventional ion notation? For example, how which of the following is correct?
  
• Solve the following by using the quadratic formula?
  
• How do I solve this exponential equation?
  
• If a sample contains #1.228*10^23# molecules of #"H"_2"SO"_4# then what is the mass of an individual #"H"^(+)# and #"SO"_4^(2-)# ion?
  
• What is the angle between two forces of equal magnitude, #F_a# and #F_b#, when the magnitude of their resultant is also equal to the magnitude of either of these forces?
  
• If a stone is dropped at an altitude of 174.9 m from a helicopter which is ascending with a velocity of 20.68 m/s, how long does the stone take to reach the ground?
  
• How do I prove and find the domain of the following trig identity?
  
• Using an ICE Table, how do we calculate #K_c# for the following reaction?
  
• What is the value of #(A #x# B)^2# + #(A * B)^2# ?
  
• A rectangular tank is filled to the brim with water. When a hole at its bottom is unplugged, the tank is emptied in time T. How long will it take to empty the tank if it is half filled?
  
• Does the electrolyte in a lead acid battery bubble and then evaporate due to the the heat change associated with the electrochemical reactions in the battery or is it something else?
  
• What are carbonate ions and how can you recognize them?
  
• What are carbonates and bicarbonates and why aren't they studied in organic chemistry?
  
• How does a step-up transformer, like the one used in a a battery-powered standby electrical system, not violate the Law of Conservation of energy when it changes 12V from a DC source to 110V of AC supply?
  
• How does yougurt turn sour when you put a metal spoon in it for too long?
  
• Why do cis isomers have higher melting points than trans isomers even though trans isomers are more stable?
  
• How do we find the range of the binary relation #4x^2 + 9y^2 = 36# ?
  
• How is #f'(x)=-x/sqrt(a^2-x^2# when #f(x)=a-sqrt(a^2-x^2# using the power rule ?
  
• Which sentence is grammatically correct? a) I buy gifts for my relatives **on** Christmas. b) I buy gifts for my relatives **at** Christmas.
  
• Should'nt the optimum pH of pancreatic amylase differ from that of salivary amylase?
  
• A cat sitting on top a train travelling north to south at a speed of #"70mph"# observes snow falling vertically downwards. In what direction will it be snowing for a dog sitting next to the train tracks?
  
• Of 10 senior citizens surveyed, 60% like chocolate icecream and 70% like strawberry icecream. What percentage of people like both chocolate and strawberry?
  
• If two waves, each of amplitude #z#, produce a resultant wave of amplitude #z#, then what is the phase difference between them? Is there a specific equation or formula I can use?
  
• At which depth will the glass, which is it not a right cylinder, be volumetrically half-filled? Assume that the thickness of the base is negligible and the thickness of the walls is constant.
  
• How would you find the period of #sin^2theta#?