Answers edited by anor277

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• What do the different bands of colour represent on a chromatograph?
  
• How do we know which ions each element forms? And how do assign charges in complex ions?
  
• Why is it easy to work with normality than molarity? Can someone explain this question to me, preferably with an example?
  
• Which pH paper and pH meter that are used for detect the pH of oil?
  
• Why is mercury now seldom seen in laboratories?
  
• What is formal charge?
  
• If I have #6.022xx10^23# individual #""^1H# atoms, what MASS do I have?
  
• Do full valence shells always result in a formal charge of zero?
  
• Can you give FIVE examples of supersaturated solutions?
  
• What is stoichiometry? Can you explain the concept?
  
• In the U.S., the emissions limit for carbon monoxide in motorcycle engine exhaust is 12.0 g CO per km driven. What is this limit expressed in milligrams per mile (mg/mi)?
  
• For what does #pH# stand?
  
• Are nitrates safe materials?
  
• Why are some spectra more complicated than others?
  
• How do you determine non equivalent hydrogens?
  
• Why is ionic solid non-conductive, yet its solutions in water, or in the liquid state, it carries a charge?
  
• How can I illustrate Markovnikov's rule by the reaction of propene with hydrobromic acid?
  
• What are the guidelines to read skeletal-line structures?
  
• What is stoichiometry with acid and base dissociation?
  
• Question #c2c85
  
• How are physical changes different from chemical changes?
  
• What are the typical conservation laws, and how do they apply to everyday life?
  
• What is the solubility of zinc hydroxide in aqueous solution if #pH=9#?
  
• Question #0de88
  
• How does #"Avogadro's number"# relate to the atomic mass of #""^12C# isotope?
  
• Does sodium chloride undergo chemical reaction with water?
  
• Why is fixation of nitrogen important? How did this effect Germany, particularly, in the early 20th century?
  
• Why are there three moles of oxygen in one mole of potassium nitrate?
  
• Why are helium and neon gases called #"inert gases"#?
  
• Is #"HCl"# a strong acid? What about #"HF"#?
  
• Why is it always necessary to maximize yield in a chemical reaction?
  
• How does metallic bonding contribute to a metal’s malleability?
  
• What is the difference between qualitative and quantitative?
  
• What is #pH#?
  
• Combustion analysis of a 31.472 mg sample of the widely used flame retardant Decabrom gave 1.444 mg of #CO_2#. Is the molecular formula of Decabrom #C_12Br_10O# or #C_12H_10O#?
  
• Question #b0edb
  
• How do chromium metal, and #Pb^(2+)# interact electrochemically?
  
• What is an alkoxy group?
  
• Question #7c173
  
• How can we benefit from chemistry?
  
• Why are ideas on the nature of matter different from those held 200 years ago, and different from those held 2500 years ago?
  
• What are three consecutive integers whose sum is #-114#?
  
• How to know covalent bond with highest polarity?
  
• If the empirical formula is #C_2H_5#, and the molecular mass is #58*g*mol^-1#, what is the molecular formula?
  
• Please let me know which is more soluble in water 1-Octanol or 1,3-Propanediol, and please what is the reasons and explain. ?? Thank you
  
• The product of reacting an alkene with #"Br"_2(aq)# is #"C"_2"H"_4"BrOH"#. What is its name? Why is the product NOT a geminal dibromide?
  
• Why is chirality important in biochemistry?
  
• What reactions occur when...?
  
• Given #DeltaH_f^@# for #Al_2O_3#, how much aluminum is formed if #838*kJ# of energy are expended? #2Al(s) + 3/2O_2(g) rarr Al_2O_3(s)# #DeltaH^@=-1676*kJ*mol^-1#
  
• How are redox reactions involved in corrosion?
  
• What are possible structures for an organic molecule whose mass spectrum gives #m"/"z=128, 85, 71, 57, 43#?
  
• What factor determines electronegativity?
  
• What is thermochemistry?
  
• How does thermochemistry treat the making and breaking of chemical bonds?
  
• Which is molecular: xenon; argon; barium; iodine; potassium?
  
• In a #0.25*mol# quantity of #BaCO_3#, how many moles of oxygen atoms are present?
  
• Should a given object be more buoyant in liquid mercury than in liquid water?
  
• Given that the equilibrium...#4NH_3(g) + 3O_2(g)rarr2N_2(g) + 6H_2O(l) + Delta# is exothermic...what will be effect on the equilibrium if... #i.# #"Oxygen is removed;"# #ii.# #"Nitrogen is added;"# #iii.# #"Water is removed;"# #iv.# #"If heat is added?"#
  
• Write the structural formulae of the two isomers with the molecular formula #C_4H_8O# to illustrate functional group isomerism?
  
• In which of the given solutions with EQUAL concentrations will silver bromide be LEAST soluble?
  
• Is #H_3O^+# hard water? What occurs in an aqueous solution of acetic acid?
  
• Is petrol a reducing species?
  
• What is the #"molality"# of a #5.0*g# mass of toluene dissolved in #255*g# of benzene?
  
• Is the protonolysis reaction of sulfuric acid in aqueous solution an example of chemical change?
  
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