Questions asked by JustMe314

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• Does #Fe# react with concentrated #H_2SO_4#?
  
• How can I oxidize #sf{Fe(OH)_2}# to #sf{Fe(OH)_3}#?
  
• How can I get #"Fe"_2"O"_3# and #"FeO"# from #"Fe"#?
  
• How do I balance this equation using the "half reaction" method: #CH_4+O_2+H_2O=CO+CO_2+H_2# ?
  
• Could someone give me a list of precipitates for the following ions : #Hg^+,Hg_2^{2+},Cr^{2+},Cr^{3+},Mn^{2+,3+,4+,5+,6+,7+},Co^{2+,3+},Ni^{2+,3+}#(the list must include the precipitate's colour too) ?
  
• Why does Na2CO3 react with CaCl2 , but NaHCO3 doesen't?
  
• Write a comment about the following quote : "Writing a book is like clock making"(at least 100 words) ?
  
• 1)Calculate the pH of a 0.1M solution of NaOH ,knowing that the volume of the solution is 300mL. 2)Calculate the pH of a 0.3M solution of HCl , knowing that the volume of the solution is 250mL (?)
  
• The pH of a 2M solution of NaOH is...? (please include the complete solution of the problem)
  
• How does a resistor convert electricity into heat?
  
• What's the geometry of the #Ag_8GeS_6# molecule?
  
• Considering there is no friction , find the minimum angle #\alpha# for which the ball gets out of the hole.(answer: #\alpha=60# ; I want to know the full solution) (?)
  
• Show that the surface of a sphere can't be represented as a plane (?)
  
• Help me please! (?)
  
• Calculate the last 2 digits of the sum : S=1!+2!+3!+...+2015! (n!=1*2*3*...*n) (?)
  
• Equilibrium problem about sulfurous acid?
  
• Using +,-,:,* (you have to use all of the signs and you are allowed to use one of them twice ; also you are not allowed to use brackets) , make the following sentence true: 9 2 11 13 6 3=45 ?
  
• Why are organic reactions slower than most inorganic reactions?
  
• Hi!Could someone help me?
  
• Let there be the function #f(alpha)= (L( v_a - v_0 sin alpha))/(v_0 cos alpha)# Where #L# ,#v_a# and #v_o# are constants. Determine #alpha# such that #f(alpha)# is minimal ?
  
• 200 mL of 0,1M NH4OH are mixed with 200mL of 0,1M NH4Cl. What is the pH of the final solution? #K_b=1,8*10^{-5}# (The answer given by the authors pH=9,3)
  
• What is the pH of a 1M HCN solution , #Ka=10^{-10}#?
  
• Which has a more pronounced ionic character FeCl2 or FeCl3? Fe+6 is ionic or has a more pronounced covalent character?
  
• Can somebody explain me what are the vacant 3d orbitals of silicon? Silicon configuration is 1s2 2s2 2p6 3s2 3p2 Where are the d orbitals?