ichem pt 1

• change in color, temperature, odor, evolution of gas, and dis/appearance of solids is what type of change

  chemical change
• formula of % abundance


  atomic mass= mass of isotope 1(x) + mass of isotope 2(1-x)
• he postulated the energy emission of an electron from higher to lower energy level

  Bohr
• the formula of the kinetic energy of the ejected electron


  KE= hf - w (or BE; Binding energy)
• This equation is used to predict the (what kind of emission) of hydrogen-like atom

  Rydberg equation; UV-visible emission
• These are hydrogen-like atom except: H−, T(tritium atom), He+, Be3+

  H−
• formula of de Broglie wavelength 


   λ = h/mv
• release of proton formula (sa right side siya usually nilalagay)


  $^1p (subscript 1)$
• formula of activity 


  A= kN
• How to get k in A=kN ?

  k or λ= $ln 2/ (t1/2y)(365d)(24h)(3600s)$
• how to get N in A=kN?

  N= mass in g (given) / mass of radioactive X avo. number
• 1 disintegrate/sec in 1 Ci (curie)

  3.7x10^10 Ci ; 1 Bq= 1 disint./sec
• first order formula


  ln N/No = -kt
• half-life formula

  
  

  t1/2= ln2/k ; k=ln2/t1/2; ln2=kt1/2