Which statement describes only the quantum mechanical model of the atom? a) energy is quantized. eliminate b) has discrete energy levels. c) has sub levels within the energy levels. d) sometimes referred to as the "planetary" model.

Abeaker with 2.00×102 ml of an acetic acid buffer with a ph of 5.000 is sitting on a benchtop. the total molarity of acid and conjugate base in this buffer is 0.100 m. a student adds 4.70 ml of a 0.360 m hcl solution to the beaker. how much will the ph change? the pka of acetic acid is 4.740.

Find the mass, in grams, of 5.00*10^23 molecules of f2

Which liquid (h2o, h2o + soap, or h2o + salt) has the strongest cohesion and adhesion? (need now plz)