For the fallowing pairs of solutions, write a molecular and net ionic balanced c
ID: 503159 • Letter: F
Question
For the fallowing pairs of solutions, write a molecular and net ionic balanced chemical equation for the formation of a precipitate. Include states of matter. Sodium hydroxide and lead(II) nitrate form lead(II) hydroxide Barium chloride and sodium sulfide form barium sulfide Sodium sulfate and silver nitrate form silver sulfate Potassium phosphate and nickel(II) chloride form nickel(II) phosphate Redox For the following reactions, identify the oxidation state of each element in each compound, and write the oxidation and reduction half reactions (focus on the atom changing oxidation state). 2 PH_3 + 4 O_2 rightarrow P_2 O_5 + 3 H_2 O Na_2 Cr_2 O_7 + s rightarrow Na_2 SO_4 + Cr_2 O_3 2 Al + 3 H_2 SO_4 rightarrow al_2 (SO_4)_3 + 3 H_2 4 FeCl_2 + O_2 + 4 HCI rightarrow 4 FeCI_3 + 2 H_2 O Light For the following wavelengths and frequencies, calculate the respective frequency or wavelength and the energy of a photon of this light. 4.34 * 10^-8 m 9.21 * 10^-15 m 1.35 * 10^-4 m 2.78 * 10^-10 m 1.35 * 10^-1 s^-1. 5.69 * 10^18 s^-1 8.75 * 10^23 s^-1 4.31 * 10^13 s^-1Explanation / Answer
1)
molecular equation:
2 NaOH (aq) + Pb(NO3)2 (aq) ------------------>Pb(OH)2 (s) + 2NaNO3 (aq)
net ionic equation:
Pb+2 (aq) + 2OH- (aq) -----------------------> Pb(OH)2 (s)
2)
molecular equation:
BaCl2 (aq) + Na2S (aq) ----------------------> BaS (s) + 2 NaCl (aq)
net ionic :
Ba+2 (aq) + S-2 (aq) --------------->BaS (s)
3)
molecular equation:
Na2SO4 (aq) + 2 AgNO3 (aq) ----------------------------> Ag2SO4 (s) + 2NaNO3 (aq)
net ionic :
2Ag+ (aq) + SO4-2 (aq) ------------------------> Ag2SO4 (s)
4)
molecular equation:
K3PO4 (aq) + NiCl2 (aq) -----------------------> Ni3(PO4)2 (s) + 6KCl (aq)
net ionic equation :
3Ni+2 (aq) + 2PO4-3(aq) ----------------------> Ni3(PO4)2 (s)