Why will frequency decrease when wave gets longer

Which of the following compounds does not contain molecules? question 2 options: co2 h2 nacl h2o

The number of neutrons is equal to the atomic number minus the atomic mass. a. true b. false

You dissolve 8.65 grams of lead(l) nitrate in water and then you add 2 50 grams of aluminum. this reaction occurs 2ai(s)+ 3pb(no3)2(aq) -3pb(s)+ 2aino3la(aq) the theoretical yield of solid lead?