A student adds a few drops of phenolphthalein to a clear solution and it imediately turns pink (fuschia). Next, the student starts adding a second clear solution to the pink soluton and it slowly turns back to a clear colorless solution. What was the identity of the second solution that was added?

1. combine iron and copper (ii) sulfate solution. (hint: iron will form the iron (iii) ion) fe + cuso4 → 2. combine lead (ii) nitrate and potassium iodide solutions. pb(no3)2+ kl → 3. combine magnesium metal and hydrochloric acid solution. mg + hcl → 4. electrolysis (splitting) of water. h2o → 5. burning magnesium. mg + o2 →

Which of these conditions most likely produces an unstable isotope?

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