A chemist observed bubbling and fizzing after adding an acid solution to a white powdery substance in a beaker. Which of the following can be
inferred?

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 →

What is the independent variable in this investigation? mass volume sample number substance density

In salt water solution,the salt is the blank