Miss rushing feels a balloon with hydrogen gasTo demonstrate its ability to burn combination what she used to produce the hydrogen she needs.

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 →

Can someone me with 1 to 4 plz. fast

When a spring is compressed, the energy changes from kinetic to potential. which best describes what is causing this change?