15.05 x 10^23 molecules of NaNO3 are equal to how many moles

Which of the following pairs of elements belong to the same groupa. h and he b. li and bec. c and pb d. ga and ge

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 →

Use examples from the article to explain one positive and one negative effect that chemistry has had on society.