An unknown radioactive sample is observed to decrease in activity by a factor of five in a two-hour period. What is the half-live t12

On a distance vs time graph the line of an object at rest is a

Describe in detail the melting point behavior of the 80: 20 benzoic acid-mandelic acid mixture

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 →