Scientists can use chemicals to clean toxins from the soil. What does this show about chemicals? A. All chemicals are harmful to the environment.
B. Scientists cannot predict the effect of chemicals on the environment.
C. Chemicals can be used to help the environment.
D. Scientists have to fix the problems they cause by adding chemicals to the environment .

Use a magnet to separate iron, evaporate water, i'm not sure how to separate the other two i'm sorry but good luck

Answer: temperature? i hope this and have a wonderful

Ans(15) minutes;

Electron equations of the given changes are as follow,a)                              cu      →      cu⁺²  + 2e⁻b)                              mg⁺²  +  2 e⁻      →      mgc)                              cl⁻    →      cl  +  1e⁻d)                              s  +  2 e⁻    →      s²⁻e)                                o²⁻      →      o  +  2 e⁻f)                              p  +  3 e⁻    →      p³⁻g)                              fe²⁺    →      fe³⁺  + 1 e⁻h)                              s²⁻    →      s⁴⁺  +  6 e⁻