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Whats the best way to learn chemistry? Does the fact that Earth has 4 seasons help or hinder the development of life on Earth. Why or why not? An organic liquid has a refractive index of 1.3859 at 25.5 c. what is the refractive index at 20 c? If F1(x) is the inverse of F(x), what is the value of F1(F(x)) ? 0, 1 , x-1, or x ?? HELPP PLEASE !!!!? Does Fe3+ react with MnO4- why or why not? If yes what would be the equation?