Which of the following is an example of a molecule with different atoms? Question 6 options:

hydrogen - H2

water - H2O

oxygen - O2

helium - He

Which statement best describes the oxidation numbers of the atoms found in magnesium chloride? a. magnesium has a 2- oxidation number and chlorine has a 1+ oxidation number. b. magnesium has a 2- oxidation number and chlorine has a 2+ oxidation number. c. magnesium has a 2+ oxidation number and chlorine has a 1- oxidation number. d. magnesium has a 1+ oxidation number and chlorine has a 1- oxidation number.

12. calculate the hydroxide ion concentration of a solution with ph = 3.25. show all calculations leading to an answer

Which of the following has wavelength longer than the wavelength of viable light? a) x rays b) gamma rays c) radios waves d) ultraviolet waves