A chemist wants to make 450. mL of a solution that is 0.500 M in concentration of Zn2+. Her available materials are 1.45 M ZnSO4 and 0.200 M ZnCl2. Unfortunately for the chemist, there is no deionized water available to dilute the solutions. Assuming that the solutions’ volumes are additive, how many mL of each solution are required to make the 450. mL of 0.500 M Zn2+solution? Which of the ions present has the lowest concentration in the final solution Volume of 1.45 M ZnSO4
Volume of 0.200 M ZnCl2
Ion with lowest concentration in final solution

The earth's moon is unusually large. two popular theories of the moon's origin include the "sister world" hypothesis, which states that the moon formed from the same materials as the earth, near enough to the earth that they fell into orbit around each other. a second theory is the "capture" hypothesis, in which the moon formed elsewhere in the solar system, and the earth's gravity pulled it into its orbit. studies of what the moon is made of indicate that some of its materials had to come from the earth or from the same area of the solar system where the earth had formed. at the same time, the moon does not contain much of the material that makes up the earth's core, so the moon could not have formed from the same materials as the earth. how do the two facts above affect the described theories of the moon's origin? a. they show that scientists will never agree on where the moon came from. b. they show that more experiments on moon formation need to be done. c. they show that no theory accounts for the existence of the moon. d. they show that neither theory is complete and entirely correct.

What is the independent variable in this investigation? mass volume sample number substance density

What does a complete balanced chemical equation include? a. exothermic coefficients b. endothermic coefficients c. valence electrons d. molar coefficients