Which of the following is a mixture?

alcohol

water

mercury

ink

What is the percentage by mass of silicon (si) in iron aluminum silicate (fe3al2(sio4)3)?

Several kinds of bears are found on earth. most bears are brown or black, but one type of bear, the polar bear, is white. what process led to this difference in fur color? explain your answer.

The volume of helium in a blimp is 6.28 x 10^9 millimeters. the density of helium in the blimp is .1786 kilogram/meter^3. find the mass of the helium in the blimp.