8. A 50,000 g septic tank reading reports that methane gas bubbles are present with a concentration of 17 ppm. How many grams of methane gas are present in this sample?​

Use examples from the article to explain one positive and one negative effect that chemistry has had on society

Three cards with holes are arranged in a straight line. a light is shined through the first card’s hole and travels through all three cards. what does this tell you about light rays? a) that light is reflected b) that light is refractive c) that light travels in a straight line d) that light does not travel in a straight line

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.