Due to its low-density styrofoam isn't economically feasible to recycle and is becoming a widespread pollutant. Styrofoam is polymerized from which starting molecule? A. Septane

B. Ethylene

C. Styrene

D. Acetylene

PLS HELP THANK YOU!!!

Given sno2 + 2h2 - sn + 2h20 tin oxide reacts with hydrogen to produce tin and water. how many moles of sno2 are needed to produce 500.0 grams of sn?

What are transitions between a liquid and gas called? identify which way they are transitioning

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.