Calculate the amount of heat needed to melt 18.8 of solid hexane (C6H14) and bring it to a temperature of -55.5 degrees Celsius . Be sure your answer has a unit symbol and the correct number of significant digits.

Write the empirical chemical formula of calcium with a mass percent of 38.8, phosphorus with a mass percent of 20.0, and oxygen with a mass percent of 41.3.

When a septic tank backs up a goes in to clean it out

1) describe the physical layout of the ocean floor ? 2) explain how the dumbo octopus swims differently than other octopus species and why this would be an advantage in the aphonic zone . 3) why are the types of organisms that live at each underwater hot vent so dramatically different ?