There is 5 mL of dissolved oxygen in a lake that is 625 L in total. What is the concentration of dissolved oxygen, in ppm? Don't forget units! (Note: 1L = 1000
mL)

Much of the general structure and physical properties of the interior of the earth are inferred from: a)deep oil and gas bore holes b)geologic investigations c)analysis of seismic waves d) study of volcanoes

Melissa is interested in her family tree and how her family has changed over its many generations. melissa probably more closely resembles

Dumbledore decides to gives a surprise demonstration. he starts with a hydrate of na2co3 which has a mass of 4.31 g before heating. after he heats it he finds the mass of the anhydrous compound is found to be 3.22 g. he asks everyone in class to determine the integer x in the hydrate: na2co3·xh2o; you should do this also. round your answer to the nearest integ