He diagram below represents part of the oxygen cycle. Which arrow, or series of arrows, represent the movement of atmospheric oxygen (O2 ) during respiration?
a. only arrow 2 b. only arrows 2 and 6 c. only arrows 1 and 6 d. only arrow 6

Achemistry student weighs out of phosphoric acid , a triprotic acid, into a volumetric flask and dilutes to the mark with distilled water. he plans to titrate the acid with solution. calculate the volume of solution the student will need to add to reach the final equivalence point. round your answer to significant digits.

State the formula for density in words and mathematical symbols

If equal masses of the listed metals were collected , which would have a greatest volume ? a. aluminum 2.70,b.zinc7.14,c.copper 8.92,d.lead 11.34