How many moles of C2H6 are needed to completely react with 4.30 moles of O2 according to the above equation? You must show all your work to receive credit.

Draw the skeletal structures of two different molecules that are each made of 5 carbon atoms and 12 hydrogen atoms.

Which of these would be caused by a chemical change? a) the formation of lava. b) sedimantary rock layering over time. c) metamorphic rock forming from igneous. d) metamorphic rock eroding to form sedimentary rock.

Which of the following describes a situation where competition between producers exists