A mixture of 80.0 g of Cr2O3 and 8.00 g of C is used to produce elemental Cr by the reaction
Cr2O3 + 3C
2 Cr + 3 CO
a) What is the theoretical yield of Cr that can be obtained from the reaction mixture?
Cr2O3 (aq) + 3 C (s) - 2 Cr (s) + 3 CO (g)
b)which reactant is excess and how many grams are left over ?

Which of the following might a chemist choose to study? a. glacier movement in alaska b. better ways to recycle plastics c. the effects of hurricanes on turtle populations d. the vibrations in bridges caused by big trucks

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.

If a solution is considered basic, then a) the hydroxide ion and hydronium ion concentrations are equal. b) the hydroxide ion concentration is less than the hydronium ion concentration. c) the hydronium ion concentration is greater than the hydroxide ion concentration. d) the hydroxide ion concentration is greater than the hydronium ion concentration.