Answer to Question 1
Yellow and blue. Yellow, called luminous combustion, is from incomplete combustion, gives off lots of light and some heat. Blue, called non-luminous combustion, is from complete combustion and gives off lots of heat and a little light.
Answer to Question 2
56 / 16 = 3.5 pounds 0.5 pounds x 16 ounces = 8 ounces 3 pounds 8 ounces