When calcium burns in oxygen, it forms calcium oxide. The balanced equation is 2Ca + 02 -- 2CaO What mass of calcium must be burned in order to produce 56 grams of calcium oxide?

A. describe the model of urban structure most often observed in mega-cities in developing countries. explain how this model differs from common urban structures in north america. b. describe at least two factors leading to the growth of mega-cities in developing or least-developed countries. c. identify and explain two factors that led to the formation of squatter settlements in mega-cities in developing countries.