Calculate the number of pounds of released into the atmosphere when a tank of gasoline is burned in an automobile engine. assume that gasoline is primarily octane, and that the density of gasoline is this assumption ignores additives. also, assume complete combustion.

Which of the following is an example of physical change not a chemical change? a) a log gives off heat and light as it burns. b) a tree stores energy from the sun in its fruit. c) a penny lost in the grass slowly changes color. d) a water pipe freezes and cracks on a cold night.