Assume a standard tank of propane hold 9100 grams of C3 H8 how much carbon dioxide will be released if all propane fuel was burned?

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.