Which of the two substance has a higher boiling point: butane (ch3ch2ch2ch3) or isobutane ((ch3)3ch). explain your choice using the theory of imf’s.

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.