- What amount of heat will change 30 g of liquid water at 50°C to 250°C?
a. 8280 J
b. 67800 J
c. 6270 J
d. 82350 J

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.