What does the latent heat of fusion measure? O A. The energy required to melt a substance
O B. The energy required to boil a substance
O c. The energy required to form a substance
O D. The energy required to heat a substance

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.

The vapor pressure of ethanol is 1.00 × 102 mmhg at 34.90°c. what is its vapor pressure at 61.61°c? (δhvap for ethanol is 39.3 kj/mol.)

Which of two curves exhibits exponential growth