A system suffers an increase in internal energy of 102 J and at the same time the has in the system is compressed from 517 ml to 276 ml by a constant external pressure of 3.9 atm. what is the heat change of the system

What is the empirical formula of c6h18o3? ch3o c2h5o c2h6o c2h5o5

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.

What effect would average population growth have on land usage? a. urban use of land would rise to more than 30 percent of available land. b. industrial use of land would rise to more than 30 percent of available land. c. the percentage of available land used as cropland would stay the same. d. cropland would fall to about 10 percent of available land.