The value of E for a system that performs 120 kJ of work on its surroundings and gains 50 kJ of heat is .

Identify the missing numbers below to show the result of multiplying the numbers (1.6 × 10-19)(5.0 × 106) = c × 10d

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.

Acompound has the molecular formula c3h8. which class of organic compounds does it belong to?