How do I balance this equation? Cr2O3(s)+C(s)→Cr(s)+CO(g)

What is the mass defect of a mole of nuclei with 1.8 x 10^15 j/mol binding energy?

Ageologist determines that a sample of a mineral can't be scratched by a steel nail but can be scratched by a masonry drill bit. based on this information, the sample mineral has to be softer than a. orthoclase. b. fluorite. c. apatite. d. corundum.

What happens to the average kinetic energy of a gas when the particles of the gas collide against each other at a constant temperature and volume? explain your answer.