Calculate the change in internal energy (ΔE) for a system that is giving off 35.0 kJ of heat and is changing from 21.00 L to 15.00 L in volume at 1.50 atm pressure. (Remember that 101.3 J = 1 L∙atm)

In a sample of oxygen gas at room temperature, the average kinetic energy of all the balls stays constant. which postulate of kinetic molecular theory best explains how this is possible? a. attractive forces between gas particles are negligible because the particles of an ideal gas are moving so quickly. b. collisions between gas particles are elastic; there is no net gain or loss of kinetic energy. c. gases consist of a large number of small particles, with a lot of space between the particles. d. gas particles are in constant, random motion, and higher kinetic energy means faster movement.

Electric charge is what ? a. kinetic energy b. radiation c. discovery d. electricity

An atom of sodium-23 (atomic number = 11) has a positive charge of +1. give this information, how many electrons does it have? how many proteins and neutrons does this atom have