Which of the following accurately describes properties of valence? a. the greater the number of electrons an atom has to borrow or to lend, the greater the activity of the atom. b. metals tend to have a negative valence and tend to be electron borrowers. c. the smaller the number of electrons an atom has to borrow or to lend, the greater the activity of the atom. d. nonmetallic elements tend to have a positive valence and tend to be electron borrowers.

On a day when the barometer reads 75.23 cm, a reaction vessel holds 250 ml of ideal gas at 20 celsius. an oil manometer ( ρ= 810 kg/m^3) reads the pressure in the vessel to be 41 cm of oil and below atmospheric pressure. what volume will the gas occupy under s.t.p.?

Anonzero net force acts on a particle and does work. which one of the following statements is true? the kinetic energy of the particle changes, but the speed of the particle does not change. the kinetic energy of the particle does not change, but the speed of the particle does change. the kinetic energy of the particle changes, but the velocity of the particle does not change. the kinetic energy and the speed of the particle change, but the velocity of the particle does not change. the kinetic energy, speed, and velocity of the particle change.

Which of these activities increases the amount of carbon in the atmosphere?