What happens to the temperature of a substance while its changing state?

If an element has 3 electrons how many of them will be in the second energy level?

How long does it take a person at rest to breathe one mole of air if the person breathes 77.0 ml/s of air that is measured at 25 ∘c and 755 mmhg? express your answer numerically in seconds?

What is the energy of a photon whose frequency is 5.2 x 10 to the 15th s - 1? Cassie (:

If you fill a car's gas tank, and then drive a couple of hundred miles or so, the car's gas gauge will tell you the tank is nearly empty. You know that energy cannot be created, destroyed or "used up.

When using a film camera, what must you do to bring an object into focus? a. move the lens toward or away from the film. b. close the diaphragm. c. adjust the speed of the shutter. d. adjust the angle of the mirror.

A light beam in air strikes the surface of water at an angle of 26° with the normal. When it enters the water it bends toward the normal, making an angle of 19° with it. The velocity of light in air is approximately 300,000 km/s.

Which best explains the relationship between the speed of sound and the medium through which it passes?

g The magnetic force on a charged particle A. depends on the sign of the charge on the particle. B. depends on the velocity of the particle. C. depends on the magnetic field at the particle's instantaneous position. D.

How fast must a 1000 kg car be moving to have a kinetic energy of 1.0 kWh

Which of the following is used to measure weight? Newtons Liters Kilograms Meters