A cylinder with a valve at the bottom is filled with an ideal gas. the valve is now opened and some of the gas escapes slowly. the valve is then closed, after which the piston is observed to be at a lower position Assume that the system is in thermal equilibrium with the surroundings at all times.

a. Is the final pressure of the gas in the cylinder greater than, less than, or equal to the initial pressure? Explain.
b. In this process, which of the quantities P, V, n, and T are held constant and which are allowed to change?
c. Consider the following incorrect student statement.
"In the ideal gas law, P=nRT/V, so the pressure is inversely proportional to the volume. If you decrease the volume, the pressure has to go up."

What is the flaw in the student's reasoning?

d. Explain why it is not possible to use the ideal gas law to determine whether the pressure changed in this process.

Nova: secrets of the sun - video guide worksheet due tomorrowfront side (photo up top)back side (below of the following)1) a mass ejection is a wave of billions of tons of electrically charged particles.2) the sun is so huge, a earths could fit inside of it.3) the surface of the sun seems to vibrate because the sun generates waves4) using geoseismology or helioseismology, we can see the physical process under the sun's surface.5) the thickest layer of plasma in the sun is a region called the zone.6) the thinner plasma in the convection zone makes the move in a more ordered way.7) rising and sinking plasma created a mesmerizing structure called 8) the sdo revealed tornadoes or volcanoes, hundreds of miles high, on the surface of the sun9) sdo allows scientists to see sunlight across a range of 10) the earth's field protects us against threats from the sun.11) the plasma layers beneath the surface act as a which gets denser towards the core. 12) can light up along the paths of the magnetic field, making them visible. 13) the sun's the corona, is made of plasma that reaches over 3 million degrees.14) a sun spot is dark because it is cooler or warmer than its surroundings15) magnetic outbursts are more common during the period called solar