1. The ideal gas law (PV=nRT) provides relationships among pressure, volume, amo
ID: 782214 • Letter: 1
Question
1. The ideal gas law (PV=nRT) provides relationships among pressure, volume, amount, and temperature of a gas inside a container. If the Kelvin temperature in a container is doubled, which of the following changes may occur?
A. .One-half of the amount of gas is removed from the container.
B. The volume is doubled and the pressure is halved while no more gas is added to the container.
C. The volume is halved and the pressure is doubled while no more gas is added to the container.
D. The volume and the pressure are both doubled while no more gas is added to the container.
E. The volume and the pressure are both halved while no more gas is added to the container.
2. Stable isotopes have a ratio of neutrons to protons that form a compact band known as the band of stability. All of the following statements about the band of stability are true EXCEPT
A. For elements with atomic numbers of 20 or less, the neutron to proton ratio is close to 1 for isotopes within the band of stability.
B. For elements with atomic numbers greater than 20, the neutron to proton ratio increases until it reaches a ratio of 2 for isotopes within the band of stability.
C. The band of stability stops and then reappears as a little island at the top, corresponding to superheavy elements that have been predicted to be stable.
D. Isotopes are considered to be stable if they are nonradioactive isotopes or radioactive isotopes with measurable half-lives.
E. The neutron to proton ratio increases after element #20 because once a nucleus has 20 or more protons, it has become so positive that additional neutrons are required to help keep it together.
A. .One-half of the amount of gas is removed from the container.
B. The volume is doubled and the pressure is halved while no more gas is added to the container.
C. The volume is halved and the pressure is doubled while no more gas is added to the container.
D. The volume and the pressure are both doubled while no more gas is added to the container.
E. The volume and the pressure are both halved while no more gas is added to the container.
Explanation / Answer
1> A
2> E
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