Answer the following question given this paragraph: The penumbra is the part of the shadow that is partially lit. Q: What is the part of the shadow that is partially lit called? Choices: - eclipse - pleura - pentila - penumbra A:
penumbra
(Question)
Answer the following question given this paragraph: Each separate substance in a medium, such as the extracellular fluid, has its own concentration gradient, independent of the concentration gradients of other materials. Additionally, each substance will diffuse according to that gradient. Several factors affect the rate of diffusion. Extent of the concentration gradient: The greater the difference in concentration, the more rapid the diffusion. The closer the distribution of the material gets to equilibrium, the slower the rate of diffusion becomes. Mass of the molecules diffusing: More massive molecules move more slowly, because it is more difficult for them to move between the molecules of the substance they are moving through; therefore, they diffuse more slowly. Temperature: Higher temperatures increase the energy and therefore the movement of the molecules, increasing the rate of diffusion. Solvent density: As the density of the solvent increases, the rate of diffusion decreases. The molecules slow down because they have a more difficult time getting through the denser medium. Q: In a medium, the closer the distribution of the material gets to what state, the slower the rate of diffusion becomes? Choices: - erosion - gas - elastic - equilibrium A:
(Answer)
equilibrium
Ques: Answer the following question given this paragraph: Only when a lower energy level is full are electrons added to the next higher energy level. Electrons at higher energy levels, which are farther from the nucleus, have more energy. They also have more orbitals and greater possible numbers of electrons. Q: When a lower energy level is ______ electrons are added to the next higher energy level. Choices: - unbalanced - ready - empty - full A:
Ans: full
(Q).
Answer the following question given this paragraph: Gas bubbles get bigger when they are under less pressure. Q: If everything in a system stays the same but the pressure deceases, gas bubbles will change in what way? Choices: - they multiply - they pop - they get smaller - they get bigger A:
(A).
they get bigger
Ques:Answer the following question given this paragraph: Under what conditions then, do gases behave least ideally? When a gas is put under high pressure, its molecules are forced closer together as the empty space between the particles is diminished. A decrease in the empty space means that the assumption that the volume of the particles themselves is negligible is less valid. When a gas is cooled, the decrease in kinetic energy of the particles causes them to slow down. If the particles are moving at slower speeds, the attractive forces between them are more prominent. Another way to view it is that continued cooling the gas will eventually turn it into a liquid and a liquid is certainly not an ideal gas anymore (see liquid nitrogen in the Figure below ). In summary, a real gas deviates most from an ideal gas at low temperatures and high pressures. Gases are most ideal at high temperature and low pressure. Q: Gases are most ideal at high temperature and what pressure? Choices: - absolute - high - stable - low A:

Ans:low
Answer the following question given this paragraph: The water Americans get from their faucets is safe. This water has been treated and purified. At least 20% of the world's people do not have clean drinking water always available. That's more than 1 billion people. They must drink water from where they can get it. Maybe straight from a river or pond ( Figure below ). Human wastes may be in the water. If that's the case, the water will probably contain pathogens. Pathogens are organisms that cause diseases. Q: At least 20 percent of the world's people do not have a ready supply of what? Choices: - clothing - food - oil - clean drinking water A:
clean drinking water