Answer the following question given this paragraph: Surface Tension Cohesive forces between molecules cause the surface of a liquid to contract to the smallest possible surface area. This general effect is called surface tension. Molecules on the surface are pulled inward by cohesive forces, reducing the surface area. Molecules inside the liquid experience zero net force, since they have neighbors on all sides. Surface Tension Cohesive forces between molecules cause the surface of a liquid to contract to the smallest possible surface area. This general effect is called surface tension. Making Connections: Surface Tension Forces between atoms and molecules underlie the macroscopic effect called surface tension. These attractive forces pull the molecules closer together and tend to minimize the surface area. This is another example of a submicroscopic explanation for a macroscopic phenomenon. The model of a liquid surface acting like a stretched elastic sheet can effectively explain surface tension effects. For example, some insects can walk on water (as opposed to floating in it) as we would walk on a trampolinethey dent the surface as shown in Figure 11.28(a). Figure 11.28(b) shows another example, where a needle rests on a water surface. The iron needle cannot, and does not, float, because its density is greater than that of water. Rather, its weight is supported by forces in the stretched surface that try to make the surface smaller or flatter. If the needle were placed point down on the surface, its weight acting on a smaller area would break the surface, and it would sink. Q: Surface tension forces between moleculse cause the surface of liquid to contract to what? Choices: - typically surface area - Weak Surface area - strongest surface area - smallest surface area A:
smallest surface area
(Question)
Answer the following question given this paragraph: Q: What flows across the membrane resulting in changes in the membrane potential? Choices: - electrons - acids - neutrons - ions A:
(Answer)
ions
Ques: Answer the following question given this paragraph: The chloroplast is the site of photosynthesis. Part of the photosynthesis reactions occur in an internal membrane within the organelle. The chloroplast contains many of these internal membranes, making photosynthesis very efficient. These internal membranes stack on top of each other, just like a stack of pancakes. Q: What structure, containing many internal membranes, is the site of photosynthesis? Choices: - ribosome - mitochondria - genome - chloroplast A:
Ans: chloroplast
(Q).
Answer the following question given this paragraph: Crocodilia Reptiles in the Crocodilia Order are called crocodilians. They include crocodiles, alligators, caimans, and gharils. They have four sprawling legs that allow them to run surprisingly fast. They have strong jaws and replace their teeth throughout life. Crocodilians have relatively complex brains and greater intelligence than other reptiles. crocodile. Q: The crocodilia order, which includes crocodiles, alligators, caimans, and gharils, is part of what class of animals? Choices: - aquatic - mammals - parasites - reptiles A:
(A).
reptiles
Ques:Answer the following question given this paragraph: Q: The band disappears before metaphase but predicts the future plane of what? Choices: - cell matter - cell wall - cell solution - cell division A:

Ans:cell division
Answer the following question given this paragraph: Salts of weak acids or bases can affect the acidity or basicity of their aqueous solutions. Q: Salts of weak acids or bases can affect the acidity or what of their aqueous solution? Choices: - atomicity - compound - ductility - basicity A:
basicity