Answer the following question given this paragraph: Carbon dioxide is an example of a material that easily undergoes sublimation. Q: Carbon dioxide is an example of a material that easily undergoes what? Choices: - decomposition - spontaneous mutation - amplification - sublimation A:
sublimation
(Question)
Answer the following question given this paragraph: Chemical Reactions and Molecules All elements are most stable when their outermost shell is filled with electrons according to the octet rule. This is because it is energetically favorable for atoms to be in that configuration and it makes them stable. However, since not all elements have enough electrons to fill their outermost shells, atoms form chemical bonds with other atoms thereby obtaining the electrons they need to attain a stable electron configuration. When two or more atoms chemically bond with each other, the resultant chemical structure is a molecule. The familiar water molecule, H2O, consists of two hydrogen atoms and one oxygen atom; these bond together to form water, as illustrated in Figure 2.9. Atoms can form molecules by donating, accepting, or sharing electrons to fill their outer shells. Q: All elements are most stable when their outermost shell is filled with electrons according to which rule? Choices: - quartet rule - string rule - coupling rule - octet rule A:
(Answer)
octet rule
Ques: Answer the following question given this paragraph: During mitosis , when the nucleus divides, the two chromatids that make up each chromosome separate from each other and move to opposite poles of the cell. This is shown in Figure below . You can watch an animation of the process at the following link: http://www. biology. arizona. edu/Cell_bio/tutorials/cell_cycle/MitosisFlash. html . Q: When the nucleus divides, the two chromatids that make up each chromosome separate from each other and move to opposite poles of the cell during this process? Choices: - spawning - cytokinesis - meiosis - mitosis A:
Ans: mitosis
(Q).
Answer the following question given this paragraph: People protect areas that might flood with dams. In dire situations, they use sandbags ( Figure below ). Dams are usually very effective, but high water levels sometimes cause a dam to break. In that case, flooding can be catastrophic. Flood waters can also overflow a dam. People may line a river bank with levees to protect against floods. These are high walls that keep the stream within its banks during floods. Flood protection in one location sometimes causes problems elsewhere. For example, a levee in one location may just force the high water upstream or downstream. This will lead to flooding in a different location. Sometimes water gets so high that the river must be allowed to flood. Q: What do people build to protect areas from floods? Choices: - reinforced walls - drains - sewers - dams A:
(A).
dams
Ques:Answer the following question given this paragraph: pH Regulation Recall that enzymes lose their three-dimensional conformation and, therefore, their function if the pH is too acidic or basic. This loss of conformation may be a consequence of the breaking of hydrogen bonds. Move the pH away from the optimum for a specific enzyme and you may severely hamper its function throughout the body, including hormone binding, central nervous system signaling, or myocardial contraction. Proper kidney function is essential for pH homeostasis. Q: Proper kidney function is essential for homeostasis of what level, which in turn helps ensure the functioning of enzymes? Choices: - oxygen - calcium - ions - ph A:

Ans:ph
Answer the following question given this paragraph: A: The energy is stored in the bonds of the products as chemical energy. In an endothermic reaction, the products have more stored chemical energy than the reactants. This is represented by the graph on the left in the Figure below . In an exothermic reaction, the opposite is true. The products have less stored chemical energy than the reactants. You can see this in the graph on the right in the Figure below . Q: Endothermic and exothermic reactions differ in whether the products or reactants store more of what? Choices: - Motion energy - Thermal energy - Kinetic Energy - chemical energy A:
chemical energy