Answer the following question given this paragraph: With fossil fuels becoming more expensive and less available, scientists are looking for other energy sources. Hydrogen has long been considered an ideal source, since it does not pollute when it burns. The problem has been finding ways to generate hydrogen economically. One new approach that is being studied is photoelectrolysis the generation of electricity using photovoltaic cells to split water molecules. This technique is still in the research stage, but appears to be a very promising source of power in the future. Q: What is the generation of electricity using photovoltaic cells to split water molecules called? Choices: - hybrid electricity - aqua-electricity - photovoltaic cells - photoelectrolysis A:
photoelectrolysis
(Question)
Answer the following question given this paragraph: Phase and Surface Area Effects When two reactants are in the same fluid phase, their particles collide more frequently than when one or both reactants are solids (or when they are in different fluids that do not mix). If the reactants are uniformly dispersed in a single homogeneous solution, then the number of collisions per unit time depends on concentration and temperature, as we have just seen. If the reaction is heterogeneous, however, the reactants are in two different phases, and collisions between the reactants can occur only at interfaces between phases. The number of collisions between reactants per unit time is substantially reduced relative to the homogeneous case, and, hence, so is the reaction rate. The reaction rate of a heterogeneous reaction depends on the surface area of the more condensed phase. Automobile engines use surface area effects to increase reaction rates. Gasoline is injected into each cylinder, where it combusts on ignition by a spark from the spark plug. The gasoline is injected in the form of microscopic droplets because in that form it has a much larger surface area and can burn much more rapidly than if it were fed into the cylinder as a stream. Similarly, a pile of finely divided flour burns slowly (or not at all), but spraying finely divided flour into a flame produces a vigorous reaction (Figure 14.3 "The Effect of Surface Area on Reaction Rates"). Similar phenomena are partially responsible for dust explosions that occasionally destroy grain elevators or coal mines. Q: Do particles collide more in two reactants when they are both in fluid forms or solid forms? Choices: - plasma - neither - solid - fluid A:
(Answer)
fluid
Ques: Answer the following question given this paragraph: Chemical energy and nuclear energy are other forms of potential energy. Q: Chemical energy is another form of which energy? Choices: - heat energy - nuclear energy - mechanical energy - potential energy A:
Ans: potential energy
(Q).
Answer the following question given this paragraph: Q: What orifice in the body is particularly helpful in both digestion and respiration? Choices: - nostril - nose - anus - mouth A:
(A).
mouth
Ques:Answer the following question given this paragraph: The major atmospheric gases are nitrogen and oxygen. The atmosphere also contains minor amounts of other gases, including carbon dioxide. Q: What are the two major atmospheric gases? Choices: - carbon and helium - nitrogen and hydrogen - hydrogen and oxygen - nitrogen and oxygen A:

Ans:nitrogen and oxygen
Answer the following question given this paragraph: The mass number is defined as the total number of protons and neutrons in an atom. Q: The total number of protons and neutorns in an atom is called what? Choices: - atom number - volume number - formation number - mass number A:
mass number