(Question)
Answer the following question given this paragraph: The Van de Graaff Generator Van de Graaff generators (or Van de Graaffs) are not only spectacular devices used to demonstrate high voltage due to static electricitythey are also used for serious research. The first was built by Robert Van de Graaff in 1931 (based on original suggestions by Lord Kelvin) for use in nuclear physics research. Figure 18.38 shows a schematic of a large research version. Van de Graaffs utilize both smooth and pointed surfaces, and conductors and insulators to generate large static charges and, hence, large voltages. A very large excess charge can be deposited on the sphere, because it moves quickly to the outer surface. Practical limits arise because the large electric fields polarize and eventually ionize surrounding materials, creating free charges that neutralize excess charge or allow it to escape. Nevertheless, voltages of 15 million volts are well within practical limits. Q: Practical limits of van de graaff generators arise because the large electric fields polarize and eventually do what to surrounding materials? Choices: - displace - isolate - decompose - ionize A:
(Answer)
ionize

(Question)
Answer the following question given this paragraph: thrombosis, can be caused by excessive numbers of platelets. A thrombus is a collection of fibrin, platelets, and erythrocytes that has accumulated along the lining of a blood vessel, whereas an embolus is a thrombus that has broken free from the vessel wall and is circulating in the bloodstream. Q: What is a collection of fibrin, platelets, and erythrocytes that has accumulated along the lining of a blood vessel called? Choices: - atherosclerosis - embolus - clots - thrombus A:
(Answer)
thrombus

(Question)
Answer the following question given this paragraph: Reactant concentrations are highest at the beginning of a reaction. The plot of [C] versus tis a curve with a slope that becomes steadily less positive. Q: Reactant concentrations are highest at which part of a reaction? Choices: - ending - middle - concurrent - beginning A:
(Answer)
beginning