Vulcanization is the process whereby the polymer chains of natural rubber are cr
ID: 510878 • Letter: V
Question
Vulcanization is the process whereby the polymer chains of natural rubber are cross-linked by the addition of which element? a. carbon b. sulfur c. oxygen d. nitrogen In general, the best way to dispose of plastics is a. composting b incineration c. in landfills d. recycling An apple hanging on a branch above Isaac Newton's head has a. force energy b. kinetic energy c. potential energy d. rotational energy The largest portion of Earth's incident solar radiation a. power the water cycle b. is converted to heat c. power photosynthesis d. is reflected back to space When solid NaOH is dissolved in water, the water gets hotter, indicating that this dissolving is an a. endothermic process because it absorbs heat b. endothermic process because it releases heat c. exothermic process because it absorbs heat d. exothermic process because it releases heat In the process represented by the equation H_2O(l) rightarrow H_2O(g), the entropy a. decreases b. depends on the catalyst c increases d. remains the same The octane rating for gasoline is a measure of the fuel's a. concentration of octane (C_8H_18) b. energy content in kilocalories c. power rating d. tendency to cause knocking Fission, not fusion, is used in nuclear power plants because fusion a. uses expensive transuranium elements as fuel b. produces less heat than fission c. produces waste products that are radioactive for centuries d. requires temperatures of millions of degrees, making the reaction difficult to contain Which of the following is an n-type semiconductor? a. arsenic doped with silicon b. arsenic doped with germanium c. silicon doped with arsenic d. con doped with boron The fuel used by almost all current fuel cells is a. electricity b. hydrogen c. natural gas d. propane The energy that comes from the internal heat of the Earth is a. bioenergy b. geothermal energy c. hydroelectricity d. solar energyExplanation / Answer
13. Sulfur
14. Recycling
17. Exothermic reaction and Releases heat to the surroundings.
18. Increases , since entropy is the measure of randomness. In gaseous state, molecules are arranged in zig zag manner,so orderness is less and randomness is more than liquid state.
19. Power rating, ie., efficiency of fuel
20. Fusion require high temperature and releases less energy compared to fission.
21. Silicon doped with arsenic (v A group elements)- n type semi conductor
23. Geothermal energy
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