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Tham khảo tài liệu 'read know english 7', ngoại ngữ, anh ngữ phổ thông phục vụ nhu cầu học tập, nghiên cứu và làm việc hiệu quả | ACT SCIENCE REASONING TEST PRACTICE performed on scatter plots. Here is an example. The scatter plot shows the concentration of a reactant consumed in a chemical reaction as a function of time. Concentration of a Reactant Notice that data were not taken at the beginning of the experiment zero seconds and beyond 500 seconds. If you assume that the thick line will maintain its shape in both directions you can solve this problem. At the beginning of the experiment the concentration of the reactant was at a maximum. Therefore it had to be higher than 0.15 mol liter. If you extend the thick data line to the y-axis the gridline corresponding to zero seconds while maintaining the shape of the curve you can estimate the initial concentration of the reactant was about 0.18 mol liter. How about the concentration at 600 seconds At 300 seconds the concentration of the reactant seems to have leveled of at 0.05 mol liter. It stays the same at 400 seconds at 450 seconds and 500 seconds. Wouldn t you bet that the concentration will remain 0.05 mol l at 600 seconds Drawing Conclusions To draw a conclusion we take all available facts into account and make a decision or statement based on all these facts put together. Question Did he do it Facts The accused had a motive no alibi and the unfortunate luck of being seen by the nosy neighbor. Conclusion The accused is guilty. In the case of science in very much the same way we need to pull all the information available together sum it up and make a judgment or prediction. Example 1 Question If you were looking for a metal whose heat transfer properties didn t vary much over a wide range of temperature which metal from the list in the preceding example would you use 269 --------------------- ACT SCIENCE REASONING TEST PRACTICE ---------------------------------- Facts Thermal conductivity of platinum hardly changes with temperature. The variation of other metals with temperature is greater. Conclusion Platinum. Example 2 Facts The average
