CH 101 Lecture Notes - Lecture 2: Conversion Of Units, Kinetic Energy, Exothermic Process

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pucearmadillo476

9 Dec 2016

School

University of Alabama

Department

Chemistry

Course

CH 101

Professor

Diana Leung

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Document Summary

Section 2. 2: the reliability of a measurement depends on the instrument used to make the measurement, scientific measurements are reported so that every digit is certain except the last, which is estimated, accuracy. Refers to how close the measured value is to the actual value: precision. Refers to how close a series of measurements are to one another or how reproducible they are: random error. Error that has equal probability of being too high or too low: systematic error. Error that tends toward either being too high or too low. Ratio of mass (m) to volume (v) Independent of the amount of the substance (i. e. density: extensive property. Dependent on the amount of the substance (i. e. mass) Action of a force through a distance: kinetic energy (ke) Energy associated with motion: potential energy (pe) Energy associated with position: total energy = potential energy (pe) + kinetic energy (ke, thermal energy (te)

Related Questions

Experimental outcomes in chemistry depend on making sound observations, taking precise measurements and accurately recording them directly in to the laboratory notebook. All experiments and therefore the results will contain errors (experimental error), which can adversely affect the reliability of the experiment and the credibility of the scientist. Experimental error is reduced when students master experimental techniques and become aware of which measurements have the most impact on the experiment in terms of accuracy and precision. Accuracy is determined by comparing the true or actual value to an individual experimental value or the average of many experimental values. If the true value is not given, the average of all the experimental values is assumed to be true value and accuracy is determined by comparing the average to the individual experimental values. Precision is a determined by comparing how close all the experimental values are to each other. The following data was collected by students in your laboratory section. Decide which value to you will use to complete the experimental calculations. The amount of error in your final experimental result depends on your decision. Each student used a different balance and weighed the beaker 4 times. The balances they used in the laboratory read to a hundredth of a gram. The results are shown below were recorded by each individual. What additional information about the students, instruments, and the conditions which the data was collected do you need to better of the evaluate the reliability of the experimental data? Give 1 and briefly (60 words or less, using complete sentences) explain your answer. Which set of data is the most precise? Show all equations and calculations. Briefly (60 words or less, using complete sentences) explain your answer. What student measurements are the least accurate? Briefly (60 words or less, using complete sentences) suggest how this student could improve their experimental techniques. Show all equation and calculations

Can someone please help me answers these questions with those two graphs ?

CH 101 Lecture Notes - Lecture 2: Conversion Of Units, Kinetic Energy, Exothermic Process

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