than those we actually measured. We need to round our answer off to reflect the same level of certainty in our answer as we had with the measures we made. Accurate or Precise? Precision refers to how close data are to each other Are the consistent with each other? Significant Figures indicate confidence/precision Accuracy refers to how close data are to an accepted value Error-difference between data point and accepted value % error-as part of accepted value International System of Units (SI) Base
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household chemicals together. Accuracy is the magnitude in which a certain measurement agrees with the standard worth for that measurement (Dictionary‚ 2011). Precision is how close the measured standards are to each other (Math is fun‚ 2011). Society depends on accuracy and precision in everyday life. These two relationships are often substituted freely‚ but both have crucial differences. Businesses entail both accurate and precise measurements to stay in business. Accuracy states that something is
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ability to ’tare’ when taking the mass of your sample? Be specific. Answer: Tare is used to reset a balance to zero in order to get only the weight of a sample‚ not of a sample and container (Yee‚ n.d.‚ Weighing…). It is important because accuracy and precision are both very important when measuring. The tare feature makes the measurement more accurate. It also allows just the substance to be measured without the substance having to be put directly on the balance. (c) (2 pts) What is the difference
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in presence of a base to yield phenylthiourea derivative. This derivative showed maximum absorbance at 240 nm. Beer’s law is obeyed in the concentration range of 5-25 µg/ml. The method was validated in terms of linearity‚ precision (relative standard deviation 1.1%)‚ accuracy and specificity. The proposed method is the only method available for spectrophotometric determination of the drug. It is simple‚ precise‚ accurate‚ sensitive and reproducible and can be used for the routine quality control
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the US should continue their use of drones in warfare. The use of drones in warfare should continue to be used by the US because they have multiple advantages. One of the reasons why drones are a huge benefit for the US is because of their precision and accuracy. An article that is in favor of the US continuing their use of drones in warfare states‚ “... since the United States began conducting drone strikes abroad following the Sep. 11‚ 2001 attacks‚
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Spectrophotometer Introduction In scientific experiments‚ correct measurements are required to achieve precise and accurate data. Precision is the degree to which several measurements provide answers very close to each other. Accuracy describes the nearness of a measurement to the standard or true value. Certain measuring devices are used to attain precision and accuracy. One example is the Air displacement pipette or the micropipettes. The micropipettes are measuring tools used to transfer liquid
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6429 Ω (from the graph) ΔS = |S1 - S2| / 2 = | (-0.4714 - (-0.6429)) | / 2 = 0.08580 Ω (cor. to 4 sig. fig) _THE INTERNAL RESISTANCE OF THE BATTERY ± Δ INTERNAL RESISTANCE OF THE BATTERY = 0.5223 Ω ± 0.08580 Ω_ (COR. TO 4 SIG. FIG) Percentage precision = (1.000 - 0.08580 /0.5223) x 100% = 83.57% (cor. to 4 sig. fig) _THE EMF OF THE BATTERY_ Uncertainty for intercept vertical axis From the graph above (Voltage against Current) Intercept vertical axis of the best-fit line = 1.2969 V (from the
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Experiment 2 CALIBRATION OF A PIPETTE Introduction An ordinary laboratory pipette may be expected to deliver its nominal volume with good precision and good accuracy if it is used in the way recommended. In this experiment we investigate the precision and accuracy of such a pipette by making accurate determinations of the mass of water it delivers in repeated operations. Materials 10.0-cm3 pipette‚ 50-cm3 beaker‚ thermometer‚ pipette filler‚ graph paper. Procedure
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final volume of the water in data table. To find the volume of the pennies‚ subtract the final volume from the initial‚ record the data. Repeat this procedure twice more. Use the density formula to calculate the density‚ and then calculate the accuracy and precision of your measurements. Mass 20 pennies‚ record data. Fill a 100mL graduated cylinder to 40mL or enough to fully submerge the pennies with water record the volume in data table. Carefully place the pennies into the graduated cylinder‚ record
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01.07 Accuracy and Precision: Balance Lab Worksheet Measurement * Measurement is an important skill used for data collection and data analysis. Careful attention to the accuracy and degree of uncertainty of each measuring device is necessary for proper data collection. Significant figures are used to record or report measurements accurately. * This laboratory activity will give you the opportunity to get more familiar with some of the basic measuring devices that are common in chemistry
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