and 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
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digits 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)
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mom SA- But she’s adopted S- *goes to the corner and cries* *Dart Scene* C- y’all ready for a family game night? SA- I suppose it will help release tension‚ Heather you’re up for it C- It will help you with your precision and accuracy because you suck so bad (Explains precision and accuracy) *heather throws all three darts and misses* SA- Well you’re accurate at sucking but at least you’re precise
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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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The results only give an indication about precision; they give no indication of accuracy. Accuracy is a measure of how close the results are to a known literature value; however‚ because a known molarity for the hydrochloric acid is not known‚ a measure of accuracy cannot be made. In contrast‚ a measure of precision can be made using the results. Precision refers to how close a set of results are to each other. In this lab‚ the percent relative average deviation can be used as an indicator of preciseness
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| |write sentences of various lengths and types‚ using a variety of sentence structures as an aid to meaning. | |use a wide range of vocabulary with precision. | |punctuate accurately and effectively. | |write in paragraphs
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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 the final
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lasts three years. This article uses the straight sell tactic. The article consists of a straightforward and clear presentation of the digital watch and its benefits. The advertisement clearly explains the features of the watch such as its precision and accuracy‚ differentiating it from other watches. The article actually states that‚ "if you travel-this watch is a necessity" (People‚ 2003). The advertisement also uses the educational tactic. The ad offers a detailed explanation of the digital
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When the operating button is pressed again ‚ the piston descends ‚ expelling the liquid from the tip. We need to optimize volume range by selecting the correct volume pipette . We must work in the 35% to 100% volume range for best accuracy and precision . Besides that ‚ the tip immersion angle also plays an important role . Nextly‚ the micrometer setting must be done using the correct technique . If filled ‚ we should not lay the pipette down or hold more than 20º from vertical . Lastly ‚ we should
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created a graph. Using the graph‚ get the best-fit straight line to examine the relationship. Using the predicative model (the best-fit line) to determine the percent copper and zinc in pennies. Then accuracy the errors and error percentages. Precision the absolute deviation and the deviation percentages. Observation: Part 1: Pre-82 Pennies Weight 10 dry pre-82 pennies which get 30.29g‚ using 30ml initial volume measuring the volume of 10 pennies‚ record the data 3.0ml. Using equation Density=
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