Please help with questions 2 & 3 Chem 105 Online1-Measurement of Physical PropertiesPart One: Using Chemical EquipmentOBJECTIVES:To become acquainted with the various forms of chemical equipment.To determine which equipment provides the best accuracy and precision.INTRODUCTIONChemistry frequently requires the measurement of physical properties of compounds. Two of themost common measurements are mass and volume. During this experiment, we will use the toploading balance to determine mass to 0.01g sensitivity. Since these masses are experimentalvalues, it is important to always record the balance reading to the full limit of its sensitivity.When taking measurements, it is important to distinguish between accuracy and precision. Theprecision of a numerical result is related to reproducibility, while accuracy is an expression of theuncertainty in the number (the amount of deviation from the "correct" or "real" number).Commonly, precision is related to random error (common unavoidable errors), while accuracy isdependent on both random and systemic errors (habitual error).1. Determination of Percent Error of Various Volumetric EquipmentIn the first part of the experiment, a distinct volume of water will be measured with a 10mLgraduated cylinder, a 100mL graduated cylinders, a 60mL buret and a plastic pipet. Eachquantity of water will be weighed on the balance to measure the reproducibility and accuracyof the volume measurement. The density of water is temperature dependent and for examplethe mass of 10mL of water at room temperature will be about 9.94 to 9.98g. Thus water will havea mass very close to 9.96g for 10mL additions of water. For 25mL of water, it will have a mass of24.85g to 24.95g. Therefore, we will use 24.90g as the accepted mass of 25mL additions of waterTo determine the deviation of a measurement from this value can be expressed as the percenterror shown below.Accepted-Experimentall`Accepted% Error =(be sure to simply take the absolute value)Often I will describe this as "The difference between the two, all divided by the true" since thesign is an absolute value and we are looking for the overall deviation (either positive ornegative) compared to the actual or accepted value. If the percent error is small, themeasurements are accurate. If the percent error is constant for multiple data observations, themeasurements have good precision.The 100mL graduated cylinder has low precision and low accuracy due to large random errorsin the measurements. The scale on the cylinder is not designed to give high reproducibility, but israther intended for quick, rough measurements. The 10mL graduated cylinder has betterprecision and accuracy than the 100mL g.c. but is still not intended for highly quantitativelaboratory work. In contrast, the buret and pipet are designed to give good reproducibility (lowrandom errors and high precision) and they will be accurate as long as their calibration iscorrect (no systemic errors).* 100% KIT10mL graduated cylinderAt Home Buret150mL beaker100mL graduated cylinderPlastic beral pipetBalanceDistilled waterPRELABORATORY EXERCISE:1. Compare and contrast accuracy and precision.Accuracy is the measured valve Subtract the true value. Precisionis how close repeated measurements Come to their average.The accurate vales have to be precise but the precise valesmay or may not be accurate.2. A student performs the experiment and acquires a mass of 9.25g for a 10mL addition ofwater. What is their percent error for this trial?9.96-9.25gx100= 7.7 % error9.25g3. A student performs the experiment and acquires a mass of 25.28g for a 10mL addition ofwater. What is their percent error for this trial?9.969-25.28925.289*100=-61 %errorDocumentation: In addition to your data sheet belowbeing filled and post lab questions, all labs need tohave a separate file of a single pdf (not individualuploads of pictures) as supporting evidence of yourmeasurements. There are a couple of reasons you are being askedto do this:RObe1. As a lab science class, you are expected to demonstratemastery of equipment use.2. I need to see that it is you doing to the lab.3. I also need to provide feedback on your measurementscompared to the actual reading. This is where significantfigures come in.a. Be sure to use read feedback on submissions ANDlab documentation to improve course performance.***Lack of documentation will result in half earned credit the firsttime, the second offense will result in no points for that labsubmission. ***50-2.3.4!!! IMPORTANT5

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Answered: Please help with questions 2 & 3

Science

Chemistry

Please help with questions 2 & 3

Chemistry for Engineering Students

4th Edition

ISBN:9781337398909

Author:Lawrence S. Brown, Tom Holme

Publisher:Lawrence S. Brown, Tom Holme

Chapter4: Stoichiometry

Section: Chapter Questions

Problem 4.98PAE

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