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    For example, S=√(〖∑▒〖(x-x ̅ ̅ 〗)〗^2/(n-1) □(⇒┬ )) √((〖∑▒〖((7.50-7.20〗)〗^2+〖(6.77-7.20)〗^2+〖(7.17-7.20)〗^2+〖(7.84-7.20)〗^2+〖(6.73-7.20)〗^2)/(5-1) ) S=√(0.906/4)=0.48 g/〖cm〗^3=0.48 mL Water added by 50 mL beaker Water added by 10 mL grad cylinder Water added by 50 mL buret Average volume (mL) 7.20 mL 9.88 mL 9.96 mL Standard deviation (mL) 0.48 mL 0.044 mL 0.060 Absolute error for glassware (mL) 2.8 mL 0.12 mL 0.04 mL Relative error for glassware (%) 28.0% 1.2% 0.4% Relative standard deviation for glassware (%) 6.7% 4.5% 0.60% The absolute error shows the accuracy of the experimental error compared to the true value. Compare the amount of each aliquot to the average volume of each. An example of how to calculate this is shown below. error=X_true-X_experimental □(⇒┬ 10 mL-7.20 mL=2.8 mL) To find the relative error, the following formula is used: % error=(|X_true-X_experimental |)/X_true x 100% (|10-7.20|)/10 x 100%=28.0% To find the relative standard deviation, use the following…

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    Powdered Grape Lab

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    The graduated cylinder was used to pour the 90 mL of tap water into the 150 mL beaker with G2 powder. The mixture was stirred with a stirring rod until it had completely dissolved. 7. A paper towel a stirring rod was then used to clean and dry the graduate cylinder of any remaining water. 8. The G2 mixture was poured into the graduate cylinder and was weighed. An analytical balance was used for this process. The mass of the graduated cylinder (Step 4) was subtracted from the graduated cylinder…

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    Blended Mixture

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    After putting each compound into the blended meal, then it was determined whether it contains organic or inorganic in it. The bacon ranch salad reacted negatively to the solutions. While also being tested on a well-plate and hot-plate, it still remained the same color. Therefore, the blended mixture does not contain any organic substances such as protein. We began our experiment by gathering our materials and began to test the change in the blended mixture by putting a small amount in well…

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    To begin the first part of the experiment, zeolite and magnetized zeolite had to be synthesized. First, it was necessary to set up a contraption to hold a thermometer in place. This was done using a split cork and a 3 prong clam on a ring stand. 50 mL of 3.0 M NaOH was then added to a 250 mL beaker with a magnetic stir bar placed inside. After placing the solution on the stir bar, 3.7560 g of (sodium aluminate) was added to the solution. The thermometer was also added to the solution, but it…

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    Chem 115 Lab Report

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    Lab 4 in Chem 115 has three parts all calculating density. In part one, a 100 mL beaker, a volumetric pipet, and an analytical scale were obtained. To begin, the mass of the beaker was taken using an analytical scale. Then, 10.0 mL of an unknown liquid was transfered to the beaker using the volumetric pipet. Next, the mass of the beaker and liqiud was recorded along with the letter identifying the unknown liquid. By subtracting the mass of the 100 mL beaker from the mass of the beaker and…

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    Volumetric Pipette Lab

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    Aim The aim of this practical is to measure the effect of volume, density and temperature. It is also help to be familiar with variety of common laboratory technique. Materials Weighting scale Container with lids 20 and 10 ml Volumetric pipette Beaker Thermometer Test Tubes Volumetric flask Natural Rubber Pipette Filler Micropipette tips Tips boxes Method There are two pipette, choose one which you using in whole practical. Label and weight accurately, to 4 decimal places. Collect…

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    Leaf Disk Lab Report

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    Introduction: Leaf Disk float in water alone. When a solution consisting of a small amount of sodium bicarbonate is added to the water it causes the leaf disk to sink. As photosynthesis continues in the leaf disk it releases oxygen and causes the leaf disk to rise. While cellular respiration is occurring also the rate that the disk raise is an in implicit measurement of the net rate of photosynthesis. The independent variable in this lab is the solution and the light because it can be…

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    Ekg Lab

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    Introduction The purpose of this lab was to determine the rate, function, and integrity of the heart during an exercise EKG. An electrocardiogram measures the electrical activity of the heart over time. In this lab a subject will exercise for about 15 minutes, not including rest times and the EKG will measure the heart’s activity. Methods Collect the following demographics for the subject: age, gender, height, MI, skinfold measurements, and weight. Locate the 10 electrode sites and shave the…

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    Calorimetry Volume Lab

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    In the volume lab, we found that the large graduated cylinder was the most accurate because it had less percent error when measuring the density of water over all of the other measuring tools.In this lab, we measured water from pipettes including volumetric and graduated pipettes, graduated cylinders, erlenmeyer flasks, and beakers to figure out the mass and density. These measurements were then used to calculate the percent error. We completed these measurements by measuring the volume of the…

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    Heptahydrate Lab Report

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    Materials and Procedure The materials that were used were the following: 4.268 grams of zinc sulfate heptahydrate, 2.586 grams of calcium acetate monohydrate, Analytical balance, 220 milliliters of deionized water, stir stick, two 100 milliliter glass beakers, one 250 milliliter glass beaker, filter paper, ring stand, glass funnel, and an Erlenmeyer flask. All of the materials listed above were obtained or taken into consideration before experimentation began. A piece of weight paper was…

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