Invesitgation 4 - Investigation 4 How is lab equipment used...

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Investigation 4: How is lab equipment used? CHM 113 Lab ML8 TA: Rebecca Hamel Group # 1 Introduction In this lab various methods and equipment were used to show precision with measurements. Precision is how close the measurements to one another when multiple trials are completed, not to be confused with accuracy where the results are close to a
known value. The main focus with the investigation was to be able to use proper procedures, measuring techniques, find the precision and accuracy with the results, and proper use of significant figures while various equations were used. An additional focus with the lab was the relationship between density, mass, and volume. In order to better understand all information presented within the lab various trials were conducted and all data was collected. This is helpful to comprehend the error in our measurements and various ways lab equipment is used. Procedure To begin the lab all proper materials were gathered for the lab. The first part of the investigation was to weigh out approximately 1g of sand using a watch glass and scale. Following the measuring out the mass of sand, density of water within different type of volume measuring glassware needed to be determined. Types of glassware used were a buret, beaker, graduated cylinder, and an Erlenmeyer flask. For each trial a consistent volume was used for the water, for example, the beaker contained 50mL of water for each trial. Additionally, each trial temperature of the water was measured to determine what theoretical density would be selected. After volume and temperature were measured, the glassware was weighed on the scale to determine the mass. All of this data was recorded for the individual pieces of glassware and all received three trials each. The mass and volume were then used to calculate the density of the water for each trial, and the final number for each measurement was the average of all the results from the three trials. Finally, after all data was collected percent error was calculated from the actual value and experimental value.

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