CHM1045L_Exp_1_DATA_SHEET

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Broward College *

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CHM1045L

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Chemistry

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Feb 20, 2024

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D A T A S H E E T Name: Octavio Gamez Date: 01/23/2024 Instructor Dr. Maysoon Baker Saleh E X P E R I M E N T 1 Measurements: Mass, Volume, Density, and Boiling Point List all your step-by-step procedures for your mass, volume, and density determinations below. Where applicable, show all your calculations and remember to apply the significant figures rules. Part I — Measuring Mass 1. Measuring Mass Directly: Item Mass A single penny 2.469 g A 150 mL beaker 71.215 g A nickel 5.029 g A 100 mL graduated cylinder 119.310 g A watch glass 96.4 g 2. Measuring Out a Substance (Indirect Measurement): Determine the mass of the following, then record your measurements and write the procedure on how you measured the mass by indirect measurement a substance Procedure: exactly 2.750 g of sodium chloride We place the weighing paper on the balance and press the “tare” button to not include the weight of sodium chloride alone. We carefully and slowly add 2,750 g of the substance

exactly 5.000 g of calcium chloride We place the weighing paper again and repeat the procedure where we carefully and slowly add 5,000 g of Calcium Chloride, this time if we add more than what is needed, we remove the leftovers of the substance and place it in a separate container to discard it. exactly 22.000 g of water To measure the water we will need a beaker to hold the water, we place it and repeat the procedure once again, we add about 22,000 g and then use a dropper to adjust the mass. 3. Determine the Mass by Difference of the following, then record your measurements and write the procedure/or show calculations on how you measured the mass by difference: Procedure/ Calculations: 50 mL of water in a graduated cylinder We place the 50 mL of water in a graduated cylinder and place it on the weight to measure the mass. We include the weight of the cylinder so that we obtain a total of 167.174 g of mass. 1, 2, and 3 scoops of NaCl in succession using a spatula We place a scoop of salt and obtain 2,834 g, we add the second scoop increasing it to 5,817 g, and we finish by adding the third scoop to obtain 8,793 g with what we have collected from the previous scoops. 1 scoop of CaCl 2 before and after it sits out on the lab bench for 15 minutes, where it will absorb moisture from the air We add a scoop and obtain 0.438 g of this substance. If we wait for 15 minutes for it to absorb the water and gain weight to obtain the new weight of how much water was absorbed to know the difference, in total it gives us 0.471 g. Part II — Measuring Volume 1. Volume determination, Read and record the volumes of the liquids in the following the set ups in the lab :

Measuring Device Volume 10 mL graduated cylinder 4.8 mL 100 mL graduated cylinder 90.1 mL Liquid level in buret 42.7 mL Beaker 75 mL Erlenmeyer flask 100 mL 2. Show your calculation for measuring the volume of the following items based on procedure: Calculations: Volume of a 25 × 150 mm test tube: We use a 100 ml cylinder filled with water, transfer and fill the test tube, giving us a total of 44.1 mL. Volume of a golf ball: Using the calculations from the video, the total volume of a golf ball is 40 ml or 40 cubic cm. Volume of about 20 pieces of zinc metal: We add a specific amount of 36.5 mL of liquid volume, we add the zinc and the liquid level will increase to obtain 39.1 mL of volume. Volume of air in an empty rectangular box: 20.8 cm x 8.9 cm x 14.3 cm = 2,647.22 of volume. Part III — Determine the Density of the following Solids and Liquids at Room Temperature Calculations: Density of a golf ball: We measure the golf ball and we obtain 4cm of height and 46.260 g of mass. Density of the provided irregular- shaped solid: We place the object in the exhaust with 74.855 g of dry mass, we place the object in a graduated cylinder with 54 mL of water, the volume increases to 64 mL of water with the object solid.

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Density of Water (use about 10 mL): Graduated cylinder 34.625 g of mass, then with add the water to the cylinder (10 mL), we obtain 44.602 g of mass Density of the unknown liquid (A, B, or C) provided (use about 10 mL): Unknown letter A 37.048 g of mass of an empty cylinder, then we add exactly 10 mL of the unknown liquid, obtaining 45.090 g of mass. Part IV — Determining the Boiling Point of a Liquid Boiling point of ethyl alcohol We start with our 5 millimeter tube, then we put a few drops of ethanol into the seal and place it on the hot water bath to slowly heat it up. When the temperature of the water reaches the temperature of boiling point, the sample is going to start boiling too, it will be shown as bubbles coming out at the end of the capillary tube. If it bubbles too fast, we turn off the flame and wait for the bubbles to stop coming out, then right before the liquid goes up we record the temperature which is 79 C ° Boiling point of unknown liquid Unknown letter: B We start with a new seal tube and secure it with a rubber band into the end of the thermometer to make sure is at the same level as the volvo thermometer. Now we add a few drops (around 5 drops) with the dropper into our new seal tube, wait for the boiling point to turn off the bunsen burner so we could get a temperature of 79 C°