Determination of the Height of Aluminum Foil - utilizing significant figures

Learning Intention: We are learning to make inferences to determine significant figures in data and calculations to gauge the level of accuracy. Success Criteria:Determine the number of significant figures in measurements (standard and calculated)Round measurements to the correct number of significant figures based on the precision of the measurement.Take measurements and use the density formula to calculate mass, volume, and density. Background Information: Significant Figure Practice: Height (Thickness) of Aluminum Foil Significant figures are important to show the precision of your answer. This is important in science and engineering because no measuring device can make a measurement with 100% precision. Using Significant figures allows the scientist to know how precise the answer is, or how much uncertainty there is. Significant figure example Another look at significant figures. Data table: Return to this table throughout the lab to record your data. Individual Data Measurement Unit of Measurement The volume of water in the graduated cylinder 50 mL Mass of aluminum pellets g Volume of water and pellets in graduated cylinder mL Length of aluminum foil cm Width of aluminum foil cm Mass of aluminum foil cm Step 1: Put on your goggles and read the directions. Fill a 100 mL graduated cylinder with about 50 mL of tap water and record the volume in the table above. Be sure to use as many significant figures as possible and include units. Step 1: Put on your goggles and read the directions. Fill a 100 mL graduated cylinder with about 50 mL of tap water and record the volume in the table above. Be sure to use as many significant figures as possible and include units. Step 2: Find the mass of the weighing boat, add 30.0 g – 40.0g of aluminum pellets, determine the new mass, and subtract the values, record the mass of just the pellets in the table. Step 2: Find the mass of the weighing boat, add 30.0 g – 40.0g of aluminum pellets, determine the new mass, and subtract the values, record the mass of just the pellets in the table. Step 3: Carefully add the pellets to your graduated cylinder and record the final volume including water and pellets in the table. Step 3: Carefully add the pellets to your graduated cylinder and record the final volume including water and pellets in the table. Step 4: Volume of the Aluminum Foil Measure with the best accuracy you can the length and width of your piece of aluminum foil. Record it on the table. (use centimeters) Step 4: Volume of the Aluminum Foil Measure with the best accuracy you can the length and width of your piece of aluminum foil. Record it on the table. (use centimeters) Step 5: Volume of the Aluminum Foil Mass your piece of foil on the triple beam balance and record the mass on the table. Step 5: Volume of the Aluminum Foil Mass your piece of foil on the triple beam balance and record the mass on the table. Do you feel you met the goals so far? Time to calculate! Clean up your area, wash your hands, and return to you seat to complete the calculations. Show all work and use the correct number of significant figures. Keep in mind that 1 cm3 = 1 mL. These units will be interchangeable in your calculations. Calculate the volume of the Aluminum pellets. (include units) Calculate the density of Aluminum using your measurements. (D = m Determine the volume of aluminum foil. V = m Use the mass of the foil from your data table and the density you calculated above. Determine the thickness (height) of Aluminum foil Now the final goal. To calculate the thickness or height of the foil we need to use the formula V = l x w x h. Solve the formula for h and plug in your data. Determine your accuracy. Calculate the percent error for the density of aluminum. The accepted value is 2.70 g Reminder, the percent error formula is (experimental value-accepted value) value x 100 What is one takeaway you learned?