Thoughts… Short lecture on uncertainty and use of measurement tools prior to activity. Also night need to go over how to calculate percent error (shows up in activity 3) Print each slide in full, laminate/put in sheet protector, and tape to each lab station.

Task 1: Uncertainty in the Measurement of Length Objective: Use a four-sided meter stick to measure and calculate the area of a desk top Directions: 1)Start with the least precise side of meter stick (orange line that is marked with only “1m”. 2)Measure the length and width of your desk and record your data. Include units and uncertainty. 3)Calculate the area using these measurements and record to correct number of significant figures. ** For our purpose, we will leave uncertainty out of calculated area. 4) Repeat steps 1-3 using the other sides of the ruler

Task 2: Uncertainty in the Measurement of Mass Objective: Use several different balances to compare the mass of the same object Pointers and Tips: - Remember to “tare/zero” the electronic balances before using them. Directions: 1)Mass the roll of masking tape on the bathroom scale (least precise) 2)Record your measurement in your data table. 3)Continue to take the mass of the masking tape on each of the available balances. ** Don’t forget to include uncertainty!!!

Task 3: Uncertainty of Different Graduated Cylinders Objective: Record the uncertainty of different graduated cylinders Directions: 1)Study the 3 different-sized graduated cylinders on the lab station. 2)Based on the smallest demarcations on each graduated cylinder, record the amounts of uncertainty in your data table.

Task 4: Measurement of Volume to compare different volumetric tools Objective: Use different volumetric tools (graduated cylinders, beaker, and volumetric flask) to compare measurement of same volume of liquid 1.00g of water = 1.00 cm 3 of water 1 cm 3 of water = 1 mL of water

Task 5: Determining Density Objective: Compare the calculated volume of water with the measured mass of water. Directions: 1)Measure the inside dimensions of a clear plastic box 2)Record measurements including uncertainty 3)Calculate the inside volume of plastic box and record answer in cm 3 (don’t forget significant figures) 4)Fill plastic box with tap water and pour the water into an appropriate sized graduated cylinder. 5)Determine the volume of water and record measurement 6)Fill plastic box with distilled water and determine the mass of water using a triple beam balance. Using all of the information gathered, can you calculate the DENSITY of distilled water? Give it a try!!!

Task 6: Qualitative and Quantitative Observations Objective: Practice making and recording both qualitative and quantitative observations Directions: 1)Obtain a tea light candle 2)Light the candle and observe it 3)Make at least 5 qualitative observations and 5 quantitative observations and record.