Name: _________________________________________ Seat: _____ Date: _________________ Period: ______ Name: _________________________________________ Seat: _____ Chemistry Lab Worksheet Determining Quantitative Data on Material Samples Introduction Today you and your lab partner will be determining gram, mole, and particle quantities of selected material samples. Materials: aluminum foil, table sugar, table salt, water, baking soda, vinegar, beakers, balance, graduated cylinders, lab notebook, and pencils Procedure: 1. Come up to Mr. C’s desk and get a sample of a substance and a Quantitative Evaluation Sheet. 2. Determine the identity of your sample. It will be one of the substances listed on the front board. 3. Determine the mass of the sample, and then convert the mass to moles and particles. 4. Fill in the information in the Data Table below. 5. Return the sheet and your sample to Mr. C. 6. Repeat steps 1-5 with another Quantitative Evaluation Sheet, up to three total. Data Table Quantitative Evaluation Sheet # Identity of Substance Mass of Sample (g) Convert to Moles of Sample (mol) Convert to Number of Particles in Sample (atoms or molecules) Problem: Chemical analysis of citric acid shows that it contains 37.51% C, 4.20% H, and 58.29% O. What is its empirical formula?