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Embed code for: 9-9n12 MatterD7 Density LAB
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TEST next class!
Is density a/an extensive physical, intensive physical, or chemical property of matter? Pick one: Items that are more/less dense than water will float. Pick one: Items with higher densities have more mass/volume per unit space. True/False? A substance can be identified by its density. Have your LAB out where Ms. V./Mr. Miles can see. Objectives: I will know (knowledge): 1) how to manipulate the density equation and units 2) all vocabulary for the TEST – next class! I will be able to (skill): 3) identify unknown metals in lab 4) keep track of significant figures in ALL calculations! Agenda: Any questions over pre-lab? Density Lab Lab procedures Data collection Lab clean-up & analysis TEST REVIEW MUST SHOW WORK TO EARN CREDIT Check your answers, WITH units: M = 22 g DAu =19.3 g/mL, MAg = 15.8 g V = 1670 cm3 V = 13100 cm3 V = 2700 cm3 = 2700 mL = 2.7 L M = 2500 g V = 2.79 cm3 V = 0.225 cm3 D = 2.7 g/mL Pre-lab questions #1-5: READ through the procedure. You will be working in groups of 2. 1ST CHEMISTRY TEST – Next class! CHAPTERS 2 & 3 from notes & text. Utilize your NOTES, BOOK, & unit REVIEW to study. READ through the lab. You will be working in groups of 2. WRITE ON YOUR OWN SHEET OF PAPER. Name, Block, Title of Lab: Problem Statement/Objective Materials Prelab Questions, answered Brief Procedure, written as you do it. Data Table & Observations Analysis & Conclusion 1. Take 1 metal sample from the materials table- NOTICE which letter cup it’s from and RECORD in your data table. 2. Weigh the metal sample at the “Mass Station”. RECORD in your data table. 3. Lab partner in meantime- pour water into your graduated cylinder- RECORD volume of water in data table. 4. Carefully slide metal sample into graduated cylinder with the water. RECORD volume of water&sample in data table. 5. Dry off metal sample, return to CORRECT cup. Repeat for 3 more metals. (4 total) Make sure you measure the “vol. of water” each time. Don’t assume the water level will be the same for each trial. Do NOT waste water! No faucet should be left running. Use a beaker & re-use the same water! Make sure you measure the volume to the correct estimated decimal place Ex. 35.2 mL the 2 was estimated, this was between the 35 and 36mL lines. You need to calculate the “volume of sample” (see #1 under the table) You need to calculate each sample’s density (*MAKE SURE you use the correct volume!) Record these densities under Question #1: Aluminum = 2.70 g/mL Copper = 8.96 g/mL Iron = 7.87 g/mL Lead= 11.34 g/mL Tin = 7.29 g/mL Zinc = 7.14 g/mL Steel = 7.85 g/mL Brass = 8.3 g/mL WRITE ON YOUR OWN SHEET OF PAPER. Lab reports should progress in this order: Name, Block, Title of Lab: Problem Statement/Objective Materials Prelab Questions, answered Data Table & Observations Brief Procedure, written AFTER you did it. Analysis (any Post-Lab questions or procedural questions answered here.) Conclusion (either answer the problem statement or state how you met the objective) ALL parts of the lab should be completed, even the questions on the back- DUE NEXT CLASS. All lab stations should be cleaned up before the end of class. This means: All metals returned to appropriate cups. Graduated cylinders emptied of water. No water left on countertops. All paper towels have made it to the trash can. All scales are accounted for. Units Review: How far is a second? Minute Physics Metric units are made of _______ & ________ What’s larger, km or mm? What’s larger, μ L or cL? How many grams are in 1 kg? Atlantic/Pacific Guideline? Addition/Subtraction Math Rule? Multiplication/Division Math Rule? Let’s look at #13-18 on your homework: Pass out unit review here. * * Pass out unit review here. * *