Tap the cylinder toforce any air bubbles off the kernels. Place 18-20 popcorn cornels in the graduatedcylinder with the water. Place approximately 5 mL of distilled water inthe graduated cylinder, and record the volume.Ĥ. Define atmospheric pressure (1atm) in terms ofkilopascals, millimeters of mercury, torrs, andbars.Ĥ Chemistry: Matter and Change Chapter 13 ChemLab and MiniLab Worksheetsġ. How do you convert from mass of a compound tomoles of a compound? If you have 5.00 g ofwater, how many moles of water do you have?ĥ. In step 5, why is it important to dry the kernelsbefore moving on with the procedure?Ĥ. To correctly record the volume,which part of the meniscus do you read? Howmany digits do you write down when you recordthe measured volume?ģ. Water forms a meniscus when poured into a grad-uated cylinder. The ideal gas law can be used to find the pres-sure in the kernel as it bursts.Ģ. Hard or soft water Calculate the pressureĭesign steps to controlexperimental errorĬylinder250-mL beakerbeaker tongs balance distilled waterpaper towelsĭetermine Pressure inPopcorn KernelsWhen the water vapor pressure inside a popcorn kernelis great enough, the kernel bursts and releases thewater vapor. ProblemHow much pressure isrequired to burst a kernelof popcorn? Safety Precautions Read and observe all cautions listed on the aerosol can of Interpret Do your observations and calculations support the use of carbon dioxide gas toextinguish fires? Explain.ĬhemLab and MiniLab Worksheets Chemistry: Matter and Change Chapter 13 3 Recall that you will need to calculate the molar mass of each gas inorder to calculate densities.ģ. Calculate the room-temperature densities in grams per liter of carbon dioxide, oxygen,and nitrogen gases. Apply Calculate the molar volume of carbon dioxide gas (CO2) at room temperatureand atmospheric pressure.Ģ. While the reaction in the beaker is actively producing carbon dioxide gas, carefullypour the gas, but not the liquid, out of the beaker and into the top of the foil tube.Record your observations.ġ. WARNING: Do not touch the end of the aluminum tube that is nearthe burning candle.ħ. Quickly position the foil cylinder at about 45 up and away from the top of the can-dle flame. Place 30 g of baking soda (NaHCO3) in a large beaker. Keep hair and loose clothing away from the flame.ĥ. WARNING: Run water over the extinguished matchbefore throwing it away. Roll a 23-cm 30-cm piece of aluminum foil into a cylinder that is 30 cm long androughly 6 cm in diameter. Obtain the air pressure with aīarometer or weather ratio. Measure the temperature with a thermometer. Materials masking tape, aluminum foil, metric ruler, beaker, candle, matches, ther-mometer, barometer or weather radio, baking soda (NaHCO3), vinegar (5% CH3COOH) Why is carbon dioxide used in fire extinguishers? 30Ģ Chemistry: Matter and Change Chapter 13 ChemLab and MiniLab Worksheets Maths Skill TransparencyMaster and Worksheets. Teaching TransparencyMaster and Worksheets. Are there any steps in the procedure or lab safety symbols that you do not understand? Explain.Ĭhapter 13 GasesMinilab. Describe the safety procedures and additional warnings that you must follow as you perform this investigation.ĥ. Is this a design-your-own procedure? Circle: Yes NoĤ. Will you be working with a partner or on a team?ģ. What is the purpose of the investigation?Ģ. Your teacher must initial this form before you begin the lab.ġ. Read carefully the entire lab and then answer the following questions. Lab type (circle one) : Launch Lab MiniLab ChemLab Send all inquiries to:Glencoe/McGraw-Hill8787 Orion PlaceColumbus, OH 43240-4027 Any other reproduction, for sale or other use, is expressly prohibited. Permission is granted to reproduce the material contained herein on the condition that such materials be reproduced only for classroom use be provided to students, teachers, and families without charge and be used solely in conjunction with the Glencoe Chemistry: Matter and Change program. Copyright by The McGraw-Hill Companies, Inc.
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