Which of the solids making up the mixture you are given is an ionic compound?

Chemistry: The Molecular Science
5th Edition
ISBN:9781285199047
Author:John W. Moore, Conrad L. Stanitski
Publisher:John W. Moore, Conrad L. Stanitski
Chapter13: The Chemistry Of Solutes And Solutions
Section: Chapter Questions
Problem 16QRT
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Which of the solids making up the mixture you are given is an ionic compound?

 

Preparing the mixture: Prepare the plastic pieces by shredding or cutting pieces of a
yogurt container (or other polypropylene container). In a 250 mL beaker, weigh 1.0 gram
each of the paper clip, the rice/beans, the table salt and the cut-up pieces of plastic. Mix
them well using a glass rod.
Transcribed Image Text:Preparing the mixture: Prepare the plastic pieces by shredding or cutting pieces of a yogurt container (or other polypropylene container). In a 250 mL beaker, weigh 1.0 gram each of the paper clip, the rice/beans, the table salt and the cut-up pieces of plastic. Mix them well using a glass rod.
Exploiting density differences to separate the rice grains/beans and polypropylene: All
of the solid materials that remained after step (3) are at the bottom of the 100 mL beaker.
Next, add enough water to the solids in the 100 mL beaker so the polypropylene is easily
seen floating on the surface. Carefully pour off (i.e., decant) both the water and the
polypropylene into another 100 mL beaker so the rice grains/beans stay at the bottom of
the beaker. You may need to repeat the decantation several times to achieve good
separation. (Do not use fingers or tweezers to separate the plastic pieces). Dry the
polypropylene by air drying it for several minutes on a piece of paper towel. Carefully
collect the polypropylene into a tared sample vial and determine its mass.
For the rice grains/beans left in the beaker, use a plastic pipette to remove as much water
as possible. Dry the grains or beans in the beaker by evaporation/air drying for several
hours or overnight. When the solid has dried, transfer the dried grains to a tared sample
vial and determine its mass.
Transcribed Image Text:Exploiting density differences to separate the rice grains/beans and polypropylene: All of the solid materials that remained after step (3) are at the bottom of the 100 mL beaker. Next, add enough water to the solids in the 100 mL beaker so the polypropylene is easily seen floating on the surface. Carefully pour off (i.e., decant) both the water and the polypropylene into another 100 mL beaker so the rice grains/beans stay at the bottom of the beaker. You may need to repeat the decantation several times to achieve good separation. (Do not use fingers or tweezers to separate the plastic pieces). Dry the polypropylene by air drying it for several minutes on a piece of paper towel. Carefully collect the polypropylene into a tared sample vial and determine its mass. For the rice grains/beans left in the beaker, use a plastic pipette to remove as much water as possible. Dry the grains or beans in the beaker by evaporation/air drying for several hours or overnight. When the solid has dried, transfer the dried grains to a tared sample vial and determine its mass.
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