Specific gravity is a physical property. Beakers hold three clear, colorless liquids A, B, and C. The values of the specific gravities of the liquids are measured and then listed in the “Before freezing” column. The beakers are placed in a freezer until a solid crust forms across the surface of each. The beakers are placed in a freezer until a solid crust forms across the surface of each. The crusts are removed, and the liquids are warmed to room temperature. Their specific gravities are measured again, and then their values are listed in the “After Freezing” column. Which beaker(s) contain(s) a pure substance, and which contain a mixture? Explain your reasoning
Specific gravity is a physical property. Beakers hold three clear, colorless liquids A, B, and C. The values of the specific gravities of the liquids are measured and then listed in the “Before freezing” column. The beakers are placed in a freezer until a solid crust forms across the surface of each. The beakers are placed in a freezer until a solid crust forms across the surface of each. The crusts are removed, and the liquids are warmed to room temperature. Their specific gravities are measured again, and then their values are listed in the “After Freezing” column. Which beaker(s) contain(s) a pure substance, and which contain a mixture? Explain your reasoning
Solution Summary: The author explains that a physical property is used to measure the state of the physical system.
Specific gravity is a physical property. Beakers hold three clear, colorless liquids A, B, and C. The values of the specific gravities of the liquids are measured and then listed in the “Before freezing” column. The beakers are placed in a freezer until a solid crust forms across the surface of each. The beakers are placed in a freezer until a solid crust forms across the surface of each. The crusts are removed, and the liquids are warmed to room temperature. Their specific gravities are measured again, and then their values are listed in the “After Freezing” column. Which beaker(s) contain(s) a pure substance, and which contain a mixture? Explain your reasoning
4. Draw and label all possible isomers for [M(py)3(DMSO)2(CI)] (py = pyridine, DMSO
dimethylsulfoxide).
The emission data in cps displayed in Table 1 is reported to two decimal places by the
chemist. However, the instrument output is shown in Table 2.
Table 2. Iron emission from ICP-AES
Sample
Blank
Standard
Emission, cps
579.503252562
9308340.13122
Unknown Sample
343.232365741
Did the chemist make the correct choice in how they choose to display the data up in Table
1? Choose the best explanation from the choices below.
No. Since the instrument calculates 12 digits for all values, they should all be kept and not truncated.
Doing so would eliminate significant information.
No. Since the instrument calculates 5 decimal places for the standard, all of the values should be
limited to the same number. The other decimal places are not significant for the blank and unknown
sample.
Yes. The way Saman made the standards was limited by the 250-mL volumetric flask. This glassware
can report values to 2 decimal places, and this establishes our number of significant figures.
Yes. Instrumental data…
Chapter 2 Solutions
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