Chapter 1. Pre-lab Experiment 2: Mixtures

Introduction

Pre-Lab Experiment 2 Quiz
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Question 1

{Which statement best describes dichloromethane?,Which statement best describes organic solvents?,Dichloromethans is a suspected carcinogen. Why is it used in this experiment?}
{An organic solvent in which many organic substances are soluble.,Dichoromethane is an example of an organic solvent.,It is an organic solvent capable of dissolving organic substances in the unknown sample.}
{An organic solvent in which many inorganic substances are soluble.,Water is an example of an organic solvent.,It has a relatively low boiling point.}
{An inorganic solvent in which many organic substances are soluble.,Inorganic substances are usually quite soluble in organic solvents.,It is a very strong solvent able to dissolve the entire unknown sample and form a solution.}
{A solvent in which both and inorganic substances are usually soluble.,Carbonates (CO32-) are very soluble in organic solvents because both the solute and the solvent include carbon.,It reacts 1:1 with the unknown sample and this relationship makes calculations easier.}
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Which statement best describes dichloromethane?, Which statement best describes organic solvents?, Dichloromethans is a suspected carcinogen. Why is it used in this experiment?[2]
An organic solvent in which many organic substances are soluble., Dichoromethane is an example of an organic solvent., It is an organic solvent capable of dissolving organic substances in the unknown sample.[2]
An organic solvent in which many inorganic substances are soluble., Water is an example of an organic solvent., It has a relatively low boiling point.[2]
An inorganic solvent in which many organic substances are soluble., Inorganic substances are usually quite soluble in organic solvents., It is a very strong solvent able to dissolve the entire unknown sample and form a solution.[2]
A solvent in which both and inorganic substances are usually soluble., Carbonates (CO32-) are very soluble in organic solvents because both the solute and the solvent include carbon., It reacts 1:1 with the unknown sample and this relationship makes calculations easier.[2]

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B.
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D.
Correct.
Incorrect.
 

Question 2

Which statement best describes how a centrifuge assists with separating the components in a mixture?

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D.
Correct.
Incorrect.
 

Question 3

{Fe2O3,Fe2O3,Fe2CO3,Fe2CO3}
{Pb(NO3)2,safrole (C10H10O2), PbCO3, PbCO3 }
{water,an organic solvent,an organic solvent, water}
{one,two,three,four}
{0,1,2,3}
Fe2O3, Fe2O3, Fe2CO3, Fe2CO3[2]
Pb(NO3)2, safrole (C10H10O2), PbCO3, PbCO3 [2]
water, an organic solvent, an organic solvent, water[2]
one, two, three, four[2]
{The Fe2O3 remains a solid but the Pb(NO3)2 dissolves,The Fe2O3 remains a solid but the safrole dissolves,Both compounds remain solids,Both compounds remain solids}
{ Both compounds remain solids, Both compounds remain solids, Both compounds dissolve, Both compounds dissolve}
{ Both compounds dissolve, Both compounds dissolve,The FeCO3 remains a solid but the PbCO3 dissolves,The FeCO3 remains a solid but the PbCO3 dissolves}
{The Pb(NO3)2 remains a solid but the Fe2O3 dissolves,The safrole remains a solid but the Fe2O3 dissolves,The PbCO3remains a solid but the FeCO3 dissolves,The PbCO3remains a solid but the FeCO3 dissolves}
The Fe2O3 remains a solid but the Pb(NO3)2 dissolves, The Fe2O3 remains a solid but the safrole dissolves, Both compounds remain solids, Both compounds remain solids[2]
Both compounds remain solids, Both compounds remain solids, Both compounds dissolve, Both compounds dissolve[2]
Both compounds dissolve, Both compounds dissolve, The FeCO3 remains a solid but the PbCO3 dissolves, The FeCO3 remains a solid but the PbCO3 dissolves[2]
The Pb(NO3)2 remains a solid but the Fe2O3 dissolves, The safrole remains a solid but the Fe2O3 dissolves, The PbCO3remains a solid but the FeCO3 dissolves, The PbCO3remains a solid but the FeCO3 dissolves[2]

A mixture of two solids, Fe2O3 and safrole (C10H10O2), is added to an organic solvent. What happens?

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Correct.
Incorrect.
 

Question 4

{A solid sample is added to dichloromethane and centrifuged. ,A solid sample is added to dichloromethane and centrifuged. ,A solid sample is added to dichloromethane and centrifuged. ,A solid sample is added to dichloromethane and centrifuged. ,A solid sample is added to dichloromethane in a test tube and centrifuged.}
{The resulting decantate is allowed to evaporate but no solid is recovered i.e. all of the decantate simply evaporates. ,The resulting decantate is allowed to evaporate and a solid is recovered. , The resulting decantate is removed. Water is then added to the remaining solid and an extraction is performed.,The resulting decantate is removed. Water is then added to the remaining solid and an extraction is performed. The decantate from this second extraction is evaporated but no solid is recovered i.e. all of the decantate simply evaporates., The resulting decantate is removed. Water is then added to the remaining solid and an extraction is performed with the decantate being removed. At this point all of the solid had been removed i.e. no solid remained in the test tube.}
{What inference is consistent with this observation?,What inference is consistent with this observation?,What component is most likely in the decantate from this second extraction?,What inference is consistent with this observation?,What inference is consistent with this observation?}
{The sample did not contain an organic component.,The sample contained an organic component.,The sample’s inorganic component excluding metal carbonates.,The sample did not contain an inorganic component although it may contain metal carbonates.,The sample did not contain a metal carbonate.}
{The sample did not contain an inorganic component.,The sample contained an inorganic component.,The sample’s metal carbonate component.,The sample did not contain an organic component.,The sample did not contain an inorganic component although it may contain metal carbonates.}
{The sample did not contain a metal carbonate.,The sample contained a metal carbonate.,The sample’s organic component.,The sample did not contain a metal carbonate.,The sample did not contain an organic component.}
{The sample is a pure substance not a mixture.,The sample is a pure substance not a mixture.,The sample’s inorganic components including metal carbonates.,The sample is a pure substance not a mixture.,The sample is a pure substance not a mixture.}
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A solid sample is added to dichloromethane and centrifuged., A solid sample is added to dichloromethane and centrifuged., A solid sample is added to dichloromethane and centrifuged., A solid sample is added to dichloromethane and centrifuged., A solid sample is added to dichloromethane in a test tube and centrifuged.[2]
The resulting decantate is allowed to evaporate but no solid is recovered i.e. all of the decantate simply evaporates., The resulting decantate is allowed to evaporate and a solid is recovered., The resulting decantate is removed. Water is then added to the remaining solid and an extraction is performed., The resulting decantate is removed. Water is then added to the remaining solid and an extraction is performed. The decantate from this second extraction is evaporated but no solid is recovered i.e. all of the decantate simply evaporates., The resulting decantate is removed. Water is then added to the remaining solid and an extraction is performed with the decantate being removed. At this point all of the solid had been removed i.e. no solid remained in the test tube.[2]
What inference is consistent with this observation?, What inference is consistent with this observation?, What component is most likely in the decantate from this second extraction?, What inference is consistent with this observation?, What inference is consistent with this observation?[2]
The sample did not contain an organic component., The sample contained an organic component., The sample’s inorganic component excluding metal carbonates., The sample did not contain an inorganic component although it may contain metal carbonates., The sample did not contain a metal carbonate.[2]
The sample did not contain an inorganic component., The sample contained an inorganic component., The sample’s metal carbonate component., The sample did not contain an organic component., The sample did not contain an inorganic component although it may contain metal carbonates.[2]
The sample did not contain a metal carbonate., The sample contained a metal carbonate., The sample’s organic component., The sample did not contain a metal carbonate., The sample did not contain an organic component.[2]
The sample is a pure substance not a mixture., The sample is a pure substance not a mixture., The sample’s inorganic components including metal carbonates., The sample is a pure substance not a mixture., The sample is a pure substance not a mixture.[2]

A solid sample is added to dichloromethane and centrifuged. The resulting decantate is removed. Water is then added to the remaining solid and an extraction is performed. What component is most likely in the decantate from this second extraction?

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B.
C.
D.
Correct.
Incorrect.
 

Question 5

{Which statement best describes naphthalene?,Which statement best describes zinc acetate?,Which statement best describes sodium chloride?,Which statement best describes nickel carbonate?}
{It would be classified as “component X” in the lab separation scheme.,It would be classified as “component Y” in the lab separation scheme.,It would be classified as “component Y” in the lab separation scheme.,It would be classified as “component Z” in the lab separation scheme.}
{It would be classified as “component Y” in the lab separation scheme.,It would be classified as “component X” in the lab separation scheme.,It would be classified as “component X” in the lab separation scheme.,It would be classified as “component X” in the lab separation scheme.}
{It would be classified as “component Z” in the lab separation scheme.,It would be classified as “component Z” in the lab separation scheme.,It would be classified as “component Z” in the lab separation scheme.,It would be classified as “component Y” in the lab separation scheme.}
{It would not be included in the lab separation scheme.,It would not be included in the lab separation scheme.,It would not be included in the lab separation scheme.,It would not be included in the lab separation scheme.}
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Which statement best describes naphthalene?, Which statement best describes zinc acetate?, Which statement best describes sodium chloride?, Which statement best describes nickel carbonate?[2]
It would be classified as “component X” in the lab separation scheme., It would be classified as “component Y” in the lab separation scheme., It would be classified as “component Y” in the lab separation scheme., It would be classified as “component Z” in the lab separation scheme.[2]
It would be classified as “component Y” in the lab separation scheme., It would be classified as “component X” in the lab separation scheme., It would be classified as “component X” in the lab separation scheme., It would be classified as “component X” in the lab separation scheme.[2]
It would be classified as “component Z” in the lab separation scheme., It would be classified as “component Z” in the lab separation scheme., It would be classified as “component Z” in the lab separation scheme., It would be classified as “component Y” in the lab separation scheme.[2]
It would not be included in the lab separation scheme., It would not be included in the lab separation scheme., It would not be included in the lab separation scheme., It would not be included in the lab separation scheme.[2]

Which statement best describes sodium chloride?

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D.
Correct.
Incorrect.
 

Question 6

A student began this experiment with a sample that had an initial mass of 0.6527 g. In the lab they calculated the following:

Mass of organic solid component= 0.3498 g

Mass of soluble inorganic component = 0.1305 g

[.4-.6,4]
[.41-.61,4]
[.5-.8,4]
round(0.6527*0.5359,4)
round((0.6527-0.3498)* 0.4307,4)
round( ( 0.3498/0.6527)*100,1)
round((0.1305/0.6527)*100,1)
round((( 0.6527-0.3498-0.1305)/0.6527)*100,1)

What percentage of the mass was from the organic solid component?

FB :What percentage of the mass was from the soluble inorganic component?

What percentage of the mass was from the insoluble inorganic component?

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