Anna, Anh and Amir are each given a sample of an unknown polymer and asked to ca
ID: 1550320 • Letter: A
Question
Anna, Anh and Amir are each given a sample of an unknown polymer and asked to calculate the density of their sample to determine if it could be polyaniline. They find a published value for the density of polyaniline to be 1.33 g cm-3.
Amir quotes his final experimental value of the density of his sample with its uncertainty to be 1.36 ± 0.01 g cm-3.
Select as many of the following statements that would be supported by Amir’s result.
Incorrect answers will score negative (zero minimum mark).
This question is weighted DOUBLE the value of each of other questions.
The sample may be polyaniline, but contains other substances which are ONLY less dense than polyaniline.
The measurements are not precise enough to determine whether or not the sample is polyaniline.
The equipment used to measure the mass is not precise enough to determine whether or not the sample is polyaniline.
The published value for the density of polyaniline is incorrect.
The equipment used to measure the volume is not precise enough to determine whether or not the sample is polyaniline.
The sample may be polyaniline, but a systematic error may be present in the technique.
The equipment used to measure the volume is inaccurate.
The sample may be polyaniline, but contains some other substances which are less dense than polyaniline.
The sample is not polyaniline.
The measurements are precise enough to determine whether or not the sample is polyaniline.
The sample is polyaniline.
The sample may be polyaniline, but contains other substances which are ONLY more dense than polyaniline.
The equipment used to measure the mass is inaccurate.
The sample may be polyaniline, but contains some other substances which are more dense than polyaniline.
The equipment used to make the measurements are inaccurate.
The sample may be polyaniline, but the uncertainty has been underestimated.
aThe sample may be polyaniline, but contains other substances which are ONLY less dense than polyaniline.
bThe measurements are not precise enough to determine whether or not the sample is polyaniline.
cThe equipment used to measure the mass is not precise enough to determine whether or not the sample is polyaniline.
dThe published value for the density of polyaniline is incorrect.
eThe equipment used to measure the volume is not precise enough to determine whether or not the sample is polyaniline.
fThe sample may be polyaniline, but a systematic error may be present in the technique.
gThe equipment used to measure the volume is inaccurate.
hThe sample may be polyaniline, but contains some other substances which are less dense than polyaniline.
iThe sample is not polyaniline.
jThe measurements are precise enough to determine whether or not the sample is polyaniline.
kThe sample is polyaniline.
lThe sample may be polyaniline, but contains other substances which are ONLY more dense than polyaniline.
lThe equipment used to measure the mass is inaccurate.
mThe sample may be polyaniline, but contains some other substances which are more dense than polyaniline.
nThe equipment used to make the measurements are inaccurate.
oThe sample may be polyaniline, but the uncertainty has been underestimated.
Explanation / Answer
The equipment used to measure the volume is not precise enough to determine whether or not the sample is polyaniline.
The sample may be polyaniline, but a systematic error may be present in the technique.
The sample may be polyaniline, but contains some other substances which are less dense than polyaniline.
The measurements are precise enough to determine whether or not the sample is polyaniline.
The sample is polyaniline.
The sample may be polyaniline, but contains some other substances which are more dense than polyaniline.
The sample may be polyaniline, but the uncertainty has been underestimated.
eThe equipment used to measure the volume is not precise enough to determine whether or not the sample is polyaniline.
fThe sample may be polyaniline, but a systematic error may be present in the technique.
hThe sample may be polyaniline, but contains some other substances which are less dense than polyaniline.
jThe measurements are precise enough to determine whether or not the sample is polyaniline.
kThe sample is polyaniline.
mThe sample may be polyaniline, but contains some other substances which are more dense than polyaniline.
oThe sample may be polyaniline, but the uncertainty has been underestimated.
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