Question

5. A student was asked to determine the density of an object in lab. The sample was first weighed on the scale and had a mass of 14.67 grams. The student needed to measure the volume, but the shape was not easily measured with a ruler so it had to be measured in a graduated cylinder. The starting volume was 10.0 mL and the ending volume was 11.6 mL. The accepted value for the density of this object is 8.908 g/mL. Show your work and use proper significant digits throughout the problem. Your answer should include: -Calculation of the density of the object using the obtained data -Calculation of the percent error of the experiment -If the sample size was 1,000 times what was used in lab, would the density still be the same? Explain your answer.

          5. A student was asked to determine the density of an
object in lab. The sample was first weighed on the scale
and had a mass of 14.67 grams. The student needed to
measure the volume, but the shape was not easily
measured with a ruler so it had to be measured in a
graduated cylinder. The starting volume was 10.0 mL and
the ending volume was 11.6 mL. The accepted value for
the density of this object is 8.908 g/mL.
Show your work and use proper significant digits
throughout the problem. Your answer should include:
-Calculation of the density of the object using the
obtained data
-Calculation of the percent error of the experiment
-If the sample size was 1,000 times what was used in
lab, would the density still be the same? Explain
your answer.

Show more…

5. A student was asked to determine the density of an
object in lab. The sample was first weighed on the scale
and had a mass of 14.67 grams. The student needed to
measure the volume, but the shape was not easily
measured with a ruler so it had to be measured in a
graduated cylinder. The starting volume was 10.0 mL and
the ending volume was 11.6 mL. The accepted value for
the density of this object is 8.908 g/mL.
Show your work and use proper significant digits
throughout the problem. Your answer should include:
-Calculation of the density of the object using the
obtained data
-Calculation of the percent error of the experiment
-If the sample size was 1,000 times what was used in
lab, would the density still be the same? Explain
your answer.

Added by Larry W.

Chemistry: Structure and Properties

Nivaldo Tro 2nd Edition

Instant Answer

Solved by Expert Brooke Smith

09/07/2022

Step 1

- The starting volume in the graduated cylinder is 10.0 mL. - The ending volume in the graduated cylinder is 11.6 mL. - The volume of the object is the difference between the ending volume and the starting volume. \[ \text{Volume of the object} = 11.6 \, Show more…

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Transcript

00:01 Okay, so here we want to determine the density of an object in the lab.

00:05 So we know the mass is 14 .67 grams, and the student solved for the volume by using the displacement method.

00:15 So what density is, it's a mass over a volume.

00:18 Typically, it's grams over milliliters.

00:21 And density is always going to be in the same ratio for the same object.

00:25 Density is an intrinsic property.

00:28 It's not dependent on the amount of your substance you have.

00:31 It's dependent only on the substance itself.

00:34 So here we have the mass, and we need to solve for the amount of grams that, or sorry, the amount of volume that this object has.

00:43 So by using the displacement method, when you put it in a graduated cylinder, once the object is in, the volume of the water gets displaced, and whatever this difference is, it's going to be equal to the volume of the object.

00:59 So the ending volume was 11 .6 millimeters, and the starting volume was 10mm.

01:06 And so the difference between these two, if we take one, if we take the final and subtract it, subtract the initial out, we get a volume of 1 .6 milliliters, and that's the volume of the object.

01:18 So here, significant figures, we keep our one decimal spot, and when we go to solve for the density, we'll have 14 .67 grams divided by 1 .6 milliliters, so our answer should have two significant figures...

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