Bell Work DateSPI 0807.9.7 Density

1) The volume of a cylinder is 20 cm3 , and the mass is 2 grams.

Answer these two questions. Do not use a calculator

Density= 20 2

Answer: 0.1 g/cm3

Density= volume mass

Volume: 3cm3

Density: 3.6 g/cm3

2) The density of this cube is 3.6 g/cm3. The volume is 3 cm3.

Compute the density of this cylinder.

Compute the mass.(Round to the nearest whole number)

Mass = Volume x DensityMass = 3 x 3.6

DMV

MVDAnswer: 10.8 rounded to 11 g

SPI 0807.9.7 Density

What is density? Density is the amount of matter (mass)you have crammed in a given space (volume)Reminder: mass is how much matter is in an object The unit for mass is grams (mg or g or kg)Reminder: volume is how much space it takes up (size) Unit for solid volume is cubic meters (cm3 or m3 or km3) Unit for liquid volume is liters (mL or L or kL)

To compute density - divide the mass by the volume of the object

View this YouTube Video Clip:Link: What Is Density Video by TheScienceClassroom.org

ScienceNotes

Mass: 19g Volume: 7cm3

(A)

(D) (C)

(B)

Mass: 12g Volume: 3cm3

4 g/cm32.71 g/cm3

Mass: 11g Volume: 3cm3

3.6 g/cm3

Mass: 23g Volume: 5cm3

4.6 g/cm3

ScienceNotesSPI 0807.9.7

Density Which cube below has the LEAST density?

This time, do not use a calculator.Compute density on your paper while I work it on the board. Show all your work, and

don't Forget Your Units!written like this…g/cm3

ScienceNotesSPI 0807.9.7

Density Answer this question.

Again, do not use a calculator, and show all your work.Compute the density on your paper while I work it on the board.

Density= 90 810.0

Density= volume mass

Answer9 g/cm3

ScienceNotesSPI 0807.9.7

Density Answer this question. Do not use a calculator.

Work it out on your paper while I do it on the board.Show all your work.

Sample A1 g/ml

Sample B0.8 g/ml

Sample C1.08 g/ml

Sample D0.9 g/ml

Sample A

D= 100 100 Sample B

D= 100 80

Sample C

D= 100 108 Sample D

D= 100 90

Don't Forget Your Units!written like this…g/ml

SPI 0807.9.7 Density

ScienceNotes

Density In LiquidsLower density liquids float on top of liquids with higher densityHigher density liquids will sink below lower density liquids

View this YouTube Video Clip:Link: 7-Layer Density Column

SPI 0807.9.7 Density

ScienceNotes

Density In LiquidsLower density liquids float on top of liquids with higher densityHigher density liquids will sink below lower density liquids

Here is a density column with 6 liquids

06

05

04

03

02

01

The top liquid (06)-least densityThe bottom liquid (01)-greatest density

One liquid has a density of 2.5 g/mLOne liquid has a density of 0.7 g/mLOne liquid has density of 1.7 g/mLQuestion: Which of these liquids would be on the bottom, and which one would be on top?Bottom: 2.5 g/mL (liquid 01) -greatest densityTop: 0.7 g/mL (liquid 06) -least density

SPI 0807.9.7 Density

ScienceNotes

Density Teaching Ideas