Density Notes



Density Notes

Science 8 TEMS

Mucci

I. Density

a. the mass per unit of volume of a material

b. a value that describes how compact matter is

A. Formulas to calculate Density:

a. D = M/V

b. V = M/D

c. M = D x V

B. Some common units of Density:

a. g/ml

b. g/cm3

c. Kg/L

C. Most common Density:

a. Water

i. 1.0 g/ml

ii. 1.0 g/cm3

iii. 1.0 Kg/L

1. Anything with a density above 1.0 g/ml will SINK.

2. Anything with a density below 1.0 g/ml will FLOAT.

D. Example Problem

a. Doug’s toy block has a mass of 24 grams and a volume of 6 ml. What is the density of Doug’s block?

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E. More Problems

a. What is the density of a piece of cork that has a mass of 0.65 g and a volume of 2.71 cm3?

b. What is the density of a piece of concrete that has a mass of 8.76 g and a volume 3.07 cm3?

c. Limestone has a density of 2.72g/cm3. What is the mass of 24.9 cm3of limestone?

d. Illegal ivory is sometimes detected on the basis of density. What is the density of a sample of ivory whose volume is 14.5cm3 and whose mass is 26.8g?

e. An archeologist finds that a piece of ancient pottery has a mass of 0.61g and a volume of 0.26cm3. What is the density of the pottery?

f. Calcium chloride is used as a deicer on roads in the winter. It has a density of 2.5g/cm3. What is the mass of 7.62cm3 of this substance?

g. An object having a mass of 24.0g is immersed in 15cm3 of water. The total volume of the water and object is 22cm3. Calculate the density of the object. Be sure to express your answer in proper units.

h. A block of magnesium whose volume is 10.0cm3 has a mass of 17.0g. What is the density of magnesium?

i. A mixture of two white solids is placed in a test tube, and the mass of the tube and its contents is found to be 33.66g. The tube is stoppered, and the apparatus is arranged to collect any gas produced. When the tube is gently heated, a gas is given off and its volume is found to be 470.0cm3. After the reaction, the mass of the test tube and its contents is found to be 33.16g.

i. What is the mass of the gas collected?

ii. What is the density of the gas collected?

j. The volume of gas generated by treating 1.0g of magnesium carbonate with 8.8g of sulfuric acid is 200cm3. The remaining acid and solid have a mass of 9.4g.

i. What is the density of the gas?

k. If the volume of gas in the preceding problem is compressed to a volume of just 50cm3, what will the density of the gas now be?

l. To what volume must the gas be compressed before it will reach a density of 1.0g/cm3?

m. A piece of lead has a mass of 22.7g. It occupies a volume of 2.00cm3. What is the density of lead?

n. A piece of lead occupies a volume of 4.00cm3. What is the mass of the lead in grams? Kilograms?

o. A piece of lead has a mass of .302kg. What volume does it occupy in ml? L?

p. The volume of a certain wooden block is 63cm3. The mass is 11.39g. Find the density.

q. The density of copper is 4.44g/cm3. If the mass of a piece of copper is 26.32g, find the volume.

r. Sodium has a density of 1.95g/cm3. If the volume of some sodium is 9.0cm3, what is the mass?

s. The mass of a toy spoon is 7.5g, and its volume is 3.2ml. What is the density of the toy spoon?

t. A mechanical pencil has the density of 3g/cm3. The volume of the pencil is 15.8 cm3. What is the mass of the pencil?

u. A screwdriver has the density of 5.5 grams per cubic centimeter. It also has the mass of 2.3 grams. What is the screwdrivers volume?

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Gas

Liquid

Solid

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