CHM 113 FINAL QUESTIONS &
ANSWERS 100% CORRECT
Density - ANSWERthe ratio of mass to volume of a substance
Specific Gravity - ANSWERthe ratio of the density of the substance to the density of
water
Intensive Property - ANSWERphysical property not dependent on the size of the
sample
Extensive Property - ANSWERdepends on the size of the sample
For a piece of wood having:
Length = 10.35 cm
Width = 6.42 cm
Height = 1.90 cm
Mass = 72.412 g
Calculate the density - ANSWERd = m/v
d = (72.412)/(10.35*6.45*1.90)
d = 0.571 g/cm^3
Why do things have a high density and others have a low density? - ANSWERIt
depends on how atoms are arranged in a space and the temperature of the
substance.
Why is density an important physical property? - ANSWERIt can help us identify a
substance because density is an intensive property meaning it is independent of the
"size" of the sample.
Which determination of density do YOU think has a highest error? Why? -
ANSWERDensity of plastic. There may be different densities at which the PVC
would levitate. Also the method is very indirect.
A cylinder has:
diameter = 1.28 cm
height = 3.85 cm
mass = 39.730 g
What is its density? - ANSWERd = 39.730/4.954
d = 8.019 g/cm^3
A rock weighs:
143 g in air
82 g in H2O
mass displaced?
volume H2O displaced?
density? - ANSWERV = 61g/cm^3
, 1. 61g
2. 61g
3. 143/61 = 2.344 g/cm^3
A graduated cylinder weighs 28.102 g. A solution has been created which levitates a
piece of PVC. The graduated cylinder containing 6.25 mL of that solution weighs
34.200 g. Density? - ANSWERd = (34.200 - 28.102)/6.25
Increasing denisty - ANSWER1 - gas
2 - liquid
3 - solid
Increasing density of H2O - ANSWER1 - gas
2 - solid
3 - liquid
If an object has a density of 0.5g/mL, will it float or sink when placed in water? Why?
- ANSWERIt will float in water because it is less dense than water which has a
density of 1g/mL
A rock has a mass of 20g in air, and 10g in water. Density of the rock? - ANSWERd
= 20/10
d = 2g/cm^3
If a 10 mL solution with a density of 1.5g/mL levitates a 1 g piece PVC, what is the
density of the PVC? - ANSWERdensity of PVC = density of solution
A cylinder has a diameter of 1.6mm, a height of 2 cm and a mass of 50 g. Density? -
ANSWERd = 50/0.0402
d = 1243.78 g/cm^3
Units of density - ANSWERg/cm^3 or g/mL
Which determination of density do YOU think has the lowest error? Why? -
ANSWERDensity of the wood block. The experiment was performed multiple times
and it is the most direct way of calculating density.
Conversion factor: cm^3 to mL - ANSWERnone. they are equal.
What can be said about the structure of ice and water? - ANSWERIce has a
crystalline structure due to hydrogen bonding which is different than the structure of
water which is fluid.
What property of adipic acid is used in the separation? - ANSWERsolubility
Why do we use fluted filter paper? - ANSWERFluted filter paper has a greater
surface area which allows for a more rapid rate of filtration.
ANSWERS 100% CORRECT
Density - ANSWERthe ratio of mass to volume of a substance
Specific Gravity - ANSWERthe ratio of the density of the substance to the density of
water
Intensive Property - ANSWERphysical property not dependent on the size of the
sample
Extensive Property - ANSWERdepends on the size of the sample
For a piece of wood having:
Length = 10.35 cm
Width = 6.42 cm
Height = 1.90 cm
Mass = 72.412 g
Calculate the density - ANSWERd = m/v
d = (72.412)/(10.35*6.45*1.90)
d = 0.571 g/cm^3
Why do things have a high density and others have a low density? - ANSWERIt
depends on how atoms are arranged in a space and the temperature of the
substance.
Why is density an important physical property? - ANSWERIt can help us identify a
substance because density is an intensive property meaning it is independent of the
"size" of the sample.
Which determination of density do YOU think has a highest error? Why? -
ANSWERDensity of plastic. There may be different densities at which the PVC
would levitate. Also the method is very indirect.
A cylinder has:
diameter = 1.28 cm
height = 3.85 cm
mass = 39.730 g
What is its density? - ANSWERd = 39.730/4.954
d = 8.019 g/cm^3
A rock weighs:
143 g in air
82 g in H2O
mass displaced?
volume H2O displaced?
density? - ANSWERV = 61g/cm^3
, 1. 61g
2. 61g
3. 143/61 = 2.344 g/cm^3
A graduated cylinder weighs 28.102 g. A solution has been created which levitates a
piece of PVC. The graduated cylinder containing 6.25 mL of that solution weighs
34.200 g. Density? - ANSWERd = (34.200 - 28.102)/6.25
Increasing denisty - ANSWER1 - gas
2 - liquid
3 - solid
Increasing density of H2O - ANSWER1 - gas
2 - solid
3 - liquid
If an object has a density of 0.5g/mL, will it float or sink when placed in water? Why?
- ANSWERIt will float in water because it is less dense than water which has a
density of 1g/mL
A rock has a mass of 20g in air, and 10g in water. Density of the rock? - ANSWERd
= 20/10
d = 2g/cm^3
If a 10 mL solution with a density of 1.5g/mL levitates a 1 g piece PVC, what is the
density of the PVC? - ANSWERdensity of PVC = density of solution
A cylinder has a diameter of 1.6mm, a height of 2 cm and a mass of 50 g. Density? -
ANSWERd = 50/0.0402
d = 1243.78 g/cm^3
Units of density - ANSWERg/cm^3 or g/mL
Which determination of density do YOU think has the lowest error? Why? -
ANSWERDensity of the wood block. The experiment was performed multiple times
and it is the most direct way of calculating density.
Conversion factor: cm^3 to mL - ANSWERnone. they are equal.
What can be said about the structure of ice and water? - ANSWERIce has a
crystalline structure due to hydrogen bonding which is different than the structure of
water which is fluid.
What property of adipic acid is used in the separation? - ANSWERsolubility
Why do we use fluted filter paper? - ANSWERFluted filter paper has a greater
surface area which allows for a more rapid rate of filtration.
