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
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
Why is the adipic acid solution heated? - ANSWERwhen the adipic acid is heated it
dissolves completely
What can be said about the other physical properties of pure compounds? -
ANSWERWhen there are impurities is changes these physical properties. i.e.
melting point can be lower is a compound is impure.
Qualitative analysis - ANSWERidentify the constituents present in a substance
Quantitative analysis - ANSWERmeasurement of the quantities of particular
constituents present in a substance
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
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.
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.
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
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
Why is the adipic acid solution heated? - ANSWERwhen the adipic acid is heated it
dissolves completely
What can be said about the other physical properties of pure compounds? -
ANSWERWhen there are impurities is changes these physical properties. i.e.
melting point can be lower is a compound is impure.
Qualitative analysis - ANSWERidentify the constituents present in a substance
Quantitative analysis - ANSWERmeasurement of the quantities of particular
constituents present in a substance
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
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.
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.
