CHEM 105- EXAM 1 QUESTIONS AND
ANSWERS
Which of the following expressions is false?
A) 1 L = 1 dm^3
B) 100 cm^3 = 10^-1 dm^3
C) 1 dm^3 = 1 mL
D) 1 m^3 = 1000 mm^3
E) 10^-6 mm^3 = 10^-3 um^3 - Correct Answers -D) 1 m^3 = 1000 mm^3
Mixture - Correct Answers -a combination of two or more substances in which the
substances retain their distinct identities.
Homogenous mixture - Correct Answers -composition of the mixture is the same
throughout
Heterogeneous mixture - Correct Answers -composition is not uniform throughout
Physical means - Correct Answers -can be used to separate a mixture into its pure
components
Element - Correct Answers -a substance that cannot be separated into simpler
substances by chemical means
Compound - Correct Answers -a substance composed of atoms of two or more
elements chemically united in fixed proportions
Compounds can only be separated separated into their pure components by ________
means. - Correct Answers -chemical
Physical change - Correct Answers -does not alter the composition or identity of a
substance. ex. sugar dissolving in water
Chemical change - Correct Answers -alters the compositions or identity of the
substance(s) involved. ex. hydrogen burns in air to form water
Extensive property - Correct Answers -depends upon how much matter is being
considered. ex. mass, length, volume
, Intensive property - Correct Answers -does not depend upon how much matter is being
considered. ex. density, temperature, color
Matter - Correct Answers -anything that occupies space and has mass
Mass - Correct Answers -measure of the quantity of matter
Kilogram - Correct Answers -SI unit of mass 1 kg=1000g
Volume - Correct Answers -SI derived unit for volume is cubic meter
Density - Correct Answers -SI derived unit for density is kg/m^3
d= - Correct Answers -m/v
m= - Correct Answers -dxv
K= - Correct Answers -C+273.15
273.15K= - Correct Answers -0 C
373.15K= - Correct Answers -100 C
F= - Correct Answers -9/5 x C + 32
32 F= - Correct Answers -0 C
212 F= - Correct Answers -100 C
Accuracy - Correct Answers -how close a measurement is to the true value
Precision - Correct Answers -how close a set of measurements are to each other
If all units cancel except for the _________, then the problem was solved correctly. -
Correct Answers -desired unit(s)
A compound can be separated into its constituent elements by physical means. -
Correct Answers -False
A mixture can be separated into its constituent chemical substances by physical means.
- Correct Answers -True
What would be the length in centimeters of one side of a cube that has a volume of one
liter? - Correct Answers -10 cm
ANSWERS
Which of the following expressions is false?
A) 1 L = 1 dm^3
B) 100 cm^3 = 10^-1 dm^3
C) 1 dm^3 = 1 mL
D) 1 m^3 = 1000 mm^3
E) 10^-6 mm^3 = 10^-3 um^3 - Correct Answers -D) 1 m^3 = 1000 mm^3
Mixture - Correct Answers -a combination of two or more substances in which the
substances retain their distinct identities.
Homogenous mixture - Correct Answers -composition of the mixture is the same
throughout
Heterogeneous mixture - Correct Answers -composition is not uniform throughout
Physical means - Correct Answers -can be used to separate a mixture into its pure
components
Element - Correct Answers -a substance that cannot be separated into simpler
substances by chemical means
Compound - Correct Answers -a substance composed of atoms of two or more
elements chemically united in fixed proportions
Compounds can only be separated separated into their pure components by ________
means. - Correct Answers -chemical
Physical change - Correct Answers -does not alter the composition or identity of a
substance. ex. sugar dissolving in water
Chemical change - Correct Answers -alters the compositions or identity of the
substance(s) involved. ex. hydrogen burns in air to form water
Extensive property - Correct Answers -depends upon how much matter is being
considered. ex. mass, length, volume
, Intensive property - Correct Answers -does not depend upon how much matter is being
considered. ex. density, temperature, color
Matter - Correct Answers -anything that occupies space and has mass
Mass - Correct Answers -measure of the quantity of matter
Kilogram - Correct Answers -SI unit of mass 1 kg=1000g
Volume - Correct Answers -SI derived unit for volume is cubic meter
Density - Correct Answers -SI derived unit for density is kg/m^3
d= - Correct Answers -m/v
m= - Correct Answers -dxv
K= - Correct Answers -C+273.15
273.15K= - Correct Answers -0 C
373.15K= - Correct Answers -100 C
F= - Correct Answers -9/5 x C + 32
32 F= - Correct Answers -0 C
212 F= - Correct Answers -100 C
Accuracy - Correct Answers -how close a measurement is to the true value
Precision - Correct Answers -how close a set of measurements are to each other
If all units cancel except for the _________, then the problem was solved correctly. -
Correct Answers -desired unit(s)
A compound can be separated into its constituent elements by physical means. -
Correct Answers -False
A mixture can be separated into its constituent chemical substances by physical means.
- Correct Answers -True
What would be the length in centimeters of one side of a cube that has a volume of one
liter? - Correct Answers -10 cm
