1|Page
CHM095 - Basic Lab Chemistry - Final Assessment
Portage ACTUAL VERIFIED EXAM COMPLETE
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR.pdf||NEWEST EXAM!!
What is the formula for density? - Answer-Density =
mass/volume
What is the unit for density? - Answer-g/mL
how are exact numbers obtained? - Answer-by counting or
by using a definition that compares two units
ex: # of tires on a car, # of eggs in fridge, 100cm=1m, 12
items=1 dozen
What type of numbers are not always exact and have
some degree of uncertainty? - Answer-measured numbers
What are the rules of significant figures? - Answer-1. All
nonzero numbers are always significant.
2. Zeros:
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Leading - never
Captive - always
Trailing - sometimes
3. Exact numbers determined by counting or a definition,
equality, or conversion factor
What are the rules of significant figures in multiplication
and division? - Answer-The number of significant figures in
the result is the same as that in the measurement with the
smallest number of significant figures.
What are the rules of significant figures in addition and
subtraction? - Answer-The limiting term is the one with the
smallest number of decimal places.
What are the metric prefixes you must know? - Answer-
mega (M) - 10^6
kilo (k) - 10^3
deci (d) - 10^-1
centi (c) - 10^-2
milli (m) - 10^-3
micro (u) - 10^-6
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nano (n) - 10^-9
What is a unit conversion factor? - Answer-a ratio of two
equivalent quantities expressed in different measurement
units
Change 18.0 mL to liters with the appropriate number of
SFs - Answer-0.0180
3 SFs are required
Express a volume of 1.250 L in mL with the appropriate
number of SFs - Answer-1250 mL
Express 2.63 pounds in milligrams with the appropriate
number of SFs
1 lb = 453.6 g - Answer-1 190 000 mg
What is matter? - Answer-Anything that has mass and
takes up space
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What is a pure substance? - Answer-either elements or
compounds that always have the same composition
ex: pure H2O, Fe, Al
What are elements? - Answer-fundamental substances
that cannot be broken down into other substances by
chemical means. Found on the periodic table.
ex: iron, aluminum, oxygen, hydrogen
What are compounds? - Answer-a substance composed of
a given combination of elements that can be broken down
into those elements by chemical methods
ex: water (H2O), carbon dioxide (CO2), table sugar
(C12H22O11)
What are the two types of scientific observations? -
Answer-qualitative and quantitative
what type of observation is a quantitative one? - Answer-a
measurement
CHM095 - Basic Lab Chemistry - Final Assessment
Portage ACTUAL VERIFIED EXAM COMPLETE
QUESTIONS AND CORRECT ANSWERS LATEST
UPDATE THIS YEAR.pdf||NEWEST EXAM!!
What is the formula for density? - Answer-Density =
mass/volume
What is the unit for density? - Answer-g/mL
how are exact numbers obtained? - Answer-by counting or
by using a definition that compares two units
ex: # of tires on a car, # of eggs in fridge, 100cm=1m, 12
items=1 dozen
What type of numbers are not always exact and have
some degree of uncertainty? - Answer-measured numbers
What are the rules of significant figures? - Answer-1. All
nonzero numbers are always significant.
2. Zeros:
,2|Page
Leading - never
Captive - always
Trailing - sometimes
3. Exact numbers determined by counting or a definition,
equality, or conversion factor
What are the rules of significant figures in multiplication
and division? - Answer-The number of significant figures in
the result is the same as that in the measurement with the
smallest number of significant figures.
What are the rules of significant figures in addition and
subtraction? - Answer-The limiting term is the one with the
smallest number of decimal places.
What are the metric prefixes you must know? - Answer-
mega (M) - 10^6
kilo (k) - 10^3
deci (d) - 10^-1
centi (c) - 10^-2
milli (m) - 10^-3
micro (u) - 10^-6
,3|Page
nano (n) - 10^-9
What is a unit conversion factor? - Answer-a ratio of two
equivalent quantities expressed in different measurement
units
Change 18.0 mL to liters with the appropriate number of
SFs - Answer-0.0180
3 SFs are required
Express a volume of 1.250 L in mL with the appropriate
number of SFs - Answer-1250 mL
Express 2.63 pounds in milligrams with the appropriate
number of SFs
1 lb = 453.6 g - Answer-1 190 000 mg
What is matter? - Answer-Anything that has mass and
takes up space
, 4|Page
What is a pure substance? - Answer-either elements or
compounds that always have the same composition
ex: pure H2O, Fe, Al
What are elements? - Answer-fundamental substances
that cannot be broken down into other substances by
chemical means. Found on the periodic table.
ex: iron, aluminum, oxygen, hydrogen
What are compounds? - Answer-a substance composed of
a given combination of elements that can be broken down
into those elements by chemical methods
ex: water (H2O), carbon dioxide (CO2), table sugar
(C12H22O11)
What are the two types of scientific observations? -
Answer-qualitative and quantitative
what type of observation is a quantitative one? - Answer-a
measurement
