Chem 120 Final | 130 Questions and Answers
with Complete Solutions 100% Correct | Latest
Update 2025
scientific notation - ANSWER 3.94 x 10⁷= 39400000
0.000008 = 8.0 x 10⁻⁶
measured v. exact numbers - ANSWER measured = obtained through
measurement and are uncertain
exact = obtained through counting and are certain
precision v. accuracy - ANSWER precision = close to each other
accuracy = close to the actual number
conversion factor - ANSWER a ratio of equivalent measurements used to
convert a quantity from one unit to another
density - ANSWER d = m/v
specific gravity - ANSWER SG = density of substance / density of water
properties of elements - ANSWER only one type of material
made up of atoms
,properties of compound - ANSWER made of 2 or more elements chemically
combined in the same proportion, made up of molecules
properties of a mixture - ANSWER made of 2 or more substances physically
combined
∙heterogenous: contains two or more phases (ex: soda, OJ)
∙homogenous: contains a uniform composition (ex: salt water)
physical change - ANSWER composition remains the same but state, size, or
appearance change (ex: grinding chalk into a powder)
chemical change - ANSWER conversion of a substance into different substance
(ex: rusting iron)
temperature - ANSWER water boils at = 212°F, 100°C, and 373K
water freezes at = 32°F, 0°C, and 273K
specific heat - ANSWER q= mc∆T
q= heat energy
m= mass
c= specific heat
∆T= change in temperature
food calories - ANSWER protein= 4 calories in a gram
, fat= 9 calories in a gram
carb= 4 calories in a gram
properties of metals - ANSWER Metals left/below metalloid line=
∙solid at room temp
∙shiny
∙malleable= can be beaten into sheet/foil
∙ductile= can be drawn into wire
∙conduct heat and electricity well
∙most have high densities and high melting points
properties of nonmetals - ANSWER Right/ above metalloid line=
∙relatively low freezing and boiling points
∙relatively low densities
∙brittle
∙dull
∙insulating
properties of metalloids - ANSWER On metalloid line=
∙somewhat malleable
∙somewhat shiny
∙semi-conductive
∙intermediate density
∙sometimes considered nonmetals
with Complete Solutions 100% Correct | Latest
Update 2025
scientific notation - ANSWER 3.94 x 10⁷= 39400000
0.000008 = 8.0 x 10⁻⁶
measured v. exact numbers - ANSWER measured = obtained through
measurement and are uncertain
exact = obtained through counting and are certain
precision v. accuracy - ANSWER precision = close to each other
accuracy = close to the actual number
conversion factor - ANSWER a ratio of equivalent measurements used to
convert a quantity from one unit to another
density - ANSWER d = m/v
specific gravity - ANSWER SG = density of substance / density of water
properties of elements - ANSWER only one type of material
made up of atoms
,properties of compound - ANSWER made of 2 or more elements chemically
combined in the same proportion, made up of molecules
properties of a mixture - ANSWER made of 2 or more substances physically
combined
∙heterogenous: contains two or more phases (ex: soda, OJ)
∙homogenous: contains a uniform composition (ex: salt water)
physical change - ANSWER composition remains the same but state, size, or
appearance change (ex: grinding chalk into a powder)
chemical change - ANSWER conversion of a substance into different substance
(ex: rusting iron)
temperature - ANSWER water boils at = 212°F, 100°C, and 373K
water freezes at = 32°F, 0°C, and 273K
specific heat - ANSWER q= mc∆T
q= heat energy
m= mass
c= specific heat
∆T= change in temperature
food calories - ANSWER protein= 4 calories in a gram
, fat= 9 calories in a gram
carb= 4 calories in a gram
properties of metals - ANSWER Metals left/below metalloid line=
∙solid at room temp
∙shiny
∙malleable= can be beaten into sheet/foil
∙ductile= can be drawn into wire
∙conduct heat and electricity well
∙most have high densities and high melting points
properties of nonmetals - ANSWER Right/ above metalloid line=
∙relatively low freezing and boiling points
∙relatively low densities
∙brittle
∙dull
∙insulating
properties of metalloids - ANSWER On metalloid line=
∙somewhat malleable
∙somewhat shiny
∙semi-conductive
∙intermediate density
∙sometimes considered nonmetals
