1 Exampromax - Stuvia US 2025/2026
JMU Chem 120 Final Questions and Answers
(100% Correct Answers) Already Graded A+
Quiz: scientific notation⼀Answer: 3.94 x 10⁷= 39400000
0.000008 = 8.0 x 10⁻⁶
Quiz: measured v. exact numbers⼀Answer: measured = obtained
through measurement and are uncertain
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exact = obtained through counting and are certain
Exampromax - Stuvia US
Quiz: precision v. accuracy⼀Answer: precision = close to each other
accuracy = close to the actual number
Quiz: conversion factor⼀Answer: a ratio of equivalent measurements
used to convert a quantity from one unit to another
Quiz: density⼀Answer: d = m/v
Quiz: specific gravity⼀Answer: SG = density of substance / density of
water
Quiz: properties of elements⼀Answer: only one type of material
made up of atoms
, 2 Exampromax - Stuvia US 2025/2026
Quiz: properties of compound⼀Answer: made of 2 or more elements
chemically combined in the same proportion, made up of molecules
Quiz: properties of a mixture⼀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)
Quiz: physical change⼀Answer: composition remains the same but
state, size, or appearance change (ex: grinding chalk into a powder)
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Exampromax - Stuvia US
Quiz: chemical change⼀Answer: conversion of a substance into
different substance (ex: rusting iron)
Quiz: temperature⼀Answer: water boils at = 212°F, 100°C, and 373K
water freezes at = 32°F, 0°C, and 273K
Quiz: specific heat⼀Answer: q= mc∆T
q= heat energy
m= mass
c= specific heat
∆T= change in temperature
Quiz: food calories⼀Answer: protein= 4 calories in a gram
fat= 9 calories in a gram
carb= 4 calories in a gram
, 3 Exampromax - Stuvia US 2025/2026
Quiz: properties of metals⼀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
Quiz: properties of nonmetals⼀Answer: Right/ above metalloid line=
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∙relatively low freezing and boiling points
∙relatively low densities
Exampromax - Stuvia US
∙brittle
∙dull
∙insulating
Quiz: properties of metalloids⼀Answer: On metalloid line=
∙somewhat malleable
∙somewhat shiny
∙semi-conductive
∙intermediate density
∙sometimes considered nonmetals
Quiz: composition of atom⼀Answer: atomic number= number of
protons
mass number= number of nucleons, distinguishes isotopes
Quiz: composition of ion⼀Answer: cation= positively charged ion,
more protons than electrons (loss of electrons)
JMU Chem 120 Final Questions and Answers
(100% Correct Answers) Already Graded A+
Quiz: scientific notation⼀Answer: 3.94 x 10⁷= 39400000
0.000008 = 8.0 x 10⁻⁶
Quiz: measured v. exact numbers⼀Answer: measured = obtained
through measurement and are uncertain
© 2025 Assignment Expert
exact = obtained through counting and are certain
Exampromax - Stuvia US
Quiz: precision v. accuracy⼀Answer: precision = close to each other
accuracy = close to the actual number
Quiz: conversion factor⼀Answer: a ratio of equivalent measurements
used to convert a quantity from one unit to another
Quiz: density⼀Answer: d = m/v
Quiz: specific gravity⼀Answer: SG = density of substance / density of
water
Quiz: properties of elements⼀Answer: only one type of material
made up of atoms
, 2 Exampromax - Stuvia US 2025/2026
Quiz: properties of compound⼀Answer: made of 2 or more elements
chemically combined in the same proportion, made up of molecules
Quiz: properties of a mixture⼀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)
Quiz: physical change⼀Answer: composition remains the same but
state, size, or appearance change (ex: grinding chalk into a powder)
© 2025 Assignment Expert
Exampromax - Stuvia US
Quiz: chemical change⼀Answer: conversion of a substance into
different substance (ex: rusting iron)
Quiz: temperature⼀Answer: water boils at = 212°F, 100°C, and 373K
water freezes at = 32°F, 0°C, and 273K
Quiz: specific heat⼀Answer: q= mc∆T
q= heat energy
m= mass
c= specific heat
∆T= change in temperature
Quiz: food calories⼀Answer: protein= 4 calories in a gram
fat= 9 calories in a gram
carb= 4 calories in a gram
, 3 Exampromax - Stuvia US 2025/2026
Quiz: properties of metals⼀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
Quiz: properties of nonmetals⼀Answer: Right/ above metalloid line=
© 2025 Assignment Expert
∙relatively low freezing and boiling points
∙relatively low densities
Exampromax - Stuvia US
∙brittle
∙dull
∙insulating
Quiz: properties of metalloids⼀Answer: On metalloid line=
∙somewhat malleable
∙somewhat shiny
∙semi-conductive
∙intermediate density
∙sometimes considered nonmetals
Quiz: composition of atom⼀Answer: atomic number= number of
protons
mass number= number of nucleons, distinguishes isotopes
Quiz: composition of ion⼀Answer: cation= positively charged ion,
more protons than electrons (loss of electrons)
