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JMU Chem 120 Final Exam Questions with Solutions
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JMU Chem 120 Final Exam Questions with Solutions
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JMU Chem 120 Final ExamQuestions with Solutions
scientific notation - -3.94 x 10⁷= 39400000
0.000008 = 8.0 x 10⁻⁶
-measured v. exact numbers - -measured = obtained through measurement
and are uncertain
exact = obtained through counting and are certain
-precision v. accuracy - -precision = close to each other
accuracy = close to the actual number
-conversion factor - -a ratio of equivalent measurements used to convert a
quantity from one unit to another
-density - -d = m/v
-specific gravity - -SG = density of substance / density of water
-properties of elements - -only one type of material
made up of atoms
-properties of compound - -made of 2 or more elements chemically
combined in the same proportion, made up of molecules
-properties of a mixture - -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 - -composition remains the same but state, size, or
appearance change (ex: grinding chalk into a powder)
-chemical change - -conversion of a substance into different substance (ex:
rusting iron)
-temperature - -water boils at = 212°F, 100°C, and 373K
water freezes at = 32°F, 0°C, and 273K
-specific heat - -q= mc∆T
q= heat energy
m= mass
c= specific heat
, ∆T= change in temperature
-food calories - -protein= 4 calories in a gram
fat= 9 calories in a gram
carb= 4 calories in a gram
-properties of metals - -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 - -Right/ above metalloid line=
∙relatively low freezing and boiling points
∙relatively low densities
∙brittle
∙dull
∙insulating
-properties of metalloids - -On metalloid line=
∙somewhat malleable
∙somewhat shiny
∙semi-conductive
∙intermediate density
∙sometimes considered nonmetals
-composition of atom - -atomic number= number of protons
mass number= number of nucleons, distinguishes isotopes
-composition of ion - -cation= positively charged ion, more protons than
electrons (loss of electrons)
anion= negatively charged ion, more electrons than electrons (gain of
electrons)
-electromagnetic radiation - -amplitude= height of wave, determines how
bright the light is
wavelength= distance between peaks on a wave, related to color
frequency= number of waves that pass a point in one second
-electromagnetic spectrum - -
-atomic radius - -∙as you go down a column the radius INCREASES
SIGNIFICANTLY
∙as you go across a row the radius DECREASES SLIGHTLY
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