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Berard Section 2.1 Quiz (9/5/18)

Terms in this set (48)

measurements
determines the quality of something based on a standard
the measurements have errors due to the precision of the measuring tool, math is accurate numbers
How is measurements in chemistry unlike math and why?
how do you find an error of a measurement?
you divide the scale by 2 and that is its error
plus or minus error is roughly what?
half of the scale amount
what do measurements include?
a number and unit
what is the abbreviation of "Systeme International d'Unites"?
SI
SI base units
used to identify a property of something independent of other properties
times abbreviation
t (lowercase)
SI base unit of time
seconds
seconds abbreviation
s (lowercase)
what instrument measures time?
a timer or clock
abbreviation of length/distance
length: l
distance: d
(both lowercase)
SI base unit of length/distance
meters
abbreviation of meter
m (lowercase)
abbreviation of mass
m (lowercase)
SI base unit of mass
kilograms
abbreviation of kilograms
kg
what instrument measures mass?
balance
what instrument measures length /distance?
meter stick
abbreviation of temperature
T (capital)
SI base unit of temperature
kelvin
abbreviation unit of kelvin
K (capital)
what instrument measures temperature?
thermometer
abbreviation of amount of a substance
n (lower case)
SI base unit of amount of a substance
mole
abbreviation unit of mole
mol
what instrument measures an amount of a substance?
indirect measurement;
balance--> mass convert to moles
what letters do we capitalize for SI base units?
T for temperature
K for Kelvin
for fahrenheit, water freezes at ____ and boils at _____.
freezes: 32 degrees F
boils: 212 degrees F
for celsius, water freezes at ____ and boils at _____.
freezes: 0 degrees C
boils: 100 degrees C
Kelvin is based off of what?
amount of thermal energy
for kelvin, water freezes at _____ and boils at ______.
freezes: 273 K
boils: 373 K
thermal energy
the vibrational (kinetic) energy at the molecular level
zero-K
the ABSOLUTE ZERO temperature where matter is at its lowest thermodynamic energy state.
derived unit
a unit defined by a combination of base units. (speed- d/t ; density- m/v ; volume)
volume
length x width x height; it measures the amount of space an object TAKES UP
metric unit for volume
Liters
abbreviation of liter
L (capital)
what is the abbreviation "cc"?
for cubic centimeters; used in the medical field
when do we used mL?
in density and most other chemistry problems
solution concentration
derived unit describing the amount of a substance (grams/moles) dissolved in a solution
what other measurement can be used for SOLUTION concentration?
grams per liter (g/L)
molarity solution concentration
this is measured in moles (counting of atoms) per liter represented with mol/L
density
describes the amount of mass per unit volume (m/v)
what is density to matter? meaning what?
density is a physical property of matter; the value does not change if you cut a piece of the matter off.
mass
the amount of matter that is contained in the object
what is density measured in?
g/mL (grams per mL)
how do you find the volume of an irregular shaped object?
water displacement
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