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Praxis 5435 Exam | Questions And Answers Latest {} A+ Graded | 100% Verified
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Praxis 5435 Exam | Questions And Answers Latest {} A+ Graded | 100% Verified
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Praxis 5435 Exam | Questions And Answers Latest {2024- 2025} A+ Graded | 100%Verified
Volumetric Flask - used for making liquid solutions of precise volumes, bulb shaped with narrow tube
Erlenmeyer flask - Used for mixing, transporting, and reacting
Burette - a graduated glass tube with a tap at one end, for delivering known volumes of a liquid,
especially in titrations.
Titration - a measured amount of a solution of unknown concentration is added to a known volume of a
second solution until the reaction between them is just complete
Determines endpoint of a reaction
light microscope - aka optical, microscope that uses a beam of light passing through one or more
(compound) lenses to magnify an object
Digital microscope - A type of Microscope that use a camera and a monitor to allow viewing the sample.
scanning electron microscope - a microscope that produces an enlarged, three-dimensional image of an
object by using a beam of electrons rather than light
Graticule slide - It is marked with a grid line and is useful only for counting or estimating a quantity.
Chromatography - A technique that is used to separate the components of a mixture
Analyte - substance analyzed or tested, generally by means of laboratory methods
How to dilute acid - Add concentrated acid solution to the water. Put 2/3 total volume of water in grad.
cyl. Add acid. Add water to desired volume.
,Centrifugate - liquid component of solution (clear, not the precipitate), after being separated in
centrifuge.
In blood, blood cells settle and plasma stays on top.
Spectrophotometry - Measures how visible light is abosrbed by a colored solution
Electrophoresis - Separation of particles based on electrical charge
Deka- - 10 (10^1)
Kilo- - 1000 (10^3)
1000 m in km
Hecto- - 100
Mega- - 10^6 (million)
Giga- - 10^9 (billion)
Tera- - 10^12 (trillion)
Peta- - 10^15
Deci- - 10^-1
Centi- - 10^-2
,Milli- - 10^-3
Micro- - 10^-6
Nano- - 10^-9
Pico - 10^-12
femto- - 10^-15
Ampere - unit of electric current
Candela - luminous intensity
Mole - the SI base unit used to measure the amount of a substance
Avogadro's number - number of representative particles in a mole, 6.02 X 10^23
significant figures - 1. Non-zeros
2. Zeros between non-zeros
3. Trailing zeros after non-zeros *if* a decimal is present
Percent error - |expected - observed| / expected
Isotopes - Atoms of the same element that have different numbers of neutrons
Subshells - s, p, d, f
, Noble gases - aka inert gases, Have low boiling points, are all gases at room temperature
Helium, neon, argon, krypton, xenon
Not very reactive
Halogens - -aka salt formers
-often in seawater (NaCl is saltwater)
-Fluorine, chlorine, bromine, iodine
-Bromine is extracted from salt beds from evaporation
-Iodine is extracted from kelp
Alkali metals - -Lithium, sodium, potassium, rubidium, cesium, francium
-Low density, float on water
-HIGHLY reactive, can spontaneously burn
Dmitri Mendeleev - Russian chemist who developed a periodic table of the chemical elements and
predicted the discovery of several new elements (1834-1907)
Atomic weights increase towards the... - Right side of the periodic table (generally)
Periodic table columns... - also called groups or families, have similar chemical behavior
Top right of periodic table - Nonmetals
Middle/left side of periodic table - Metals (except hydrogen)
-High conductivities for heat and electricity
Congener - something of the same kind or nature (elemental groups)
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