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Chemistry
Ahigh school student acquired an emission spectrum of an unknown sample. he knew the unknown sample contained one of the elements, whose spectra are show below. the emission spectrum
Chemistry
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10
Chemistry
Which statement correctly compares an atom of an alkali metal with an atom of the alkaline earth metal next to it on the periodic table? the alkali metal atom forms a +1 ion,
Chemistry
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170
Chemistry
Why is studying atoms and their parts and particles to people?
Chemistry
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83
Chemistry
Question 1 (true/false worth 4 points) (03.06 lc) an instantaneous dipole occurs when a molecule's moving electrons are briefly more concentrated in one place than another, causing
Chemistry
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48
Chemistry
Classify each of these reactions. ba(clo3)2(s)⟶bacl2(s)+3o2(g)ba(clo3)2(s)⟶bacl2(s)+3o2(g) acid–base neutralization precipitation redox none of the above 2nacl(aq)+k2s(aq)⟶na2s(aq)+2kcl(aq)2nacl(aq)+k2s(aq)⟶na2s(aq)+2kcl(aq)
Chemistry
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7
Chemistry
Which of these, if dissolved in 1.0 l of pure water, would produce a buffer solution? which of these, if dissolved in 1.0 l of pure water, would produce a buffer solution? 0.1
Chemistry
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1
Chemistry
Explain, i don't understand.7. for the combustion of ethyl alcohol as described in the above equation, which of the following is true? 8. the total volume of hydrogen gas is needed
Chemistry
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1
Chemistry
Pollen is located in the
receptacle
ovary
anther
which one, plz answer correctly !
Chemistry
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1
Chemistry
What is the mass of neon that exerts a pressure of 720. mmhg, with a temperature of -15.0 °c , when the volume of the container is 760. ml?
Chemistry
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Chemistry
What is the electron pair arrangement around the central atom in the molecule if5? a.) trigonal pyramidal b.) square planar c.) octahedral d.) square pyramidal
Chemistry
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1
Chemistry
Calculate the molar solubility of cd(oh)2 when buffered at a ph = 12.30. the ksp for cd(oh)2 is 2.5 x 10-14. calculate the molar solubility of cd(oh)2 when buffered at a ph =
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Chemistry
Agaseous mixture contains 434.0 torr h 2 ( g ) , 434.0 torr h2(g), 389.9 torr n 2 ( g ) , 389.9 torr n2(g), and 77.9 torr ar ( g ) . 77.9 torr ar(g). calculate the mole fraction,
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Chemistry
Name two nineteenth century scientists—one who developed the laboratory burner in common use today, and the other who studied the spectra of colored flames produced by a variety
Chemistry
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1
Chemistry
What 3 factors affect precipitation of a region
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3
Chemistry
Glycerol (c3h8o3, 92.1 g/mol) is a nonvolatile nonelectrolyte substance. consider that you have an aqueous solution that contains 34.4 % glycerol by mass. if the vapor pressure
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History
The leadership of this empire was weakened by a civil war.
a
inca
b
both
c
aztec
the conquistadors made alliances with native americans against this empire.
a
inca
b
both
c
aztec
the leader of this empire was killed during the conquest.
a
aztec
b
inca
c
both
a smallpox epidemic weakened this empire's ability to defend against invasion.
a
inca
b
aztec
c
both
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1 minute ago
Mathematics
Order of operations with integers
solve with steps:
-18 + (-24) divide by 6
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1 minute ago
English
In scene 1, tybalt says ,"what, drown and talk of peace? i hate the word/ as i hate hell, all montagues, and thee ./ have thee, coward ! " (lines 63-65). what can you infer ahout tybalts personality and his role in the play, based in these words?
m
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1 minute ago
Chemistry
Identify each section of the periodic table.
metals
nonmetals
metalloids
s
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2 minutes ago
Biology
What are the four major macromolecules
m
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