chemistry oct2011
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1. Who is said to be the founderof the scientic method?
C. Galileo Galilei
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2. In the universe, it is anythingthat occupies space and hasmass.
. !atter
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". #lectron came from the gree$%ord&
C. mber
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'. Which of the follo%ing fallsunder (uids?
). both a * c.
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+. he state of matter %hichoccupies the %hole spaceavailable is
. gas
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-. It is a property of matter%hich can be measured bychanging the identity andcomposition of a substance.
. Chemical
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. Which of the follo%ing is notan e/tensive property?
C. 0oiling point
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. What do you call chemicallyidentical atoms of the sameelement but %ith dierentnumbers of neutrons anddierent mass numbers.
C. Isotopes
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3. ritium has
C. 1 proton and 2 neutron
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14. What is the most abundantelement in the universe?
0. hydrogen
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11. What is the most abundant
element in the #arth5satmosphere?
. nitrogen
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12. he net electrical charge ofan atom under normal state is&
C. neutral
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1". substance that cannot bedecomposed into simplersubstances by ordinarychemical reactions
C. #lement
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1'. he subdivision of anelement that can ta$e part in achemical reaction
). tom
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1+. he sub6atomic partconsisting of neutrons andprotons is $no%n as
0. 7ucleons
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1-. he no. of protons in the
nucleus on an atom. tomic number
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1. he no. of protons andneutrons in the nucleus of anatom
0. !ass number
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1. 1 amu is appro/imatelye8ual to
). 1.-- / 14 9 62 $g
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24. What do you call theelectrons in the outermostorbitals?
. :alence electrons
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21. Calculate the mass of theproduct of reaction of -.+' g of;inc %ith ".21 g of sulfur.
C. 3.+ g
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22. Calculate the mass of theo/ygen that reacts %ith 1.2' gof methane <natural gas= toform ".'1 g of carbon dio/ideand 2.3 g of %ater.
). '.3- g
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2". Calculate the atomic mass ofan element if -4.'> of theatoms have a mass of -.32+amu and the rest have a massof 4.32'3 amu.
0. -3. amu
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ractice roblem&
Calculate the percentage of bromineatoms that have a mass of .31"amu and the percentage that have
a mass of 4.31-" amu. heatomic mass of bromine is 3.343amu, and theses are the only t%o
naturally occurring isotopes.C. +4.'>, '3.->
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2+. Calculate the formula massof <7@'=2@A' <one type of
fertili;er=.
0. 1"2 amu
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2-. Calculate the number of
moles of l atoms in +.+ /142' l atoms.
0. 3.++ mol l atoms
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2. Calculate the number of
moles of @2 molecules in +.+ /142' @2 molecules.
0. 3.++ mol @2 molecules
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2. Calculate the number of
molecules in "4 g 7@".
. 1.4- / 142' molecules
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23. In a +.446g sample of carbon,
ho% many of the atoms have amass of 12.41 amu?
. 7one
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"4. Calculate the empirical
formula of Bhypo, used inphotographic development,consisting of 23.1> 7a, '4.+>
D, and "4.'> A.). 7a2D2A"
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"1. Calculate the molecular
formula of a compound %ithmolar mass 14' gEmolcomposed of 32."> carbon and
.> hydrogen.
. C1@1
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"2. he reaction 7a2A F @2A
27aA@ illustrates a
. Dynthesis eaction
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"". he reaction 0a<A@=2 F
2CuC7D 0a<C7D=2 F 2CuA@is an e/ample of
0. !etathesis eaction
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"'. he decomposition of a
given compound can be carriedout
). either by passing electriccurrent or heating
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"+. Calculate the molarity of a
2+46mH solution containing4.4 mmol of solute.
0. 4."24 !
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"-. Calculate the number of
moles of solute re8uired toma$e +4.44 mH of 1.+44 !solution
C. 4.4+ mol
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". Calculate the molarity of a
solution after 1.4 H of 2.4- !solution is diluted to 2.+4 H.
). 1.'4 !
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". Calculate the mole fraction of a
solution of 4.41+ mol of 7aCl in+4.4 g of %ater if the solution has adensity of 1.42 gEmH.
. 4.44+"-
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"3. Calculate the molality of an
alcohol in a8ueous solution ifthe mole fraction of the alcoholis 4.1+4.
C. 3.4 m alcohol
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'4. 0attery acid is the common
name for
). sulfuric acid
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'1. When one element causes
the o/idation of anotherelement, it is
C. reduced
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'2. ccording to the 0ronsted
heory, an acid is
. a proton donor
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'". he p@ of an acid solution is
. "
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''. he p@ of a solution %ith a
hydrogen ion concentration of1 / 14" is
. F"
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'+. he p@ concentration of a
solution that has a hydro/ideion concentration of 1 / 146' molEH is
C. 14
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'-. 146- ! @Cl solution is
diluted to 144 times. he p@ ofthe diluted solution %ould be
. bet%een - to
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'. substance %hich can act
both an acid and a base is&
0. amphoteric