Chemistry Oct2011

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1. Who is said to be the founderof the scientic method?

C. Galileo Galilei



2. In the universe, it is anythingthat occupies space and hasmass.

. !atter



". #lectron came from the gree$%ord&

C. mber



'. Which of the follo%ing fallsunder (uids?

). both a * c.



+. he state of matter %hichoccupies the %hole spaceavailable is

. gas



-. It is a property of matter%hich can be measured bychanging the identity andcomposition of a substance.

. Chemical



. Which of the follo%ing is notan e/tensive property?

C. 0oiling point



. What do you call chemicallyidentical atoms of the sameelement but %ith dierentnumbers of neutrons anddierent mass numbers.

C. Isotopes



3. ritium has

C. 1 proton and 2 neutron



14. What is the most abundantelement in the universe?

0. hydrogen



11. What is the most abundant

element in the #arth5satmosphere?

. nitrogen



12. he net electrical charge ofan atom under normal state is&

C. neutral



1". substance that cannot bedecomposed into simplersubstances by ordinarychemical reactions

C. #lement



1'. he subdivision of anelement that can ta$e part in achemical reaction

). tom



1+. he sub6atomic partconsisting of neutrons andprotons is $no%n as

0. 7ucleons



1-. he no. of protons in the

nucleus on an atom. tomic number



1. he no. of protons andneutrons in the nucleus of anatom

0. !ass number



1. 1 amu is appro/imatelye8ual to

). 1.-- / 14 9 62 $g





24. What do you call theelectrons in the outermostorbitals?

. :alence electrons



21. Calculate the mass of theproduct of reaction of -.+' g of;inc %ith ".21 g of sulfur.

C. 3.+ g



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



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



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.->



2+. Calculate the formula massof <7@'=2@A' <one type of

fertili;er=.

0. 1"2 amu



2-. Calculate the number of

moles of l atoms in +.+ /142' l atoms.

0. 3.++ mol l atoms



2. Calculate the number of

moles of @2 molecules in +.+ /142' @2 molecules.

0. 3.++ mol @2 molecules



2. Calculate the number of

molecules in "4 g 7@".

. 1.4- / 142' molecules



23. In a +.446g sample of carbon,

ho% many of the atoms have amass of 12.41 amu?

. 7one



"4. Calculate the empirical

formula of Bhypo, used inphotographic development,consisting of 23.1> 7a, '4.+>

D, and "4.'> A.). 7a2D2A"



"1. Calculate the molecular

formula of a compound %ithmolar mass 14' gEmolcomposed of 32."> carbon and

.> hydrogen.

. C1@1



"2. he reaction 7a2A F @2A

27aA@ illustrates a

. Dynthesis eaction



"". he reaction 0a<A@=2 F

2CuC7D 0a<C7D=2 F 2CuA@is an e/ample of

0. !etathesis eaction



"'. he decomposition of a

given compound can be carriedout

). either by passing electriccurrent or heating



"+. Calculate the molarity of a

2+46mH solution containing4.4 mmol of solute.

0. 4."24 !



"-. Calculate the number of

moles of solute re8uired toma$e +4.44 mH of 1.+44 !solution

C. 4.4+ mol



". Calculate the molarity of a

solution after 1.4 H of 2.4- !solution is diluted to 2.+4 H.

). 1.'4 !



". 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+"-



"3. Calculate the molality of an

alcohol in a8ueous solution ifthe mole fraction of the alcoholis 4.1+4.

C. 3.4 m alcohol



'4. 0attery acid is the common

name for

). sulfuric acid



'1. When one element causes

the o/idation of anotherelement, it is

C. reduced



'2. ccording to the 0ronsted

heory, an acid is

. a proton donor



'". he p@ of an acid solution is

. "



''. he p@ of a solution %ith a

hydrogen ion concentration of1 / 14" is

. F"



'+. he p@ concentration of a

solution that has a hydro/ideion concentration of 1 / 146' molEH is

C. 14



'-. 146- ! @Cl solution is

diluted to 144 times. he p@ ofthe diluted solution %ould be

. bet%een - to



'. substance %hich can act

both an acid and a base is&

0. amphoteric

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Chemistry Oct2011

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