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F
I 1 4 . , / . -
. .:;3F":j,. DrRr,cTrA GENERALAEDUCATTETTNERET$r spoRT
".?.":.'.i:" OLIMPIADADECHIMIE-::."..
..:"ff ETAPAMLrtIcIpALA- 0afebruarie2013
'f*t{" cLAsAArx-A-
'9'
I incercuili litera corespunzdtoarerdspunsuluicorecL
1) Cationulcustructuragazuluiinert argoneste:
lop
a. Cl; b.Na*; c. ua- ; d.s2.
c. clorul; d. azotul.
2) Gazulcu densitateain c,n.egali cu 1,25g/l este:
a. amoniacul; b. dioxiduldecarbon;
3) Din solutiaceconfinesulfatdefrer (II), sulfatdesodiuqisulfatdecupru (II) sedepunpeo barl de
magneziu:
a. Fe; b. Fe qiNa; c.FeqiCu; d.Cu.
4) NU sedepuneprecipitatla adiugareain solutiedehidroxid desodiuconcentratla substantei:
a.SnSO+; b.MgSOa; c. FeSOa; d. CuSOa.
d, rogu.
d. fierul.
5) Sirurile decalciu coloreazdflacira spirtierei in:
a. violet; b. albastru; c. verde;
6) Oxidul unui metal trivalent contine 68.42V.metal. Metalul este:
a. aluminiu; b. cromul; c. nichelul;
7) 29,4g acidsulfuricconfineacelaginumir deatomide hidrogenca:
a.5,1 g amoniac; b. 8,96I oxiddesulf(VI); c.3,2gmetan; d.6,72I sulfur[dehidrogen.
8) Celmai marevolumdeaerseconsumila ardereaa 100g de:
a' HrS; b. Al; c. C:HsOH; d. Fe.
9) Metalul care nu esteatras de magnet este:
a. zincul; b.cobaltul; c. fierul; d. nichelul.
d. BaH2.
10) Substanfain care hidrogenul are grad de oxidare negativ este:
a. PH:; b. CH:O; c.NII+CI;
il. Rezolvaliproblemela
Unul din gazelede luptd folosite in primul rf,zboi mondialesteun compusoxigenatal clorului. ObJinutprin 7p.
combinareaclodui cuun gazinodor. $tiind cdpentrusintezdseutilizeazaun amestecechimoleculardegazede
1,71orimaigreudecitaerul,determina{iformulagazuluidelupti.
17,22g de cristalohidratse dizolvi in apd,iar soluliaoblinutl se trateazdcu hidroxidde sodiuin exces.l4p.
Precipitatulformatestecalcinatoblinindu-seoxidmetalicin careparteademasia metaluluiestede 1,5ori mai
maredecita oxigenului.La tratareacu soluliede cloruri de bariua uneiprobeidenticede cristalohidratse
formeazd16,31g precipitatalbinsolubilin acizi.Determinajiformulacristalohidratului.
O placddealiaj formatdinnichelgiun metaldivalentesteintrodusdin 300g solutiedeazotatdeargintcupartea
demasl de21,53%.Dupit substituireaintregii cantitelideargint,masapldcii a crescutcu 30,28g, iar parteade
masl a azotahrluide nichel(II) in soluliafinall estede 2,72%o.Considerindce arnbelemetaleparticipl la
scoatereaargintuluidin solutie,determinalimetalulnecunoscutdin aliaj.
Identificajisubstantelenotateculitereqiscrietiecuatiilereacliilor,dac6seqtiecesubstantaG esteungazinodor
del,l03 ori maigreudecdtaerul,iarsubstanlaDesteungazcoloratcudensitateain c.n.de0,00317g/cm'.
18p.1
2op.
1) KMrOa+A=B+C+D1 + lIrO
2) D+KOH=B+E+HzO
3) D+KOH
't
> B+F+Hro
a; p--.t9'Ja9z-+n+C1
Total- 69puncte
E
tt
>B+F
F
toc
) B+KCloa
G+H2S:llf+fl2Q
G+HzS=Il+HzO
6)
7)
8)
MULT SUCCES!
Timp delucru: 180minute

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2013

  • 1. F I 1 4 . , / . - . .:;3F":j,. DrRr,cTrA GENERALAEDUCATTETTNERET$r spoRT ".?.":.'.i:" OLIMPIADADECHIMIE-::.".. ..:"ff ETAPAMLrtIcIpALA- 0afebruarie2013 'f*t{" cLAsAArx-A- '9' I incercuili litera corespunzdtoarerdspunsuluicorecL 1) Cationulcustructuragazuluiinert argoneste: lop a. Cl; b.Na*; c. ua- ; d.s2. c. clorul; d. azotul. 2) Gazulcu densitateain c,n.egali cu 1,25g/l este: a. amoniacul; b. dioxiduldecarbon; 3) Din solutiaceconfinesulfatdefrer (II), sulfatdesodiuqisulfatdecupru (II) sedepunpeo barl de magneziu: a. Fe; b. Fe qiNa; c.FeqiCu; d.Cu. 4) NU sedepuneprecipitatla adiugareain solutiedehidroxid desodiuconcentratla substantei: a.SnSO+; b.MgSOa; c. FeSOa; d. CuSOa. d, rogu. d. fierul. 5) Sirurile decalciu coloreazdflacira spirtierei in: a. violet; b. albastru; c. verde; 6) Oxidul unui metal trivalent contine 68.42V.metal. Metalul este: a. aluminiu; b. cromul; c. nichelul; 7) 29,4g acidsulfuricconfineacelaginumir deatomide hidrogenca: a.5,1 g amoniac; b. 8,96I oxiddesulf(VI); c.3,2gmetan; d.6,72I sulfur[dehidrogen. 8) Celmai marevolumdeaerseconsumila ardereaa 100g de: a' HrS; b. Al; c. C:HsOH; d. Fe. 9) Metalul care nu esteatras de magnet este: a. zincul; b.cobaltul; c. fierul; d. nichelul. d. BaH2. 10) Substanfain care hidrogenul are grad de oxidare negativ este: a. PH:; b. CH:O; c.NII+CI; il. Rezolvaliproblemela Unul din gazelede luptd folosite in primul rf,zboi mondialesteun compusoxigenatal clorului. ObJinutprin 7p. combinareaclodui cuun gazinodor. $tiind cdpentrusintezdseutilizeazaun amestecechimoleculardegazede 1,71orimaigreudecitaerul,determina{iformulagazuluidelupti. 17,22g de cristalohidratse dizolvi in apd,iar soluliaoblinutl se trateazdcu hidroxidde sodiuin exces.l4p. Precipitatulformatestecalcinatoblinindu-seoxidmetalicin careparteademasia metaluluiestede 1,5ori mai maredecita oxigenului.La tratareacu soluliede cloruri de bariua uneiprobeidenticede cristalohidratse formeazd16,31g precipitatalbinsolubilin acizi.Determinajiformulacristalohidratului. O placddealiaj formatdinnichelgiun metaldivalentesteintrodusdin 300g solutiedeazotatdeargintcupartea demasl de21,53%.Dupit substituireaintregii cantitelideargint,masapldcii a crescutcu 30,28g, iar parteade masl a azotahrluide nichel(II) in soluliafinall estede 2,72%o.Considerindce arnbelemetaleparticipl la scoatereaargintuluidin solutie,determinalimetalulnecunoscutdin aliaj. Identificajisubstantelenotateculitereqiscrietiecuatiilereacliilor,dac6seqtiecesubstantaG esteungazinodor del,l03 ori maigreudecdtaerul,iarsubstanlaDesteungazcoloratcudensitateain c.n.de0,00317g/cm'. 18p.1 2op. 1) KMrOa+A=B+C+D1 + lIrO 2) D+KOH=B+E+HzO 3) D+KOH 't > B+F+Hro a; p--.t9'Ja9z-+n+C1 Total- 69puncte E tt >B+F F toc ) B+KCloa G+H2S:llf+fl2Q G+HzS=Il+HzO 6) 7) 8) MULT SUCCES! Timp delucru: 180minute