nemetale si metale cls a 8a
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  • Question 1
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    Q.

    Simbolul chimic al carbonului este

    answer choices

    Ca

    Cb

    C

    Cu

  • Question 2
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    Q.

    In natura carbonul se gaseste sub forma de

    answer choices

    diamant

    grafit

    grafen

    fulerene

  • Question 3
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    Q.

    Fenomenul prin care grafitul lasa urme pe hartie se numeste:

    answer choices

    scriere

    desenare

    clivaj

    creionare

  • Question 4
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    Q.

    Cel mai raspandit element de pe planeta noastra este

    answer choices

    oxigen

    carbon

    azot

    siliciu

  • Question 5
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    Q.

    Este prorietate fizica comuna pentru oxigen si hidrogen:

    answer choices

    culoare

    miros

    densitate

    stare de agregare

  • Question 6
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    Q.

    Arderea completa a carbonului duce la:

    answer choices

    CO

    CaCO2

    CO2

    H2O

  • Question 7
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    Q.

    Gazul de apa se formeaza in urma reactiei dintre H2O si

    answer choices

    Cl

    O2

    C

    HCl

  • Question 8
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    Q.

    Formeaza molecule diatomice:

    answer choices

    azot, clor, oxigen

    carbon, fluor, oxigen

    azot, hidrogen, neon

    azot, carbon, oxigen

  • Question 9
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    Q.

    Coeficientii reactiei Al + O2 = Al2O3 sunt:

    answer choices

    2, 3, 1

    4, 3, 2

    2, 1, 3

    3, 2, 4

  • Question 10
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    Q.

    In urma respiratiei si arderii combustibililor se formeaza:

    answer choices

    CO2

    energie

    H2O

    O2

  • Question 11
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    Q.

    Hidrogenul a fost denumit de catre

    answer choices

    Henry Cavendish

    Joseph Priestley

    Antoine Lavoisier

  • Question 12
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    Q.

    Reactia dintre hidrogen si azot duce la formare de:

    answer choices

    metan

    amoniac

    apa

  • Question 13
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    Q.

    Formula oxidului de cupru (II) este

    answer choices

    CuO

    CuO2

    CuO3

  • Question 14
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    Q.

    Cuprul nu reactioneaza cu:

    answer choices

    H2O

    H2SO4dil

    H2SO4conc

    HNO3dil

  • Question 15
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    Q.

    Culoarea aluminiului este:

    answer choices

    alb-cenusiu

    rosu-aramiu

    alb-argintiu

  • Question 16
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    Q.

    Formula chimica a oxidului fero-feric este

    answer choices

    FeO

    Fe2O3

    Fe3O4

    Fe3O2

  • Question 17
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    Q.

    In urma reactiei Fe + Cl2 se formeaza

    answer choices

    FeCl2

    FeCl3

    FeCl

  • Question 18
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    Q.

    Se dau urmatoarele metale: Ca, Sn, Pb, Al, H. Ordinea cresterii reactivitatii este:

    answer choices

    Ca, Pb, Sn, H, Al.

    Ca, Al, Sn, Pb, H.

    Sn, Pb, H, Al, Ca.

    H, Pb, Sn, Al, Ca.

  • Question 19
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    Q.

    Masa de amoniac în g, care se obține din reactia a 0,06 kmoli de azot și hidrogen este:

    AN= 14, AH=1.

    answer choices

    15 g

    2040 g

    204 g

    154 g

  • Question 20
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    Q.

    Care metal in reactiei cu acidul azotic concentrat duce la degajare de hidrogen:

    answer choices

    Mg

    Al

    Cu

    Fe

  • Question 21
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    Q.

    Masa de oxid de magneziu ce se formeaza prin reactia a 24 g magneziu cu oxigen:

    answer choices

    34 g

    40 g

    20 g

    22 g

  • Question 22
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    Q.

    Hidrogenul peste substituit din H2O și HX de catre

    answer choices

    metale mai putin reactive decat el

    metale mai reactive decat el

  • Question 23
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    Q.

    Metalul cu cea mai buna conductibilitate electrica este:

    answer choices

    aluminiul

    argintul

    cuprul

    aurul

  • Question 24
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    Q.

    In urma reactiei dintre FeSO4 si NaOH se formeaza un precipitat de culoare:

    answer choices

    alb

    albastru

    alb-verzui

    negru

  • Question 25
    60 seconds
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    Q.

    Fierul este un metal

    answer choices

    monovalent

    divalent

    trivalent

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