Reactiile de ardere. Oxizi. | Chemistry - Quizizz

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Reactiile de ardere. Oxizi.

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8th grade

Chemistry

manuela_donici_66846

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Question 1
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Q.
C + O₂ = CO₂ + Q
Reactiile de ardere sunt din categoria reactiilor:
answer choices
de combinare
de substitutie
de schimb
de descompunere
<p>de combinare</p>
alternatives
<p>de substitutie</p>
<p>de schimb</p>
<p>de descompunere</p>
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Question 2
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Q.
Reactiile de ardere se mai numesc:
answer choices
reactii de combustie
reactii de neutralizare
reactii redox
reactii de schimb
<p>reactii de combustie</p>
alternatives
<p>reactii de neutralizare</p>
<p>reactii redox</p>
<p>reactii de schimb</p>
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Question 3
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Q.
La reactiile de ardere participa intotdeauna ca reactant substanta:
answer choices
oxigen molecular
azot molecular
dioxidul de carbon
carbonul
<p>oxigen molecular</p>
alternatives
<p>azot molecular</p>
<p>dioxidul de carbon</p>
<p>carbonul</p>
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Question 4
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Q.
Din exemplele date este o reactie de ardere:
answer choices
C + 2 H₂ = CH₄
Zn + Cl₂ = ZnCl₂
Fe + S = FeS + Q
C + O₂ = CO₂ + Q
<p>C + 2 H<sub>2</sub> = CH<sub>4</sub></p>
alternatives
<p>Zn + Cl<sub>2</sub> = ZnCl<sub>2</sub></p>
<p>Fe + S = FeS + Q</p>
<p>C + O<sub>2</sub> = CO<sub>2</sub> + Q</p>
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Question 5
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Q.
Reactia de ardere a hidrogenului este:
answer choices
H₂ + 1/2 O₂ = H₂O + Q
H₂ + S = H₂S
H₂ + Cl₂ = 2 HCl
H₂ + CuO = Cu + H₂O
<p>H<sub>2</sub> + 1/2 O<sub>2</sub> = H<sub>2</sub>O + Q</p>
alternatives
<p>H<sub>2</sub> + S = H<sub>2</sub>S</p>
<p>H<sub>2</sub> + Cl<sub>2</sub> = 2 HCl</p>
<p>H<sub>2</sub> + CuO = Cu + H<sub>2</sub>O</p>
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Question 6
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Reactiile de ardere au urmatoarele caracteristici:
answer choices
sunt endoterme (au loc cu absorbtie de caldura)
sunt exoterme (au loc cu absorbtie de caldura)
sunt exoterme (au loc cu degajare de caldura) si conduc la obtinerea de oxizi
sunt aterme ( nici nu se absoarbe, nici nu se degaja caldura)
<p>sunt endoterme (au loc cu absorbtie de caldura)</p>
alternatives
<p>sunt exoterme (au loc cu absorbtie de caldura)</p>
<p>sunt exoterme (au loc cu degajare de caldura) si conduc la obtinerea de oxizi</p>
<p>sunt aterme ( nici nu se absoarbe, nici nu se degaja caldura)</p>
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Question 7
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Q.
Oxizii sunt compusi binari ai metalelor (Fe, Cu, Na,...) sau nemetalelor (C, S, H,...) cu elementul:
answer choices
Cl
O
Zn
K
<p>Cl</p>
alternatives
<p>O</p>
<p>Zn</p>
<p>K</p>
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Question 8
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Q.
Exemple de oxizi sunt:
answer choices
CuS, FeSO₄, KOH
CO₂, H₂O, K₂O
HCl, H₂O, H₂SO₄
FeI₂, FeI₃, Fe₂O₃
<p>CuS, FeSO<sub>4</sub>, KOH</p>
alternatives
<p>CO<sub>2</sub>, H<sub>2</sub>O, K<sub>2</sub>O</p>
<p>HCl, H<sub>2</sub>O, H<sub>2</sub>SO<sub>4</sub></p>
<p>FeI<sub>2</sub>, FeI<sub>3</sub>, Fe<sub>2</sub>O<sub>3</sub></p>
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Question 9
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Q.
Utilizarile dioxidului de siliciu (nisip), SiO₂ sunt numeroase.
Dintre acestea cea mai cunoscuta este:
answer choices
in constructii la obtinerea mortarului, betonului,...
in alimentatie
in medicina
in panificatie
<p>in constructii la obtinerea mortarului, betonului,...</p>
alternatives
<p>in alimentatie</p>
<p>in medicina</p>
<p>in panificatie</p>
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Question 10
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Oxidul de aluminiu, Al₂O₃, se gaseste in natura sub diferite forme. Cea mai valoroasa forma este:
answer choices
rubin
bauxita
corindon
cuart
<p>rubin</p>
alternatives
<p>bauxita</p>
<p>corindon</p>
<p>cuart</p>
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Question 11
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Dioxidul de carbon, responsabil si el de incalzirea globala, are urmatoarea utilizare:
answer choices
stingerea incendiilor
obtinerea branzei
ajuta in respiratie
ajuta la arderea combustibililor
<p>stingerea incendiilor</p>
alternatives
<p>obtinerea branzei</p>
<p>ajuta in respiratie</p>
<p>ajuta la arderea combustibililor</p>
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Question 12
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Oxidul indispensabil vietii noastre pe aceasta planeta este:
answer choices
CO2 (dioxidul de carbon)
SiO₂ (nisipul)
H₂O (apa)
CO ( monoxidul de carbon)
<p>CO2 (dioxidul de carbon)</p>
alternatives
<p>SiO<sub>2</sub> (nisipul)</p>
<p>H<sub>2</sub>O (apa)</p>
<p>CO ( monoxidul de carbon)</p>
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