
Varul stins
Authored by Vasii Daria
Chemistry
9th Grade

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5 questions
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1.
FILL IN THE BLANK QUESTION
45 sec • 2 pts
Care este formula chimică a varul stins?
2.
MULTIPLE CHOICE QUESTION
45 sec • 2 pts
Cum se obține varul stins?
Varul nestins reactioneaza cu amoniacul
Varul stins reactioneaza cu apa
Varul nestins reactioneaza cu dioxidul de carbon
Varul nestins reactioneaza cu apa
3.
MULTIPLE SELECT QUESTION
45 sec • 2 pts
Care sunt proprietățile varului stins?
slab solubil in apă
reacționează cu baze și formează săruri
reacționează cu acizi și formează săruri
4.
MULTIPLE SELECT QUESTION
45 sec • 2 pts
Care sunt utilizările varului stins?
scăderea pH-ului apei
creșterea pH-ului apei
este folosit în industria hârtiei pentru tratarea lemnului , astfel încât transformarea lemnului în celuloză să fie mai ușoară
Vopsirea mașinilor
5.
MULTIPLE CHOICE QUESTION
45 sec • 2 pts
Soluțiile apoase de ........se numesc apă de var și sunt baze de rezistență medie , care reacționează cu ..... și pot ataca unele metale (cum ar fi aluminiul) protejând în același timp alte metale(cum ar fi fierul și oțelul).
hidroxid de calciu,. acizii
hidroxid de calciu,
bazele
oxid de calciu ,
acizii
oxid de calciu,
bazele
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