caracterul metalic Flashcards

1
Q

ce este caracterul metalic?

A

reprezinta tendinta elementelor de a ceda electroni formand ioni pozitivi

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2
Q

prin ce este pusa in evidenta variatia caracterului metalic?

A

prin reactia metalelor cu O2 , H2O si prin intarirea hidroxizilor

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3
Q

Na+O2

A

Na2O2

Na- un metal reactiv care este tinut sub petrol in care se aprinde

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4
Q

Mg +O2

A

MgO

Mg-arde cu o flacara alba orbitoare,se obtine o pulbere alba care este MgO

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5
Q

Al+O2

A

Al2O3

Al reactioneaza cu oxigenul,dar sub forma de pulbere ,arde cu scantei mici si albe

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6
Q

Na+H2O

A

NaOH +H2

NaOH este o baza care in reactia cu fenoftaleina se face rosu carmin

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7
Q

Mg+H2O

A

Mg(OH)2 + H2

+fenoftaleina este roz care se intensifica la incalzire

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8
Q

Al+ H2O

A

Aluminiu nu reactioneaza cu H2O

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9
Q

AlCl3+NaOH

A

Al(OH)3+NaCl

caracter amfoter,alb gelatinos

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10
Q

ce sunt amfolitii

A

substante cu caracter amfoter care pot reactiona cu bazele si acizii (ex Al(OH)3)

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