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Răspândirea metalelor în natură

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Moldova

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Răspândirea metalelor în natură
 

Răspândirea metalelor în naturăOnline version

Citește atent întrebările

by Serghei Birdu
1

Metalele nobile se numesc minereuri

2

Cel mai răspândit metal în natură este fierul

3

Zincul în compuși manifestă gradul de oxidare negativ

4

Minereurile industriale de cupru reprezintă circa 60-70%

5

Sudarea șinelor căilor ferate se realizează prin metoda aluminotermie

6

Doar metalele nobile se întâlnesc în stare liberă sau chiar sub formă de metal nativ

7

Una din cea mai rentabilă metodă de obținere a metalelor este reducerea oxizilor metalici cu cărbunele sau oxidul de carbon II

8

Metalele tipice sunt situate la începutul fiecărei perioade

9

Majoritatea metalelor sunt active datorită că se găsesc în natură sub formă de compuși

10

Obținerea metalelor se face prin reducerea oxizilor acizi cu hidrogenul

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