Add Papers Marked0
Paper checked off!

Marked works

Viewed0

Viewed works

Shopping Cart0
Paper added to shopping cart!

Shopping Cart

Register Now

internet library
Atlants.lv library
FAQ
0,99 € Add to cart
Add to Wish List
Want cheaper?
ID number:865490
 
Author:
Evaluation:
Published: 09.01.2007.
Language: Latvian
Level: Elementary school
Literature: n/a
References: Not used
Extract

Varš dabā un tā iegūšana. Cilvēce šo metālu pazīst jau 9000 gadu.
Pazīstamākie vara minerāli ir halkopirīts( CuFeS2) , vara spīde Cu2S , pusdārgakmens melahīts [Cu(OH)]2CO3 . Sastopami arī vara tīrradņi; smagākais no tiem – 420 tonnas – atrasts 1857. gadā ASV.
Varu galvenokārt iegūst no sulfīdrūdām, jo aptuveni 80% vara sastopami savienojumā ar sēru. Sulfīdrūdas koncentrē un pēc tam apdedzina ar skābekli bagātinātā gaisā:
2Cu2S + 3O2 tº 2Cu2O + 2SO2 ↑…

Author's comment
Load more similar papers

Atlants

Choose Authorization Method

Email & Password

Email & Password

Wrong e-mail adress or password!
Log In

Forgot your password?

Draugiem.pase
Facebook

Not registered yet?

Register and redeem free papers!

To receive free papers from Atlants.com it is necessary to register. It's quick and will only take a few seconds.

If you have already registered, simply to access the free content.

Cancel Register