Archives for: abril 2, 2014

CURIOSIDADES: SAIBA MAIS SOBRE JÓIAS

 

 

220324-343365-ouro_colorido

 

 - Ouro

É um metal de transição brilhante, amarelo, pesado, maleável, dúctil (trivalente e univalente) que não reage com a maioria dos produtos químicos, mas é sensível ao cloro e ao bromo. À temperatura ambiente, apresenta-se no estado sólido. Este metal encontra-se normalmente em estado puro e em forma de pepitas e depósitos aluvionais e é um dos metais tradicionalmente usados para cunhar moeda. É tão dúctil e maleável que, com apenas um grama de ouro, é possível obter um fio de 3 quilômetros de extensão e 0,005 milímetros de diâmetro, ou uma lâmina quadrada de 70 centímetros de largura e espessura de 0,1 micrômetro.[1]
O ouro puro é demasiadamente mole para ser usado. Por essa razão, geralmente é endurecido formando liga metálica com prata e cobre. O ouro e as suas diversas ligas metálicas são muito empregados em joalherias, fabricação de moedas e como padrão monetário em muitos países. É considerado como um dos metais mais preciosos, tendo o seu valor sido empregue como padrão para muitas moedas ao longo da história.

Sua cor varia conforme a proporção da liga prata/cobre, e de acordo com o metal utilizado para endurecer a liga. Veja:

 

Ouro + 2/3 de prata + 1/3 de cobre Ouro Amarelo
Ouro + 1/3 de prata + 2/3 de cobre Ouro Rosa
Ouro + prata + zinco Ouro Azul
Ouro + prata + ferro (ou aço) Ouro Negro
Ouro + cobre Ouro Vermelho
Ouro + paládio Ouro Branco
Ouro + prata Ouro Verde

 

       - Ouro É um metal de transição brilhante, amarelo, pesado, maleável, dúctil (trivalente e univalen...

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Watch Full Movie Explosion (Yin Bao Zhe) (2017)

Explosion (Yin Bao Zhe) (2017)

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Director : Chang Zheng.
Cast : Duan Yihong, Nan Yu, Wang Jingchun, Cheng Tai-Shen.
Genre : Mystery, Thriller, Action.
Duration : 1 hours 47 minutes
Synopsis :
Movie ‘Explosion (Yin Bao Zhe)’ was released in November 24, 2017 in genre Mystery. Chang Zheng was directed this movie and starring by Duan Yihong. This movie tell story about A blast technician (Duan Yihong) in a mining town survives an explosion only to discover it may not have been an accident. While investigating the truth, he becomes the prime suspect and must use his unique skillset to clear his name.
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Explosion (Yin Bao Zhe) (2017) Released November, 11 2017 0 Director : Chang Zheng. Cast : Duan Yihong, Nan Yu, Wang Jin...

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Watch and Download Full Movie Big Sonia (2017)

Big Sonia (2017)

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Download and Watch Movie Big Sonia (2017)
Director : Leah Warshawski, Todd Soliday.
Cast : -
Genre : Documentary.
Duration : 1 hours 33 minutes
Synopsis :
Movie ‘Big Sonia’ was released in November 17, 2017 in genre Documentary. Leah Warshawski was directed this movie . This movie tell story about In the last store in a defunct shopping mall, 91-year-old Sonia Warshawski – great-grandmother, businesswoman, and Holocaust survivor – runs the tailor shop she’s owned for more than 30 years. But when she’s served an eviction notice, the specter of retirement prompts Sonia to resist her harrowing past as a refugee and witness to genocide.
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Big Sonia (2017) Released November, 11 2017 0 Director : Leah Warshawski, Todd Soliday. Cast : - Genre : Documentary. Du...

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