MATÉRIA (004) – SUBSTÂNCIAS E MISTURAS
Autor: Professor Thiago Rennó | Publicado: 2013-07-17T10:47:00-07:00

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A matéria presente no universo pode
ser encontrada de duas maneiras:
- como substância pura;
- como mistura.
Chamamos substância pura toda matéria
formada por um tipo único de partícula. Já as misturas possuem dois ou mais
tipos de partículas.
Como substâncias puras, podemos citar
os gases oxigênio, nitrogênio e hidrogênio.
Já como misturas, os exemplos mais comuns
que temos são:
- o ar atmosférico – formado por vapor
d’agua, oxigênio, nitrogênio, dióxido de carbono e outros gases;

- a água que bebemos – formada pela
água (substância pura), cloro, flúor e outras substâncias.























Tipos
de Misturas




As misturas podem ser classificadas de
acordo com a distinção visual de seus componentes.
Desta maneira temos:
- misturas homogêneas – sem
possibilidade de identificação visual de seus componentes;
- misturas heterogêneas – permitem a
identificação visual de seus componentes.
Há ainda um tipo especial de mistura
conhecido como coloide - classificado como heterogênea, porém com visualização
de seus componentes apenas possível pelo uso de técnicas de microscopia óptica.

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