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Concursos » Escola » Química » GasesGases Gases - conceito, origem, exemplos, benefícios e malefícios.
Os gases são partículas que atuam de forma afastada e com movimentos constantes e desordenados entre si. Eles podem sofrer a interferência de fatores externos, como pressão e temperatura, que alteram a sua movimentação e até mesmo seu estado.
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Diferente dos sólidos e líquidos, os gases estão em um determinado estado da matéria que não possui volume nem forma definida. Os gases possuem uma densidade muito inferior aos outros estados da matéria, uma vez que são espaços vazios entre suas moléculas. Isso gera uma maior liberdade dessas partículas, que podem se espalhar facilmente e rapidamente até que estejam igualmente distribuídas pelo espaço ou recipiente onde se encontram. Os gases são moléculas capazes de realizar translação, rotação e vibração.
Qual é a origem dos gases?
Os gases sempre existiram, desde a Terra primitiva, quando não havia nenhum tipo de vida aeróbica. Pelo fato da Terra ter vivido durante milhões de anos com intensas atividades vulcânicas e colisões causadas por meteoros, ela era inicialmente formada pelo gás metano, amônia, nitrito, vapor de água e o dióxido de carbono, uma composição química nada favorável para a existência dos seres humanos.
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Porém, com o ar dos anos, a Terra ou a ganhar novos “habitantes”, que foram organismos capazes de gerar oxigênio através da fotossíntese. Com isso, foi-se criando uma atmosfera totalmente rica em gás oxigênio. Mas os seres iniciais que começaram a produzir o gás oxigênio, que é imprescindível para a vida na terra, eram anaeróbicos. Foi desta forma que começou a ocorrer uma tremenda evolução terrestre, onde alguns conseguiram sobreviver com a nova composição atmosférica (e evoluíram) e outros foram extintos.
Com a evolução atmosférica e fatores como a interferência do homem na natureza, foi possível o surgimento de novos gases. Dentro da tabela periódica muitos gases foram descobertos (e ainda acredita-se que há gases desconhecidos) a partir de experimentos físico-químicos, o que permitiu o estudo e um maior conhecimento a respeito do assunto. Conhecimento esse que a pela compreensão sobre como se dá a formação (seja por ligações químicas ou não) de determinados gases.
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Exemplos de gases
Estes gases possuem dificuldade em realizar combinações químicas com outros átomos e isso faz com que ele tenha uma baixa reatividade. Os gases nobres são:
– Hélio
– Neônio
– Argônio
– Criptônio
– Xenônio
– Radônio
– Ununóctio
Como sabemos, existem diversos gases na natureza, eles podem ser inflamáveis ou não inflamáveis, corrosivos, inertes, tóxicos, oxidantes ou reativos. Veja alguns outros exemplos de gases a seguir.
– Dióxido de enxofre
– Dióxido de carbono
– Oxigênio
– Hidrogênio
– Azoto
– Ozônio
– Nitrogênio
– Propano
– Butano
– Acetileno
– Cloro
– Flúor
Benefícios e malefícios dos gases
Hoje, sabemos que já é possível a utilização de gases como uma forma de geração de energia limpa, na qual ocorre pouco ou nenhum impacto na natureza. Exemplo disso é o gás metano, que vem sendo utilizado cada vez mais como combustível automotivo, sendo menos poluente e muito mais barato que o álcool e, principalmente, a gasolina.
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Além disso, os gases possibilitam que a nossa vida se torne mais fácil. Exemplo disso é o amplo uso do botijão de gás, que nos permite ter o ao fogo de forma fácil e segura, para o preparo dos nossos alimentos.
Mas não poderíamos falar de benefícios dos gases sem lembrar dos gases responsáveis pela manutenção da vida na Terra: afinal de contas, a nossa respiração ocorre justamente pela possibilidade de troca gasosa que o nosso organismo pode realizar. Então sem os gases seria impossível a habitação humana na Terra.
Por outro lado, sabemos que alguns gases, como o dióxido de carbono, são os vilões da natureza. Acredita-se que este gás (juntamente com a emissão desordenada do metano), é o responsável pelo efeito estufa. Além da poluição do meio ambiente, é possível notar que ocorrem muitos problemas respiratórios nos habitantes das grandes cidades do mundo, em decorrência da emissão dos gases poluentes.
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