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O oxigênio e o nitrogênio moleculares são exemplos de gases presentes em nossa atmosfera. O gás hidrogênio, por sua vez, é um poderoso combustível, que produz água no durante o processo de combustão. Sabendo-se que as ligações entre os átomos desses gases se dão por ligações do tipo covalente, represente suas fórmulas moleculares e as Estruturas de Lewis.​
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7. Complete the phrases using the simple past: a) Adam _______ (work) for 12 hour last weekendB)______ you______ (take) my cellphone again? C) My best friend _____ (note Go) to my birthday party. I'm Very sadD) _______she ______(do) her homework from last class?E) Samuel and Anna______ (be) my neighbors for almost 20 years.F)I ______(talk) to her yesterday,she _____(not be)at home.G)where ______ they _____(Go) during their last vacation?H)She ________(buy)the groceries yesterday. Today I don't need to Go the supermarket​
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7. Complete the phrases using the simple past: a) Adam _______ (work) for 12 hour last weekend B)______ you______ (take) my cellphone again? C) My best friend _____ (note Go) to my birthday party. I'm Very sad D) _______she ______(do) her homework from last class? E) Samuel and Anna______ (be) my neighbors for almost 20 years. F)I ______(talk) to her yesterday,she _____(not be)at home. G)where ______ they _____(Go) during their last vacation? H)She ________(buy)the groceries yesterday. Today I don't need to Go the supermarket​
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