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Considerando-se o equilíbrio químico
NH+4(aq) + H2O(l) ⇄ H3O +(aq) + NH3(aq),
em que a constante de equilíbrio é igual a 5,6 × 10-10, é correto afirmar que o valor mais próximo para o pH de uma solução 0,15 mol/L de NH4Cl(aq) é
O nitreto de silício (Si3N4), que é um composto cerâmico que combina diferentes propriedades, como alta resistência mecânica, moderada condutividade térmica e baixo coeficiente de dilatação térmica, tem sido empregado na fabricação de turbinas a gás, peças de motores automotivos e rolamentos e ferramentas de corte de metais. Industrialmente, o composto pode ser preparado por redução carbotérmica em atmosfera de nitrogênio, de acordo com a equação química a seguir.
3SiO2(s) + 6C(s) + 2N2(g) → Si3N4(s) + 6CO(g)
Com base nesse processo, a máxima massa em Kg de nitreto de
silício formada, em quilogramas, quando são colocados para reagir
360,0 kg de SiO2(s), 160,0 kg de C(s) e 140,0 kg de N2(g)
corresponde a
Objetivando estudar a Lei Ponderal de Lavoisier, um estudante realizou o experimento esquematizado a seguir, em que o líquido do frasco A corresponde a uma solução aquosa de ácido sulfúrico (H2SO4) e o sólido contido no frasco B representa uma amostra de carbonato de sódio (Na2CO3).
Ao final do processo o estudante notou, pela leitura no visor da
balança, que a massa resultante era diferente da massa inicial. No
contexto do experimento, essa situação foi verificada porque
There is no one answer to the question of how to teach writing in English Foreign Language classes. There are as many answers as there are teachers and teaching styles, or learners and learning styles. Writing means writing a connected text and the process of writing is a valuable tool for all of our students.
Ann Raimes. Techniques in teaching writing.
Oxford: Oxford University Press, 1993, p.6.
Choose the correct option concerning the process approach to the teaching of writing
It is a myth that all it takes to write is to sit down in front of a blank page, to begin at the beginning and write through to the end, with no planning, break, editing, or changes in between. And yet, this is sometimes what we ask our students to do. Good writers plan and revise, rearrange and delete text, re-reading and producing multiple drafts before they come up with their finished document. This is what a process writing approach is about.
Internet:<www.teachingenglish.org.uk>(adapted).
Based on the text, it can be concluded that
My heart laps up when I behold
A rainbow in the sky:
So was it when my life began;
So it is now I am a man;
So be it when I shall grow old,
Or let me die!
The child is Father of the Man;
And I could wish my days to be
Bound each to each by natural piety
Wordsworth. My Heart Leaps Up. In: Harold Bloom. How to Read and Why. New York: Touchstone, 2001. p.123
Based on Wordsworth’s poem above, choose the option that best describes what the poem is about.
The United States is one of the most diverse nations in the world. Its dynamic population of about 300 million boasts more than 30 million foreign-born individuals who speak numerous languages and dialects. Some one million new immigrants arrive each year, many from Asia and Latin America.
Literature in the U.S today is likewise dazzlingly diverse, exciting, and evolving. New voices have arisen from many quarters, challenging old ideas and adapting literary traditions to suit changing conditions of the national life. Social and economic advances have enabled previously underrepresented groups to express themselves more fully.
It is clear that American literature at the turn of the 21st century has become democratic and heterogeneous. Regionalism has flowered, and international, or “global”, writers refract U.S culture through foreign perspectives.
Kathryn Vanspanckeren. Outline of American Culture Revised edition. Published by the United States Department of State. 1994.
The United States is one of the most diverse nations in the world. Its dynamic population of about 300 million boasts more than 30 million foreign-born individuals who speak numerous languages and dialects. Some one million new immigrants arrive each year, many from Asia and Latin America.
Literature in the U.S today is likewise dazzlingly diverse, exciting, and evolving. New voices have arisen from many quarters, challenging old ideas and adapting literary traditions to suit changing conditions of the national life. Social and economic advances have enabled previously underrepresented groups to express themselves more fully.
It is clear that American literature at the turn of the 21st century has become democratic and heterogeneous. Regionalism has flowered, and international, or “global”, writers refract U.S culture through foreign perspectives.
Kathryn Vanspanckeren. Outline of American Culture Revised edition. Published by the United States Department of State. 1994.