(UPE) Observe atentamente a imagem a seguir:

Ela mostra um trecho da Tapeçaria de Bayeux (séc. XI d.C.), na qual o rei saxão Harold Godwinson jura fidelidade a Guilherme, o conquistador. Qual relação social, existente no medievo, está expressa nessa imagem?

O leite de vaca possui um pH médio de 6,6. Em caso de mastite, ou seja, inflamação da glândula mamária causada por bactérias, o pH torna-se alcalino. As bactérias acidificam o leite, mas o organismo do animal, para compensar, libera substâncias alcalinas.

Qual deve ser o valor do pH do leite de um animal com mastite?  

    You know the exit is somewhere along this stretch of highway, but you have never taken it before and do not want to miss it. As you carefully scan the side of the road for the exit sign, numerous distractions intrude on your visual field: billboards, a snazzy convertible, a cell phone buzzing on the dashboard. How does your brain focus on the task at hand?

    To answer this question, neuroscientists generally study the way the brain strengthens its response to what you are looking for – jolting itself with an especially large electrical pulse when you see it. Another mental trick may be just as important, according to a study published in April in the Journal of Neuroscience: the brain deliberately weakens its reaction to everything else so that the target seems more important in comparison.

    Such research may eventually help scientists understand what is happening in the brains of people with attention problems, such as attention deficit/hyperactivity disorder. And in a world increasingly permeated by distractions – a major contributor to traffic accidents – any insights into how the brain pays attention should get ours.

Scientific American, July 2014. Adaptado

(FUVEST 2015 1ª FASE) O foco principal do texto são as

(IFSUL) Uma das aplicações dos percloratos é o uso em foguetes de propulsão. O combustível sólido é preparado segundo a equação química abaixo:

São características dos não metais Cl, C e N: