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1 AULA

APRESENTAO

Prezado (a) cursista,

Apresentamos, nesta aula, como acontecem as misturas, os dois tipos de

misturas e dicas para trabalhar o ensino sobre misturas. Para tanto, os

textos disponibilizados estaro em lngua inglesa para sejam aplicadas as

estratgias de leitura vistas durante as aulas presenciais.

Compreender esses assuntos facilitar o contato dos textos das aulas

seguintes, que tero perspectivas mais prticas.

Lets start the class?

OBJETIVOS

Aplicar as estratgias de leitura vistas nas aulas presenciais para

compreender os textos em lngua inglesa sobre misturas;

Adquirir conhecimentos bsicos sobre misturas e separao de

misturas para facilitar a compreenso dos textos sobre um

experimento a ser vistos em aulas posteriores;

Adquirir a habilidade de compreender textos tcnicos em lngua

inglesa que versem sobre misturas.

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TPICO 01: CHEMISTRY EXPERIMENTS: MIXTURES

Overview

Mixtures occur when several different elements or compounds are

placed in the same container without undergoing chemical reaction. There

are two main types of mixtures: Homogeneous mixtures occur when the

composition of the mixture is uniform and heterogeneous mixtures

occur when it is not. In this chapter, students will devise a way to separate

a heterogeneous mixture of salt, black pepper, and sand using theequipment available to them.

Teaching About Mixtures

Students usually have an intuitive idea of what a mixture is before

they come into a chemistry class. After all, many everyday processes

involve mixing things together. An excellent way to tap into this prior

knowledge is to have your students generate all of the examples of

mixtures you describe in your lectures.

For example, when you talk about a heterogeneous mixture, have

them come up with an example from their lives. For homogeneous

mixtures, this is a little more difficult, as students tend to give examples of

chemical compounds (salt, water) rather than examples of mixtures. Whenthis happens, refer back to the definition of a compound and explain that

compounds differ from mixtures in that theres only one kind of molecule

present in a compound.

Students frequently find themselves stumped by the task of

separating a mixture. They know how to make mixtures, but quickly realize

that separating mixtures back into their component parts is a much harder

proposition. Emphasize to them that this difficulty is natural. After all,

putting all of your dirty laundry into big piles in the corner of your bedroom

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is easy, but separating it into whites, colors, and delicates takes more time

and effort.

Students realize very quickly that its easy to identify and pull apart

the components of a heterogeneous mixture. Homogeneous mixtures are

another story: If everything in the mixture looks the same, how can you

pull them apart? How can you even tell that theres a mixture in the first

place? To explain how this is done, tell your students that theyll be

learning more advanced separation techniques later in the year.