Os materiais-revisões - CFQ - 7.º ano.pdf

7/28/2019 Os materiais-revises - CFQ - 7. ano.pdf

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Cincias Fsico-qumicasOs Materiais - revises7. ano

Nome:____________________________________________________________Data: __________

1. O que a Qumica?R:______________________________________________________________________________

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2. Considera as seguintes situaes e diz em que medida cada uma delas mostra a influncia daQumica no nosso quotidiano.

2.1. Para tomar banho acendemos o esquentador.R:___________________________________________________________________________

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2.2. Guardamos os alimentos em caixas de plstico.R:___________________________________________________________________________

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2.3. Para diagnosticar determinadas doenas fazemos anlises ao sangue.R:___________________________________________________________________________

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3. A qumica tem contribudo para o desenvolvimento de outras cincias. D exemplos quedemonstrem a relao da Qumica com a:

3.1. Medicina.R:___________________________________________________________________________

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3.2. Agronomia.R:___________________________________________________________________________

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3.3. Veterinria.R:___________________________________________________________________________

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3.4. Ecologia.R:___________________________________________________________________________

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4. Classifica os seguintes materiais, em materiais naturais ou materiais manufacturados:4.1. Plstico.__________________________________________4.2. Ferro. ___________________________________________4.3. Granito. __________________________________________4.4. Vidro. ___________________________________________4.5. Gasolina. _________________________________________4.6. Cobre. ___________________________________________4.7. Perfume. _________________________________________4.8. Petrleo bruto. ____________________________________4.9. Papel. ___________________________________________


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5. Identifica o seguinte material de laboratrio.

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6. Indica o significado dos seguintes sinais de perigo:

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7. Para garantir a segurana de todos os que trabalham num laboratrio, devem ser respeitadasalgumas regras. Das seguintes regras indica as que so verdadeiras (V) ou as falsas (F). Corrige

as falsas.

7.1. O tubo de ensaio deve ser aquecido na vertical.____7.2. Se um frasco no tiver rtulo deve-se cheirar para identificar a substncia. ____7.3. No se devem colocar recipientes quentes directamente em cima da bancada fria. ____7.4. Para diluir um cido deve-se deitar primeiro a gua sobre o cido. ____7.5. Todos os frascos devem dispor de rtulos em bom estado de conservao. ____

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8. Considera os seguintes materiais e classifica-os em substncias puras e misturas:8.1. Bolo.R:___________________________________________________________________________

8.2. lcool.R:___________________________________________________________________________

8.3. Natas.R:___________________________________________________________________________


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9. L, com ateno, o seguinte texto:A gua da fonte foi considerada bacteriologicamente pura. Aps anlise verificou-se que contm

cloreto de sdio, slica e outros sais.

9.1. O que te permite afirmar que a gua da fonte uma mistura?R:___________________________________________________________________________

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9.2. Qual o significado da palavra pura no texto?R:___________________________________________________________________________

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10.Classifica as seguintes misturas como homogneas, heterogneas e disperses coloiais:10.1.Sopa.R:___________________________________________________________________________

10.2.Leite.

R:___________________________________________________________________________

10.3.Coca-Cola.R:___________________________________________________________________________

10.4.Liga metlica.R:___________________________________________________________________________


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11.Sabendo que a densidade do ouro 19,3 g/cm3, calcula o volume de uma pea macia destemetal com 580 g de massa.

R:______________________________________________________________________________

12.Foram analisadas cinco amostras de 10 cm3

de substncias diferentes obtendo-se os seguintesvalores de densidade:

Amostra Densidade (g/cm3)

A 2,0

B 1,3

C 9,2

D 1,0

E 0,4

12.1.Calcula a massa de cada uma das amostras.


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12.2.Indica qual das amostras de gua pura. Justifica a tua resposta.R:___________________________________________________________________________

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12.3.Qual ou quais das substncias podero flutuar na gua? Justifica a tua resposta.R:___________________________________________________________________________

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12.4.Calcula o volume de 260g da substncia B.

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13.Desde a Antiguidade que o Homem utiliza as tcnicas de separao para obteno desubstncias, como por exemplo o sal.

13.1.Descreve o processo de obteno de sal nas salinas.R:___________________________________________________________________________

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13.2.Como se denomina o processo usado nas salinas?R:___________________________________________________________________________

14.Em que consiste uma destilao?

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15.Considera uma mistura de gua, lcool, areia, sal, ter.15.1.Seria possvel separar esta mistura usando apenas destilao? Justifica.R:___________________________________________________________________________

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15.2.Explica como deverias proceder para separar os constituintes desta mistura recuperandotodos no final.

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16.Como se designam as seguintes mudanas de estado:16.1.Do estado lquido para o estado gasoso.

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16.2.Do estado slido para o estado lquido.R:___________________________________________________________________________

16.3.Do estado slido para o estado gasoso sem passar pelo estado lquido.R:___________________________________________________________________________

16.4.Do estado lquido para o estado slido.R:___________________________________________________________________________

16.5.Do estado gasoso para o estado lquido.R:___________________________________________________________________________

17.A gua no estado lquido pode ser decomposta, por aco da corrente elctrica, em hidrognio eoxignio.

17.1.Como se designa esta transformao?R:___________________________________________________________________________

17.2.Como podes verificar experimentalmente a formao do hidrognio?

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17.3.Esquematiza, por meio de palavras, esta transformao.R:___________________________________________________________________________

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Bom trabalho!

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Os materiais-revisões - CFQ - 7.º ano.pdf