Autor: Escola Quaresma | Publicado: 2012-10-23T19:16:00-02:00


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1)&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;
No cotidiano, a concentração é muito usada para indicar
a composição de alimentos, medicamentos e materiais de limpeza e higiene que
são líquidos. Observe o rótulo do leite integral abaixo, que analisa a
concentração de vários nutrientes como carboidratos, proteínas e gorduras
totais presentes em 200 mL da solução.


Por exemplo, em cada 200 ml do leite, tem-se 9 g de carboidratos. 


A) Calcule a concentração de carboidratos no leite:



2) Considere duas latas do mesmo
refrigerante,

uma versão “diet” e outra versão
comum. Ambas contêm o

mesmo volume de líquido (300 mL)
e têm a mesma massa

quando vazias. A composição do
refrigerante é a mesma em

ambas, exceto por uma diferença:
a versão comum, contém

certa quantidade de açúcar,
enquanto a versão “diet” não contém

açúcar (apenas massa desprezível
de um adoçante artificial).

Pesando-se duas latas fechadas do
refrigerante, foram obtidos os

seguintes resultados:



Por esses dados, pode-se concluir
que a concentração, em g/L,

de açúcar no refrigerante comum é
de, aproximadamente:

a) 0,020g/L. b) 0,050g/L. c)
1,1g/L.

d) 20g/L. e) 50g/L.

3) – Após o preparo de um suco de
fruta, verificou-se que 200

mL da solução obtida continha
58mg de aspartame. Qual a

concentração de aspartame no suco
preparado?



a) 0,29 g/L. b) 2,9 g/L. c) 0,029
g/L.

d) 290 g/L. e) 0,58 g/L.



4) – Evapora-se totalmente o
solvente de 250 mL de uma

solução aquosa de cloreto de
magnésio, 8,0g/L. Quantos gramas

de soluto são obtidos ?

a) 8,0 g. b) 6,0 g. c) 4,0 g. d)
2,0 g. e) 1,0 g.