Questões de Vestibulares de Química 2º Ano
Autor: Eliane Gonçalves | Publicado: 2012-12-16T05:05:00-08:00


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Questões de Vestibulares de Química 2º Ano - Soluções, estequiometria, gases

&nbsp;Questões de Química Geral



1)Uma característica essencial dos fertilizantes é sua
solubilidade em água. Por isso, a indústria de fertilizantes transforma o
fosfato de cálcio, cuja solubilidade em água é muito reduzida, num composto
muito mais solúvel, que é o superfosfato de cálcio. Representa-se esse processo
pela equação:


CaX(PO4)2&nbsp; +&nbsp; yH2SO4&nbsp; &nbsp; Ca(H2PO4)Z &nbsp;+ 2CaSO4

Onde os valores de X, Y e Z&nbsp; são respectivamente:

a)4, 2 e 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b)3, 6 e 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c)2, 2 e 2&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d)5, 2 e 3&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; e)3, 2 e 2

2)Em uma amostra de 4,3
g de hexano (C6H14) encontramos aproximadamente:
(Dados:MA do H=1; C=12)

a)6.1023 moléculas&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b)3.1022 moléculas&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c)3.1023 moléculas&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d)1,5.1023 moléculas&nbsp;&nbsp; e)1,5.1022 moléculas

3)Se um pneu é cheio
com uma mistura dos gases ideais H2, N2 e He nas CNTP, na
proporção de 1,5 mol de H2, 42 g de N2&nbsp; e 33,6 L de He, é INCORRETO afirmar que,no
pneu,

a) os gases H2,
N2 e He exercem a mesma pressão parcial

b) o número de mols de
cada um desses gases é o mesmo

c) os três gases ocupam
um volume idêntico

d) as massas de H2,
N2 e He são iguais

4)Uma das reações que
pode ocorrer entre Fe2O3 e CO é representada pela
equação:

Fe2O3
+ 3CO&nbsp; &nbsp; 2Fe + 3CO2

A massa de CO consumida
na obtenção de 37 g de Fe será aproximadamente igual a:

a)28 g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b)42 g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c)56 g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d)70 g&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; e)84 g

5)No preparo de uma
solução alvejante de tinturaria, 521,5 g de hipoclorito de sódio são
dissolvidos em água suficiente para 10 L de solução. A concentração em mol/L da
solução obtida é: (massa molar do NaCO =74,5 g/mol)

a)7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b)3,5&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c)0,7&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d)0,35&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; e)0,22

6)Para determinar o
teor de chumbo, como Pb2+ , na água de um rio, foi coletada uma
amostra de 2 L, a qual, antes de ser analisada, foi concentrada para 20 mL por
evaporação do solvente. O teor de chumbo encontrado na amostra concentrada foi
de 3.10-3 mol/L. Portanto, é correto afirmar que a concentração de
chumbo na água do rio é:

a)0,03 mol/L&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; b)3 mol/L&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; c)3.10-5 mol/L&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp; d)0,003 mol/L