Quantidade química
Authored by Ana Freitas
Chemistry
10th Grade
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3 questions
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1.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Uma amostra pura de 100,0 g de N2 (g) conterá, no total, cerca de
2.15 x 1024 átomos.
4.30 x 1024 átomos.
3.37 x 1023 átomos.
1.69 x 1023 átomos.
2.
MULTIPLE CHOICE QUESTION
3 mins • 1 pt
Considere um fio de ouro, Au, e outro de prata, Ag.
O fio de ouro contém 22,6 g desse metal e o fio de prata contém 50,0 g de prata.
Dados: Ar(Au) = 197,00; Ar(Ag) = 107,87.
Selecione a opção que completa, de forma correta, a seguinte frase.
O número de átomos de ouro é …
quatro vezes superior ao número de átomos de prata.
metade do número de átomos de prata.
igual ao número de átomos de prata.
um quarto do número de átomos de prata.
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Selecione a opção que completa corretamente a frase seguinte.
«Uma mesma quantidade de matéria de CO2 e O3 possui … »
… a mesma massa
… o mesmo número de átomos.
… diferente número de moléculas.
… o mesmo número de átomos de oxigénio.
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