Massa e Tamanho dos Átomos
Quiz
•
Chemistry
•
10th Grade
•
Medium
Ana Duarte
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10 questions
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1.
MULTIPLE CHOICE QUESTION
5 mins • 10 pts
- 9 m
10 - 9 m
10 - 8 m
- 8 m
2.
MULTIPLE CHOICE QUESTION
30 sec • 10 pts
Como se chama a técnica de manipulação da matéria à escala atómica e molecular que permite obter nanotubos de carbono?
Espetroscopia
Microscopia
Microtecnologia
Nanotecnologia
3.
FILL IN THE BLANK QUESTION
2 mins • 1 pt
A massa de um átomo de carbono é 1,9944 x 10- 23 g e a de um átomo de oxigénio é 2,6567 x 10-23 g. A razão entre a massa atómica do oxigénio e a massa atómica do carbono é
4.
MULTIPLE CHOICE QUESTION
5 mins • 10 pts
Numa balança analítica foi medida a massa de uma amostra de nanotubos de carbono, representada pela figura seguinte ao lado. Qual a opção que apresenta o resultado da medição e a incerteza de leitura, com os devidos algarismos significativos?
5.
MULTIPLE CHOICE QUESTION
5 mins • 10 pts
Uma amostra pura de 100 g de N2 contém, no total, cerca de
2,15 × 1024 átomos.
3,37 × 1023 átomos.
4,30 × 1024 átomos.
1,69 × 1023 átomos.
6.
MULTIPLE CHOICE QUESTION
5 mins • 10 pts
Quantos átomos de hidrogénio existem em 5,0 moles de moléculas de ácido acético, CH3COOH?
2,4 × 1025
3,0 × 1024
2,4 × 1024
7.
MULTIPLE CHOICE QUESTION
5 mins • 10 pts
Num reator foi introduzida uma mistura gasosa inicialmente constituída por 0,300 mol de CO (g) e por 0,300 mol de H2O (g). Qual é a quantidade total de átomos existentes na mistura gasosa?
1,50 mol
1,20 mol
0,900 mol
0,600 mol
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