
teste primeiro ano
Chemistry
1st Grade
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8 questions
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1.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Um recipiente contém 36 g de água (H2O). Sabendo que a massa molar da água é 18 g/mol, quantos mols de água estão presentes?
0,5 mol
1 mol
2 mol
3 mol
2.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Qual é a massa molar do dióxido de carbono (CO2)? Considere as massas atômicas: C=12 u e O=16 u.
28 g/mol
48 g/mol
32 g/mol
44 g/mol
3.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Qual é a massa de 0,5 mol de gás oxigênio (O2)? Considere O=16 u.
8
16
32
64
4.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Sabendo que 1 mol contém 6,022×1023 moléculas, quantas moléculas existem em 2 mols de dióxido de carbono (CO2)?
6,022×1023
2,408×1024
3,011×1023
1,204×1024
5.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Uma amostra de 80 g de gás metano (CH4) contém quantos mols? Considere as massas atômicas: C=12 u e H=1 u.
5
3
4
2
6.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Um estudante preparou uma solução dissolvendo 10 g de cloreto de sódio (NaCl) em água até completar 500 mL de solução. Qual é a concentração comum dessa solução?
20
15
10
5
7.
MULTIPLE CHOICE QUESTION
15 mins • 1 pt
Qual a massa de soluto necessária para preparar 2 L de uma solução de concentração 50 g/L?
50g
75g
100g
200g
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