
PRUEBA PROYECTO CIENTIFICO SEGUNDO 2
Authored by Martha Cecilia Carrasco Melo
Chemistry
4th Grade
Used 6+ times

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20 questions
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1.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
¿Cuál es la cantidad de sustancia que posee un número de Avogadro?
a) Una Masa
b) Un Mili mol
c) Una Mol
d) Una uma
2.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
¿Cuántas moléculas hay en 9 g de agua? Masa molecular H2O= 18 g/mol
a) 6,022 x 10-12
b) 6,022 x 1012
c) 3,011 x 10-23
d) 3,011 x 1023
3.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
¿Cuál es la masa molecular del H2SO3? Ma H= 1 g/mol;
Ma S= 32 g/mol; Ma O= 16 g/mol
a) 48
b) 82
c) 98
d) ninguna
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Cuántos átomos de Calcio contienen 40.08 gramos de Calcio
a) 40.08 átomos
b) 622 X 1023 átomos
c) 6.022 X 1023 átomos
d) 20 átomos
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Calcula la fórmula empírica de un compuesto que en un análisis dio la siguiente composición: 32,4% de Na y 22,6 S% y 45.1 % de O (CUAL ES LA FORMULA EMPIRICA)
a) Na2SO3
b) Na SO4
c) Na2SO4
d) NINGUNA DE LAS ANTERIORES
6.
MULTIPLE CHOICE QUESTION
20 sec • 1 pt
El análisis de un compuesto dio la siguiente composición:
C: 37,8 % H: 6,3% Cl: 55,8%.La fórmula empírica del compuesto es:
a) C2H4Cl
b) C2H3Cl
c) CH4Cl
d) C2H4Cl2
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Determina la composición centesimal del hidróxido de calcio, Ca(OH)2
Masas atómicas (u): H=1; O=16; Ca=40
a) 65,7 % Ca
12,3 % O
22 % H
b) 59,8 % Ca
38,4 % O
1,8 % H
c) 66,5 % Ca
21,1 % O
d) 54,1 % Ca
43,2 % O
2,7 % H
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