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Prueba Quimica

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Actividad Albedo

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Albedo ...
Albedo ...
Spain

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Actividad Albedo

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1

Un átomo con número atómico 12 tiene:

2

Si un átomo tiene 17 protones y 18 neutrones, su número másico es:

3

¿Cuál es la configuración correcta del sodio (Z=11)?

4

El compuesto NaCl presenta:

5

¿Cuál de las siguientes es una sustancia pura?

6

¿Cuál es la ecuación correctamente ajustada?

7

Quemar papel es un cambio:

8

El oxígeno pertenece al grupo:

9

¿Cuál es la masa molar aproximada del H₂O? (H=1, O=16)

10

¿Qué partícula determina principalmente las propiedades químicas de un elemento?

Explicación

El número atómico indica protones. En un átomo neutro, protones = electrones.

Número másico = protones + neutrones → 17 + 18 = 35.

El sodio tiene 11 electrones, se distribuyen en niveles hasta completar: 1s² 2s² 2p⁶ 3s¹.

NaCl es metal + no metal → transferencia de electrones → enlace iónico.

El agua destilada es una sola sustancia pura, sin mezclas.

Para ajustar: igualar átomos en ambos lados → 2H₂ + O₂ → 2H₂O.

La combustión transforma la celulosa del papel y el oxígeno del aire en sustancias nuevas, principalmente cenizas, dióxido de carbono y vapor de agua, liberando calor y luz.

El oxígeno no es metal → pertenece a los no metales.

Masa molar H₂O = (2×1) + 16 = 18 g/mol.

Los electrones (especialmente los de valencia) determinan cómo reacciona un elemento.

 
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