Question

nube violeta.
c. el triyoduro de nitrógeno está com
elementos distintos.
d. el triyoduro de nitrógeno conserva
química.

1. ¿qué ecuación química representa la

descripta?
a. $ce{i_{2} + n_{2} + o_{2} -> 2ni_{3}}$
b. $ce{n_{2} + 3i_{2} -> 2ni_{3}}$
c. $ce{ni_{3} -> n_{2} + i_{2} + o_{2}}$
d. $ce{2ni_{3} -> n_{2} + 3i_{2}}$

1. ¿qué tipo de reacción se describe?

a. la descomposición
b. la síntesis
c. la sustitución simple
d. la sustitución doble

instrucciones: lee el pasaje y la pre
mejor respuesta.

Explanation:

Question 11

To determine the correct chemical equation, we analyze the reactants and products. Triiodide of nitrogen (NI₃) decomposition should produce nitrogen (N₂) and iodine (I₂). Let's check each option:

• Option A: Includes O₂, which is not part of NI₃, so incorrect.
• Option B: Represents synthesis (combination) of N₂ and I₂ to form NI₃, but we need decomposition, so incorrect.
• Option C: Includes O₂, incorrect as NI₃ has no O.
• Option D: \( 2NI_3

ightarrow N_2 + 3I_2 \) shows decomposition of NI₃ into N₂ and I₂, balancing atoms (2 N on both sides, 6 I on both sides). Correct.

• Decomposition reaction: A compound breaks into simpler substances (e.g., \( AB

ightarrow A + B \)).

• Synthesis: Simple substances combine into a compound (\( A + B

ightarrow AB \)).

• Single replacement: One element replaces another in a compound (\( A + BC

ightarrow AC + B \)).

• Double replacement: Ions exchange between compounds (\( AB + CD

ightarrow AD + CB \)).

The reaction in Q11 is \( 2NI_3
ightarrow N_2 + 3I_2 \), where a single compound (NI₃) decomposes into two simpler substances (N₂, I₂). So it's decomposition.

Answer:

D. \( 2NI_3
ightarrow N_2 + 3I_2 \)

Question 12