Question Video: Identifying the Diagram Representing How Ammonia and Bromine Are Oxidized or Reduced during a Chemical Reaction | Nagwa Question Video: Identifying the Diagram Representing How Ammonia and Bromine Are Oxidized or Reduced during a Chemical Reaction | Nagwa

Question Video: Identifying the Diagram Representing How Ammonia and Bromine Are Oxidized or Reduced during a Chemical Reaction Science • Third Year of Preparatory School

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Ammonia can be reacted with bromine to produce nitrogen and hydrogen bromide. The reaction can be described with the following equation: 2NH₃ (g) + 3Br₂ (g) ⟶ N₂ (g) + 6HBr (g) . Which of the following correctly shows which reactant is the oxidizing agent, which reactant is the reducing agent, and how the reactants are either oxidized or reduced to make the products? [A] Diagram A [B] Diagram B [C] Diagram C [D] Diagram D

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Video Transcript

Ammonia can be reacted with bromine to produce nitrogen and hydrogen bromide. The reaction can be described with the following equation: two NH3 gas plus three Br2 gas react to form N2 gas plus six HBr gas. Which of the following correctly shows which reactant is the oxidizing agent, which reactant is the reducing agent, and how the reactants are either oxidized or reduced to make the products?

This question is asking us to identify which of the reactants is the oxidizing agent and which of the reactants is the reducing agent in this reaction between ammonia and bromine. Let’s clear some space to discuss a few important terms.

Oxidization can be defined as a chemical process that increases the oxygen percentage or decreases the hydrogen percentage in a substance. Conversely, reduction can be defined as a chemical process that decreases the oxygen percentage or increases the hydrogen percentage in a substance. A reactant that oxidizes another reactant is known as an oxidizing agent, whereas a reactant that reduces another reactant is known as a reducing agent.

If we look at the chemical equation provided, we can quickly see that the element oxygen does not play a part in this reaction. However, three hydrogen atoms exist in each molecule of ammonia. So, we can look for a gain or loss of hydrogen to help us answer this question. During the chemical reaction, ammonia loses hydrogen and forms nitrogen gas, or N2. We can also see that bromine gas is converted into hydrogen bromide, or HBr, by gaining hydrogen. By using our definition of reduction, we can say that bromine was reduced because it gained hydrogen. Likewise, using our definition of oxidization, we can say that ammonia was oxidized because it lost hydrogen during the reaction. Based on our discussion so far, we can eliminate answer choices (B) and (C) because these answer choices show that ammonia was reduced. But we know now that it was oxidized.

Since ammonia was oxidized, Br2 must be the oxidizing agent. And since Br2 was reduced, NH3 must be the reducing agent. Knowing this allows us to eliminate answer choice (A), which has the labels for oxidizing agent and reducing agent reversed.

So, which diagram correctly shows which reactant is the oxidizing agent, which reactant is the reducing agent, and how the reactants are either oxidized or reduced to make the products? The correct answer is the diagram in answer choice (D).

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