The accompanying photo shows the reaction between a solution of Cd(NO 3 ) 2 and one of Na 2 S. (d) Is this a redox reaction?

Hi everyone for this problem. It reads what type of reaction occurs between copper and silver nitrate. So let's go ahead and start off by writing this out. We have copper plus silver nitrate and we want to know what type of reaction this is. So let's identify what is here. We have copper which is a metal. And we have silver which is also a metal. Okay, And let's go ahead and label these as a B. And see. Okay, so we have because we have two medals here, we're going to look at the activity series table because we need to look at the reactivity of the elements involved here. Okay, so our activity series table tells us our most reactive to our least reactive. And when we look at the activity series table, we see that copper is higher than silver. So that means copper is going to be more reactive than silver. And more reactive elements will replace less reactive elements in a single replacement reaction. Okay. And so what this looks like then, is our copper is going to replace the silver here. And so when we rewrite this out, we're going to get copper and our nitrate plus our silver. Okay, so this type of reaction we said is a single replacement reaction. And all single replacement reactions are also redox oxidation reactions as well. So, our answer for this problem is that the type of reaction is a redox reaction. Okay, so this is going to be our final answer and that is it for this problem. I hope this was helpful

Ch.4 - Reactions in Aqueous Solution

Brown - Chemistry: The Central Science 15th Edition

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Ch.4 - Reactions in Aqueous Solution

Problem 92d

Chapter 4, Problem 92d

The accompanying photo shows the reaction between a solution of Cd(NO₃)₂ and one of Na₂S. (d) Is this a redox reaction?

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Identify the reactants and products in the reaction: Cd(NO_3)_2 and Na_2S react to form CdS and NaNO_3.

Determine the oxidation states of each element in the reactants and products. For example, in Cd(NO_3)_2, Cd is +2 and in Na_2S, S is -2.

Check if there is a change in oxidation states for any of the elements from reactants to products. In CdS, Cd is still +2 and S is still -2, indicating no change.

Since there is no change in oxidation states, this indicates that no electrons are transferred between the elements.

Conclude that the reaction is not a redox reaction, as there is no change in oxidation states of the elements involved.

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Key Concepts

Here are the essential concepts you must grasp in order to answer the question correctly.

Redox Reactions

Redox reactions, or reduction-oxidation reactions, involve the transfer of electrons between two species. In these reactions, one substance is oxidized (loses electrons) while another is reduced (gains electrons). Identifying whether a reaction is a redox process requires analyzing the oxidation states of the elements involved before and after the reaction.

Oxidation States

Oxidation states (or oxidation numbers) are a way to keep track of electrons in chemical reactions. They indicate the degree of oxidation of an atom in a compound, helping to determine whether an atom has gained or lost electrons. In the context of the given reaction, calculating the oxidation states of cadmium (Cd) and sulfur (S) will clarify if any changes occur, indicating a redox reaction.

Ionic Compounds and Solubility

Ionic compounds, such as Cd(NO3)2 and Na2S, dissociate into their constituent ions when dissolved in water. Understanding the solubility of these compounds is crucial, as it affects the reaction dynamics. The formation of precipitates or soluble ions can influence whether a redox reaction occurs, as the physical state of the reactants can determine the pathway of the reaction.

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The accompanying photo shows the reaction between a solution of Cd(NO₃)₂ and one of Na₂S. (b) What ions remain in solution?

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The accompanying photo shows the reaction between a solution of Cd(NO3)2 and one of Na2S. (d) Is this a redox reaction?

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Key Concepts

Redox Reactions

Oxidation States

Ionic Compounds and Solubility

The accompanying photo shows the reaction between a solution of Cd(NO₃)₂ and one of Na₂S. (d) Is this a redox reaction?