Multiple Choice
In a redox reaction, which term best describes a reduction?
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6. Chemical Quantities & Aqueous Reactions
Redox Reactions
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Which of the following chemical reactions is an oxidation-reduction (redox) reaction?
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Verified step by step guidance1
Identify the oxidation states of all elements in each reactant and product for each given reaction. This will help determine if any element undergoes a change in oxidation state.
For the first reaction, assign oxidation numbers to sodium (Na), phosphorus (P), oxygen (O), and magnesium (Mg) in both reactants and products. Check if any element's oxidation state changes.
For the second reaction, assign oxidation numbers to hydrogen (H), chlorine (Cl), sodium (Na), and oxygen (O) in both reactants and products. Determine if there is any change in oxidation states.
For the third reaction, assign oxidation numbers to calcium (Ca) and carbonate ion (CO3^2-) in reactants and products. Check for any changes in oxidation states.
For the fourth reaction, assign oxidation numbers to zinc (Zn) and copper (Cu) in both reactants and products. If you find that the oxidation states of Zn and Cu change (Zn is oxidized and Cu is reduced), then this reaction is a redox reaction.
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