Electrochemistry Part I: Redox Reactions and Electrochemical Cells

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What is the oxidation number of Cl in the compound NaCl?

+2

0

+1

-1 (correct)

According to the Redox Reaction Rule 2, what is the oxidation number of an ion?

Always -1

Dependent on the element

Always +1

Equal to its charge (correct)

In which compound does oxygen have an oxidation number of -1?

H2O2 (correct)

OF2

NaF

MgO

What is the oxidation number of magnesium in the compound MgO?

+2 Signup and view all the answers

Which element in a compound always has an oxidation number of -1?

Fluorine Signup and view all the answers

According to the Redox Reaction Rule 4, when is the oxidation number of hydrogen +1?

When bonded to non-metals Signup and view all the answers

What is the oxidation number of chlorine in hypochlorous acid (HClO)?

+1 Signup and view all the answers

In the compound sodium chloride (NaCl), what is the oxidation number of sodium?

-1 Signup and view all the answers

Which compound demonstrates the Redox Reaction Rule 7 regarding halogens combined with oxygen or fluorine?

Perchloric acid (HClO₄) Signup and view all the answers

What is the oxidizing agent in the reaction: Fe2+ (aq) + Co(s) → Fe(s) + Co2+ (aq)?

Co2+ Signup and view all the answers

What is the reducing agent in the reaction: K (s) + Cl2 (g) → KCl (s)?

K Signup and view all the answers

In the chemical equation: SnCl2 (aq) + 2FeCl3 (aq) → SnCl4 (aq) + 2FeCl2 (aq), what is being oxidized?

SnCl2 Signup and view all the answers

What is the defining characteristic of an oxidation reaction?

Increase in the oxidation number of a substance Signup and view all the answers

Which of the following describes the role of an oxidizing agent?

Causes oxidation by accepting electrons Signup and view all the answers

What does an oxidation number indicate about an atom?

Whether it loses or gains electrons Signup and view all the answers

Which process involves a decrease in the oxidation number of a substance?

Addition of hydrogen to a substance Signup and view all the answers

What happens to the oxidation state of a reducing agent during a redox reaction?

Increases Signup and view all the answers

In a reduction reaction, there is a:

Gain of electrons to a substance Signup and view all the answers

What is the primary focus of electrochemistry?

Relating chemical reactions to electricity Signup and view all the answers

In electrochemistry, what is the role of oxidation and reduction in redox reactions?

They occur simultaneously Signup and view all the answers

What does a redox reaction consist of?

Two half-reactions Signup and view all the answers

Why do oxidation and reduction occur simultaneously in redox reactions?

To balance charges Signup and view all the answers

What happens in a non-spontaneous chemical reaction with electricity according to the text?

Reduction reaction Signup and view all the answers

What process involves the movement of electrons according to the text?

Oxidation only Signup and view all the answers

What is the function of the cathode in an electrochemical cell?

Accepts electrons from the external circuit Signup and view all the answers

In a galvanic cell, which electrode is the positive electrode?

Cathode Signup and view all the answers

What happens at the anode in a galvanic cell?

Loses electrons (oxidized) Signup and view all the answers

Which component of a voltaic cell causes the movement of electrons through the external circuit?

Connecting wires Signup and view all the answers

What type of reaction occurs in a galvanic cell to produce electrons?

Spontaneous Signup and view all the answers

What is the role of the salt bridge in an electrochemical cell?

Facilitates the movement of ions to balance charge Signup and view all the answers