Redox Reactions and Oxidation States

Play an AI-generated podcast conversation about this lesson

What is the oxidation state of a free element?

+1

0 (correct)

-1

+2

In a monatomic ion, how is the oxidation number determined?

It is always +1.

It is based on the number of protons.

It equals the atomic number of the element.

It equals the charge of the ion. (correct)

What is the oxidation number of hydrogen in most compounds?

0

+1 (correct)

-1

+2

What is the typical oxidation state of oxygen in most compounds?

-2 Signup and view all the answers

When dealing with neutral molecules, what must the sum of the oxidation numbers equal?

0 Signup and view all the answers

What is oxidation in a redox reaction?

Loss of electrons Signup and view all the answers

In the redox reaction Zn(s) + 2H+(aq) → Zn2+(aq) + H₂(g), what happens to zinc?

It loses electrons. Signup and view all the answers

What is the electron transfer process for chlorine in the reaction with sodium?

Chlorine gains electrons. Signup and view all the answers

What best describes the overall redox reaction?

The sum of both oxidation and reduction processes. Signup and view all the answers

Which statement is false about oxidation-reduction reactions?

Reduction involves a gain of protons. Signup and view all the answers

What characterizes a spontaneous reaction?

It occurs without external intervention. Signup and view all the answers

In a redox reaction, oxidation is defined as what process?

Removal of hydrogen or addition of oxygen. Signup and view all the answers

Which of the following reactions demonstrates both oxidation and reduction?

2ZnO + C → 2Zn + CO₂ Signup and view all the answers

What occurs during reduction in a chemical reaction?

Adding hydrogen or removing oxygen. Signup and view all the answers

Which option best describes the relationship between oxidation and reduction?

They happen simultaneously in a redox reaction. Signup and view all the answers

What is the definition of oxidation in a chemical reaction?

Addition of oxygen or loss of electrons Signup and view all the answers

In the reaction between zinc and hydrochloric acid, what happens to zinc?

It loses electrons to form $Zn^{2+}$. Signup and view all the answers

Which of the following statements about reduction is true?

It involves the gain of electrons. Signup and view all the answers

What is the balanced chemical equation for the reaction between zinc and hydrochloric acid?

Zn + 2HCl → ZnCl_{2} + H_{2} Signup and view all the answers

What occurs during the reduction process involving chlorine in the reaction?

Chlorine gains electrons to form $2Cl^{-}$. Signup and view all the answers

What type of reaction occurs in a galvanic cell?

Spontaneous chemical reaction Signup and view all the answers

What is the purpose of the salt bridge in a Daniel cell?

To maintain electrical neutrality Signup and view all the answers

Which substance is produced at the cathode during the reduction reaction?

Hydrogen gas Signup and view all the answers

What is the overall reaction in a Daniel cell?

$2H_2O(l) ightarrow 2H_2(g) + O_2(g)$ Signup and view all the answers

What is the role of the anode in a galvanic cell?

Source of electrons Signup and view all the answers

What occurs at the anode of the Daniel Cell?

Oxidation of Zn Signup and view all the answers

What is the overall galvanic reaction of the Daniel Cell?

$Zn + Cu^{2+} ightarrow Zn^{2+} + Cu$ Signup and view all the answers

What type of current is generated by the redox reaction in the Daniel Cell?

DC current Signup and view all the answers

Which metal has a stronger tendency to lose electrons in the Daniel Cell?

Zn Signup and view all the answers

What happens to Cu ions in solution during the operation of the Daniel Cell?

They accept electrons Signup and view all the answers