Redox Reactions

What is a half-reaction of this equation, Na + Cl --> NaCl ?

• Cl + e^- --> Cl^-

• Cl - e^- --> Cl^-

• Na --> Na + e^-

• Na° + Cl°--> Na⁺¹Cl^-1

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

What is the reducing agent here: N₂ + 3H₂ --> 2NH₃

• N₂

• H_2

• NH₃

• 2NH₃

In the electrolysis of an aqueous solution, which ONE of the following statements is NOT true?

• Electrons are lost by one of the species at the anode.

• Oxidation takes place at the positive electrode.

• Reduction takes place at the cathode.

• Electrons flow around the circuit from the cathode to the negative end of the battery.

Tags

NGSS.HS-PS2-5

NGSS.HS-PS3-5

What is the reducing agent of this reaction?
3Mg + N₂−−−−> Mg₃N₂

• Mg

• N₂

• Mg₃N₂

• MgN

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION: Balance the following reactions using the half-reaction method. MnO₄⁻(aq) + H⁺(aq) + I⁻ (aq) → Mn²⁺(aq) + I₂(s) How many electrons did you cross out on both side?

• 1 e^-

• 2 e^-

• 5 e^-

• 10 e^-

Tags

NGSS.HS-PS1-7

Consider the following REDOX reaction: Cl₂(g) → ClO⁻(aq) + Cl⁻(aq) (basic solution) How many OH^- molecules did you add to the reactant side of this reaction when balancing?

• 1

• 2

• 3

• 4

Consider the following REDOX reaction: Cl₂(g) → ClO⁻(aq) + Cl⁻(aq) (basic solution) Which species is the result of oxidation?

• Cl⁻

• ClO⁻

Tags

NGSS.HS-PS1-2

What is oxidation number of Cr in Cr₂O_7^2-?

• -2

• +2

• +6

• +12

What is oxidation number of O in O₂ ?

• 0

• -2

• +1

• +2

WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION: Balance the following ACIDIC reactions using the half-reaction method. MnO₄⁻(aq) + H⁺(aq) + I⁻ (aq) → Mn²⁺(aq) + I₂(s) Water is a product of this reaction. What is the coefficient of water in the final balanced equation?

• 8

• 5

• 2

• 16