Half 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-PS1-1

NGSS.HS-PS1-2

Which of the following half reactions correctly represents a reduction half reaction?

• Fe →Fe²⁺ + 2e^-
• Pb⁴⁺ + 2e^- →Pb²⁺
• 2O^-2 →O₂ + 4e^-
• Fe + 3e^- →Fe³⁺

Tags

NGSS.HS-PS1-7

Which of the following reactions is balanced by both mass and charge?

• Fe⁺² + Al →Fe + Al⁺³
• Cu + Fe⁺² → Cu⁺¹ + Fe⁺³
• F₂ + Br^- --> F^- + Br₂
• Fe⁺² + 2 Cu --> 2 Cu⁺ + Fe

Tags

NGSS.HS-PS1-7

Which of the following represents oxidation?

• C → CH₄

• Fe³⁺ → Fe²⁺

• Cl₂ → 2Cl^-

• Zn → ZnO

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

In the half equation:

Cu --> Cu²⁺ + 2e^-

Copper undergoes...

• Spectatorship

• Reduction

• Deprotonation

• Oxidation

Which of the following is the balanced half -reaction for the oxidation of Cu to Cu^+2?

• Cu   --> Cu⁺²
• Cu + 2 e-   --> Cu⁺²
• Cu  --> Cu⁺²  + 2 e-
• Cu - 2e-  --> Cu⁺²

Tags

NGSS.HS-PS1-7

Which change does nitrogen undergo oxidation?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What happens to Cr³⁺ ion when it is converted to CrO₄^2–

• Oxidation number decreases and it undergo reduction
• Oxidation number decreases and it undergo oxidation
• Oxidation number increases and it undergo reduction
• Oxidation number increases and it undergo oxidation

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What happens to iodine when iodate, IO₃^–, converted to iodine, I₂?

• Undergo reduction and oxidation number changes from –1 to 0
• Undergo oxidation and oxidation number changes from –1 to 0
• Undergo reduction and oxidation number change from +5 to 0
• Undergo oxidation and oxidation number change from +5 to 0

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which equation shows an oxidation reaction?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-2