Redox reactions-Review

What element is being Oxidized?

• N
• H
• O
• S

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

What element is being Reduced?

• N
• H
• O
• S

Tags

NGSS.HS-PS1-2

     In the reaction Zn + H₂O --> ZnO₂ + H₂
 which element, if any, is oxidized? 

• Zinc
• Hydrogen
• Oxygen
• None

Tags

NGSS.HS-PS1-2

A decrease in oxidation number.

• concentrated

• reduction

• oxidation

• dilute

An increase in oxidation number.

• more acidic

• reduction

• less basic

• oxidation

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-1

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-PS1-1

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

• N₂

• H_2

• NH₃

• 2NH₃

Tags

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

__________ is reduced in the following reaction:
Cr₂O₇^2- + 6 S₂O₃^2- + 14H⁺  >   2Cr³⁺ + 3S₄O₆^2- + 7H₂O

• Cr₂O₇^2-
• S₂O₃^2- 
• H⁺
• S₄O₆^2-

Tags

NGSS.HS-PS1-2

What is the coefficient of the permanganate ion when the following equation is balanced?

MnO₄^- + Br^- >  Mn²⁺ + Br₂
 (acidic solution)

• 5
• 2
• 4
• 3