Redox Reactions

What is the oxidation number of N in NO_2^-1?

• -3
• +4
• -2
• +3

If in a reaction, copper is reduced; its number of electrons has:

• Increased
• Decreased
• Remained Constant
• Varies Randomly

Tags

NGSS.HS-PS1-2

What substance is oxidized in the following reaction?
4Fe + 3O₂ --> 2Fe₂O₃

• Iron
• Fluorine
• Oxygen

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Defined as the loss of electrons.

• oxidation

• reduction

• redox

• OIL RIG

Tags

NGSS.HS-PS1-1

What is the oxidation number of C in SrCO₃?

• -4

• +2

• -6

• +4

Defined as the gain of electrons.

• oxidation

• redox

• reduction

• LEO GER

Which change does nitrogen undergo oxidation?

• A
• B
• C
• D

Tags

NGSS.HS-PS1-2

NGSS.HS-PS1-7

Which expression represents the oxidation of the copper(I) ion?

• Cu⁺---->  Cu²⁺ + e^–  
• Cu ----> Cu⁺ + e^– 
• Cu⁺ + e^– ----> Cu⁰
• Cu⁺ + e^– ----> Cu²⁺

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

Combustion and single-replacement reactions are __________ redox reactions.

• always

• never

• sometimes

• mostly