Redox reactions

What element is being Reduced?

Ca₃N₂ +S --> CaS + N₂

• N

• Ca

• S

If an atom loses electrons during a chemical reaction, the atom was:

• Oxidized
• Reduced
• Neutralized
• Precipitated

Tags

NGSS.HS-PS1-2

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

• Increased
• Decreased
• Remained Constant
• Varies Randomly

Tags

NGSS.HS-PS1-2

In the reaction
2Ca(s) + O₂(g) --> 2CaO(s), calcium is __________

• Reduced
• Synthesized
• Oxidized
• None of the above

Tags

NGSS.HS-PS1-2

Which statement is true:
Mg → Mg²⁺ + 2e^–

• Mg gains 2 electrons
• Mg_²⁺ loses 2 electrons
• Mg loses 1 electron
• Mg loses 2 electrons

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-PS1-1

NGSS.HS-PS1-2

What is oxidation number of O in O₂ ?

• 0
• -2
• +1
• +2

Which are examples of reduction?

• I and II

• I and III

• II and III

• I, II and III

Which half-reaction represents reduction?

• Cu⁰ →Cu⁺² + 2e^-

• Fe⁺² → Fe⁺³ + 1e^-

• Ag⁺¹ + 1e^- → Ag⁰

• Al⁰ → Al⁺³ + 3e^-

Mg⁰ → 2e^- + Mg⁺²

The reaction above represents which of the following?

• Oxidation

• Synthesis

• Reduction

• Precipitation