redox reaction

What element is being Reduced?

• N
• H
• O
• S

Tags

NGSS.HS-PS1-2

What are the coefficients when the equation is balanced?

• 2 + 3 --> 2 + 3 + 4
• 1 + 3 --> 1 + 3 + 2
• 2 + 4 --> 2 + 3 + 2
• 1 + 1 --> 1 + 1 + 1

Tags

NGSS.HS-PS1-7

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

• -2
• +2
• +6
• +12

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

What is oxidation number of H in CaH₂?

• +1
• -1
• 0
• +2

Tags

NGSS.HS-PS1-1

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

• Reduced
• Synthesized
• Oxidized
• None of the above

Tags

NGSS.HS-PS1-2

Another name for a "oxidation-reduction" reaction is

• chemical reaction
• neutralization reaction
• redox reaction
• nuclear reaction

Reduction is the ___________ of electrons.

• loss

• gain

• sharing

• transfer

Which of the following represents oxidation?

• C → CH₄

• Fe³⁺ → Fe²⁺

• Cl₂ → 2Cl^-

• Zn → ZnO

Tags

NGSS.HS-PS1-1

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

As an element is oxidized, its oxidation number...

• increases as electrons are gained

• decreases as electrons are gained

• decreases as electrons are lost

• increases as electrons are lost

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2