Identify Redox or Precipitate

Oxygen always has an oxidation number of...

• -1
• 1
• 2
• -2

Tags

NGSS.HS-PS1-1

Reduction involves 

• gaining electrons; 
• losing electrons; 

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

• Iron
• Fluorine
• Oxygen

Is calcium oxidized or reduced in the following reaction? 
2CaO--> 2Ca + O₂

• Oxidized
• Reduced

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which species is oxidized in the following reaction? 
Mg + AlCl₃ --> MgCl₂ + Al

• Mg
• Al
• Cl
• None because this is not redox.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Which substance is reduced in the following reaction? 
NaOH + Li --> LiOH + Na

• Li
• Na
• O
• H

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

N₂ +O₂ --> 2NO
Determine which substance is oxidized and which is reduced.

• Nitrogen is oxidized and Oxygen is reduced. 
• Nitrogen is reduced and Oxygen is oxidized. 

Tags

NGSS.HS-PS1-1

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

• -3
• +4
• -2
• +3

Tags

NGSS.HS-PS1-1

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