Redox Reaction

Oxygen always has an oxidation number of...

• -1
• 1
• 2
• -2

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

• Oxidized
• Reduced

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

In the reaction Zn + H₂O --> ZnO₂ + H₂

which element, if any, is oxidized?

• Zinc

• Hydrogen

• Oxygen

• None

Another name for a "oxidation-reduction" reaction is

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

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

• Iron
• Fluorine
• Oxygen

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

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

• Oxidized
• Reduced
• Neutralized
• Precipitated

Tags

NGSS.HS-PS1-2

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

• -3
• +4
• -2
• +3

Tags

NGSS.HS-PS1-1

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

• -2
• +2
• +6
• +12

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2