Oxidation reduction

What is the oxidation number of Fe in FeO?

• +1
• -1
• +2
• -2

Tags

NGSS.HS-PS1-2

What is the oxidation number of O in CO₂?

• +2
• -1
• +4
• -2

What is the oxidation number of H in CH₄?

• -1
• +1
• -4
• +4

What element's don't have oxidation numbers?

• alkali metals
• noble gases
• halogens
• alkaline earth metals

     In the reaction Zn + H₂O --> ZnO₂ + H₂
 which element, if any, is oxidized? 

• Zinc
• Hydrogen
• Oxygen
• None

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

Oxidation involves

• gaining electrons; gaining oxygen
• losing electrons; losing oxygen
• gaining electrons; losing oxygen
• losing electrons; gaining oxygen

Reduction involves 

• gaining electrons; gaining oxygen
• losing electrons; losing oxygen
• gaining electrons, losing oxygen
• losing electrons; gaining oxygen