Oxidation and Reduction

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

• Zinc

• Hydrogen

• Oxygen

• None

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

• Iron

• Fluorine

• Oxygen

Tags

NGSS.HS-PS1-7

________________ is the gain of oxygen atoms.

________________ is the loss of oxygen atoms.

Is this an oxidation or reduction reaction?

water → hydrogen + oxygen

• Oxidation

• Reduction

Which element has been reduced?

• iron

• lithium

• oxide

• iron oxide

Reduction involves 

• gaining electrons; gaining oxygen

• losing electrons; losing oxygen

• gaining electrons, losing oxygen

• losing electrons; gaining oxygen

Tags

NGSS.HS-PS1-7

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

• Li

• Na

• O

• H

Tags

NGSS.HS-PS1-2

What is happening to the chemical in bold?

Aluminium oxide --> aluminium + oxygen

• Oxidation

• Reduction

Tags

NGSS.MS-PS1-2