Redox Reaction Oxidation Number

Oxidation is the loss of electron, meaning, there is an increase of oxidation number

• True

• False

Tags

NGSS.HS-PS1-1

The species that gain electron is _____ and usually the ____ agent

• oxidized;oxidizing

• reduced;reducing

• reduced;oxidizing

• oxidized; reducing

The species that loses electron is _____ and usually _____ agent.

• oxidized;reducing

• reduced;oxidizing

• oxidized;oxidizing

• reduced;reducing

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

• Reduced

• Synthesized

• Oxidized

• None of the above

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

• -2

• +2

• +6

• +12

Tags

NGSS.HS-PS1-2

What is the oxidation number of oxygen in water?

• -1

• -2

• 0

• +1

• +2

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

• Oxidized

• Reduced

Tags

NGSS.HS-PS1-2

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

• Zinc

• Hydrogen

• Oxygen

• None

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

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

• Iron

• Fluorine

• Oxygen

Tags

NGSS.MS-PS1-2

WRITE THIS OUT ON PAPER, YOU MAY USE THE ANSWER TO THIS PROBLEM AGAIN IN ANOTHER QUESTION: Balance the following ACIDIC reactions using the half-reaction method. MnO₄⁻(aq) + H⁺(aq) + I⁻ (aq) → Mn²⁺(aq) + I₂(s) Water is a product of this reaction. What is the coefficient of water in the final balanced equation?

• 8

• 5

• 2

• 16