Redox Reaction Oxidation Number

What is the oxidation number of oxygen in most cases?

• -2

• +1

• -1

• +2

What is the oxidation state of hydrogen in compounds?

• 0

• +1

• +2

• -1

What is the key concept to remember in redox reactions?

• OILRIG - Oxidation is loss of electrons, reduction is gain of electrons

• Redox reactions involve only protons

• Oxygen is the most important element

• Electronation and de-electronation

What is the oxidation state of an element by itself?

• 0

• +1

• +2

• -1

What is the final step in balancing a redox equation?

• Combining the half-reactions

• Writing the half-reactions

• Determining the reaction products

• Assigning oxidation states

Reduction happens at the 

• anode

• cathode

• salt bridge

• voltmeter

Tags

NGSS.HS-PS2-5

In a redox reaction, spectator ions...

• become oxidised

• become reduced

• remain unchanged

The sum of the oxidation numbers in SCN^- is equivalent to

• 0

• -1

• +1

• +3

What is the oxidation number of iodine in KIO₃?

• 0

• -1

• +5

• +1

Which are examples of reduction?

• I and II

• I and III

• II and III

• I, II and III

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2