REDOX

Vocabulary

100

What is the acronym to help memorise redox reactions?

OIL RIG

200

What is the half reaction called for gaining electrons?

Reduction

300

What is the substance that causes another substance to undergo oxidation called?

Reducing agent/reductant

400

What is the table of reduction reactions showing the order of oxidant strength called?

Electrochemical series

500

What is the number assigned to elements in order to determine whether they may have undergone oxidation or reduction in a reaction?

Oxidation number/ oxidation state

Oxidation Number

100

What is the oxidation number for Na(s)?

0

200

What is the oxidation number for Ca2+ (aq) ?

2+

300

What is the oxidation number for F?

-1

400

What is the oxidation number for S in H2SO4(aq)?

+6

500

What is the oxidation number of Cl in Fe(ClO2)3?       

+3 

Half-equations

100

Write the simple half equation from Na(s) to Na+(aq) on the board.

Na(s) --> Na+(aq) + e-

200

Write the simple half equation for Cl2(g) to Cl-(aq) on the board.

Cl2(g) + 2e- -->  2Cl-(aq)

300

Write the reduction half equation from H+(aq) to H2(g) on the board.

2H+(aq) + 2e- --> H2(g)

400

Balance the complex oxidation reaction of N to NO₃^-

N+3H2O --> NO3- + 6H+ + 5e-

500

Balance the complex reduction reaction of Al₂O₃ to 

Al³⁺

Al₂O₃ + 6H+ + 3e- --> 2Al³⁺ + 3H20

Random

100

Give 2 examples where redox reactions are used in our daily lives.

Corrosion, combustion, Rusting...

200

Which list shows the metals in order of increasing reactivity?

a) Au <Zn < Ca< K

b) K< Ca< Zn< Au

B

300

Looking at the reactivity series, will copper displace silver ions? Explain why or why not.

Yes as silver ions is higher (oxidising agent) and will react with copper which is lower in the reactivity series ( reducing agent).

400

Define what is a conjugate redox pair. Give an example.

A conjugate redox pair is made up of two species (an oxidant and a reductant) which differ by the number of electrons that have been transferred.

 •For Example: Mg 2+ (aq) / Mg (s); Cu 2+ (aq) / Cu (s)

500

List 2 functions of the salt bridge.

1. Complete the internal circuit

2. Balance the overall charge in the two half cells.

How well do you know Miss Lee

100

What nationality is Miss Lee?

Hong Kong

200

What two instruments can Miss Lee play?

Piano and violin

300

Which 4 classes does Miss Lee teach this year?

12 chem, 11 chem, 9 maths, 8 science

400

Which item from the school canteen is Miss Lee allergic to?

Shin Ramyun!

500

How many whiteboard markers do Ms Lee carry around in her pencil case? What are the colours?

5 - black, blue, red, green, orange