Oxidising and Reducing Agents

Question 1

OILRIG

Answer 1

Oxidation is loss

Reduction is gain

Question 2

A reducing agent

Answer 2

usually a metal or negative ion

loses electrons to another element or ion (reducing the other species)

it itself is oxidised

Question 3

Strongest reducing agents

Answer 3

Alkali metals (grp 1) as they have low electronegativities and lose electrons easily

Question 4

Molecules used in chemical industry as reducing agent to help extract metals

Answer 4

CO

Question 5

oxidising agent

Answer 5

normally non-metal or positive ion

cause oxidation reactions to take place

gains electrons from other atoms or ions (it itself is reduced)

Question 6

strongest oxidising agents

Answer 6

highly electronegative halogens grp 7

Question 7

uses for oxidising agents

Answer 7

effective in killing fungi and bacteria, and can inactivate viruses

Question 8

strong oxidising agents in acidic solution

Answer 8

dichromate

permanganate

useful for forming aldehydes, ketones, carboxylic acids from alcohol molecules

hydrogen peroxide - breaking down coloured compounds whether hair or clothes

Question 9

redox reaction

Answer 9

both oxidation and reduction

add together the two ion-electron equations representing each half step - must be balanced

Question 10

example of redox reactions

Answer 10

displacement reactions

Question 11

write complex ion-electron equation

Answer 11

balance atoms that are already present on both sides

if number of oxygen atoms needed to balance, add some number of water molecules to opposite side

add twice number of hydrogen as water to opposite side

complete equation by adding total number electrons needed to balance overall charge

Question 12

strongest oxidising agents on periodic table

Answer 12

bottom left column

Question 13

strongest reducing agents in periodic table

Answer 13

top right column