chapter 13: oxidation and reduction

Question 1

what is oxidation state?

Answer 1

• is the charge an atom of an element would have if it existed as an ion in a compound

Question 2

what is the oxidation state of an element?
egs

Answer 2

0

Cu: 0
Cl2:0

Question 3

are neutralisation reactions redox reactions?

Answer 3

NO
- neutralistion reaction: an acid and an alkali react to form salt and water
-there is no change in the oxygen states of hydrogen and oxygen
> not a redox reaction

Question 4

are precipitation reactions redox reactions?

Answer 4

NO
- precipitation reaction: two soluble compounds react to form an insoluble compound
> do not change the oxidation state
> not a redox reaction

Question 5

what are oxidising agents and what are some examples of it?

Answer 5

• a substance that causes another substance to be oxidised
• potassium manganate VII (KMnO4)
• potassium dichromate ( K2Cr2O7)
• bromine ( Br2)
• chlorine (Cl2)
• concentrated sulfuric acid ( H2SO4)
• nitric acid (HNO3)
• oxygen (O2)

Question 6

what are reducing agents and what are some examples?

Answer 6

• a substance that causes another substance to be reduced

-potassium iodide (KI)
- sulfur dioxide (SO2)
- metals
- carbon monoxide (CO)
- carbon
- hydrogen sulfide (H2S)