redox reactions 🐂

Question 1

what is oxidation? (x4)

Answer 1

1) gain of oxygen with no other changes to the substance
2) loss of hydrogen with no other changes to the substance
3) loss of electrons
4) increase in oxidation state of an element

Question 2

what is reduction? (x4)

Answer 2

1) loss of oxygen with no other changes to the substance
2) gain of hydrogen with no other changes to the substance
3) gain of electrons
4) decrease in oxidation state of an element

Question 3

electronegativity series for oxidation state

Answer 3

F > O > Cl > N > Br > I > C > H

Question 4

what is a disproportion reaction

Answer 4

a single substance is both oxidised and reduced in the reaction

Question 5

test for reducing agents (using known oxidising agents)

Answer 5

1) KMnO4 purple potassium manganate turns colourless (+7 to +2)
2) K2Cr2O7 orange potassium dichromate turns green (+6 to +3)
3) FeCl3 yellow iron (III) chloride turns pale green (+3 to +2)
4) I2 brown aqueous iodine turns colourless (0 to -1)

Question 6

test for oxidising agents (using known reducing agents)

Answer 6

1) KI colourless potassium iodide turns brown (-1 to 0)
2) FeSO4 pale green iron (II) sulfate turns yellow (+2 to +3)