oxidising and reducing agents

Question 1

reduction

Answer 1

gain of electrons by a reactant in any reaction

Question 2

oxidation

Answer 2

loss of electrons by a reactant in any reaction

Question 3

redox reaction

Answer 3

reduction and oxidation take place at same time

Question 4

oxidising agent

Answer 4

accepts electrons
oxidises something else
is itself reduced
tend to be more negative

Question 5

reducing agent

Answer 5

donates electrons
reduces something else
is itself oxidised
tend to be more positive

Question 6

electronegativity

Answer 6

metals have low values - positive ions, act as reducing agents, lose electrons
non-metals have low values - negative ions, act as oxidising agents, gain electrons

Question 7

strongest reducing agents

Answer 7

group 1
top right hand column of electrochemical series
alkali metals

Question 8

strongest oxidising agents

Answer 8

group 7
bottom left hand column of electrochemical series
halogens

Question 9

oxidising agents used as a chemical to

Answer 9

bleach clothes or hair as they break down coloured compounds
kill fungi and bacteria and inactive viruses

Question 10

ion-electron equations

Answer 10

1. balance all atoms except O and H
2. balance O with H2O
3. balance H with H+
4. add e- to most positive side to balance charge

Question 11

redox equations

Answer 11

combining reduction and oxidation equations
cancel out electrons with multiplication if necessary