Redox Quiz

common redox reactions in everyday life

corrosion and rust, batteries and power (chemical energy is converted into electrical energy), and biological energy (food is broken down to release energy in cells)

oxidation

chemical process in which a substance loses electrons during a reaction

as electrons are lost…

oxidation number increases

reducing agent

substance that oxidizes

reduction

chemical process in which a substance gains electrons during a reaction

as electrons are gained…

oxidation number decreases

oxidizing agent

substance that reduces

oxidation and reduction always happen…

in conjunction with one another

redox reaction (reduction-oxidation reaction)

chemical process involving the transfer of electrons between two species

the oxidation number of any pure element (including diatomic gases) is…

0

the oxidation number of a monatomic ion is…

equal to the charge of the ion

the oxidation number of group 1 elements is…

+1

the oxidation number of group 2 elements is…

+2

the oxidation number of aluminum is…

+3

the oxidation number of hydrogen is…, unless combined with a metal, where it becomes…

+1; -1

in a binary compound, the oxidation number of the more electronegative element is…

equal to the charge it would have if it were an ion

the sum of the oxidation numbers of all atoms in a neutral compound is…

0

the sum of the oxidation numbers of a polyatomic ion is…

equal to the charge of the ion

use algebra to find oxidation numbers with…

covalent compounds

peroxide

compound containing an oxygen-oxygen single bond

the oxidation number for a peroxide is…

-1

the three peroxides are…

hydrogen peroxide (H₂O₂), sodium peroxide (Na₂O₂), and zinc peroxide (ZnO₂)

dioxide

compound containing two oxygen atoms bonded to another element

the oxidation number of oxygen is not -2 when…

in a compound with fluorine or any peroxide

metal hydrides…

have the H second

in a redox half reaction, the electrons go on the side with…

the more positive oxidation number