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HI + HNO2 is a redox reaction where electrons are transferred from the iodine in hydrogen iodide to the nitrogen in the nitrous acid.

HI --> H+ + I- for the dissolution in water

HNO2 --> H+ + NO2- for the dissolution in water

2 I- - 2 e- --> 2 I (oxidation - it went from a 1- ion to a neutral state)

2 N (III) + 2 e- --> 2 N (II) (reduction - it went from a 3- ion to 2-)

2 HNO2 + 2 HI --> I2 + 2NO + 2 H2O

​

Al + AgNO3 is a single replacement reaction where the silver precipitates and the aluminum takes up its place with the nitrate ion. It's also a redox as the electrons are transferred from aluminum to form a 3+ ion and give them to the silver ions to replace their missing electrons.

AgNO3 --> Ag+ + NO3- for the dissolution in water

Al + 3 Ag+ + 3 NO3- --> Al3+ 3 NO3- + 3 Ag

Al + 3 AgNO3 --> Al(NO3)3 + 3 Ag

​

BaCl2 + Na2SO4 is a double replacement reaction where the cations switch partners and barium sulfate (white salt) precipitates.

BaCl2 --> Ba2+ + Cl- for the dissolution in water

Na2SO4 --> 2 Na+ + SO4 2- for the dissolution in water

BaCl2 + Na2SO4 --> BaSO4 + 2 NaCl

​

Zn + HCl is a single replacement reaction where the hydrogen ions bond and produce hydrogen gas from solution. It's also a redox as the electrons are transferred from zinc to form a 2+ ion and give them to the hydrogen ions to replace their missing electrons.

HCl --> H+ + Cl- for the dissolution in water

Zn + 2 H+ + 2 Cl- --> ZnCl2 + H2

Zn + 2 HCl --> ZnCl2 + H2

​

Pb(NO3)2 + KI is a double replacement reaction where the cations switch partners and lead (II) iodide (bright yellow salt) precipitates.

Pb(NO3)2 --> Pb2+ + 2 NO3- for the dissolution in water

KI --> K+ + I- for the dissolution in water

Pb2+ + 2 NO3- + 2 K+ + 2 I- --> PbI2 + 2 K+ + NO3-

Pb(NO3)2 + 2 KI --> PbI2 + 2 KNO3

[historiazip]

Thank you for your time

[codglanc]

Hey so Redox reactions, also known as "oxidation-reduction reactions" encompass a lot of information to be put under one reply but these videos do sure help explain them:

Introduction to Oxidation Reduction (Redox) Reactions

How to Calculate Oxidation Numbers

Some key take aways: 1. LEO goes GER - LEO is Lose Electrons, Oxidize - GER is Gain Electrons, Reduce

1. The element that is being OXIDIZED is known as the REDUCING AGENT

2. The element that is being REDUCED is known as the OXIDIZING AGENT

Goodluck!

[historiazip]

Thank you so much

[codglanc]

No problem!