Silver is a transition metal. Chemical symbol Ag. Silver is one of the metals known and used in ancient times, and it is an important precious metal. Silver exists in the form of simple substance in nature, but most of it exists in silver mines in the form of bound state. Silver has relatively stable physical and chemical properties, good thermal and electrical conductivity, soft texture and rich ductility. Its reflectivity is extremely high, reaching over 99%. It has many important uses.

Silver is a white and shiny metal, and its atomic structure is face-centered cubic structure.

Silver is dissolved in nitric acid to produce silver oxide, which further reacts with undecomposed nitric acid to produce silver nitrate.

Ag+2HNO3 (concentrated) = AgNO3+H2O+NO2 =

3Ag+4HNO3 (dilution) = 3agno3+2h2o+no =

Silver is not easy to react with sulfuric acid, so sulfuric acid can be used to clean the copper oxide fire marks left by silver welding annealing in jewelry manufacturing. Silver easily reacts with sulfur and hydrogen sulfide to form black silver sulfide, which is often found on tarnished silver coins or other articles. Silver can react with oxygen at high temperature to produce brown-black silver oxide (it can also react at room temperature, but the speed is very slow). In the presence of potassium bromide (KBr), metallic silver will be eroded by strong oxidants such as potassium permanganate or potassium dichromate. These compounds are used in photography to bleach visible images and convert them into silver halide, which can be removed by sodium thiosulfate and re-developed to enhance the original images.

React with hydrogen sulfide and oxygen

4ag+2h2s+O2 = = 2ag2s+2h2o (the principle of silver deterioration and blackening at room temperature).

It reacts with concentrated sulfuric acid to produce silver oxide and then silver sulfate.

2Ag+2H2SO4 (concentrated) = = = = Ag2SO4 ↓+SO2 ↑+2h2o

React with sulfur

2ag+s = = = ag2s (mixing can react)

React with oxygen

4ag+O2 = = = 2ag2o (the reaction is obvious when heated to 1000℃ in pure oxygen, but slow in room temperature air).

I hope it can help you solve the problem.