First, the basic attributes of gold
1. Gold, a metal, chemical symbol Au. Physical properties: melting point: 1 0 6 4. 4 3℃, boiling point: 2807℃, density: 19.32g/cc, hardness: 2.5.
2. Gold has good heat transfer, electrical conductivity and corrosion resistance, stable chemical properties, and is not easy to oxidize or react with other substances. It is only soluble in a few solutions, such as mixed acid of hydrochloric acid and nitric acid (aqua regia), potassium cyanide or sodium cyanide and thiourea.
3. Gold is a good conductor of heat and electricity, and its heat transfer and conductivity are second only to a few metals such as mercury, lead and silver.
4. Gold has good toughness and ductility. Under modern processing conditions, it can be made into extremely thin gold foil or drawn into extremely long gold wire.
Two. Basic properties of iron
Iron is a metal element with atomic number 26, and its chemical formula: Fe density is 7.86 g/cm&; # 179; .
Pure iron is white or silvery white with metallic luster. Melting point 1538℃, boiling point 2750℃, soluble in strong acid and medium acid, insoluble in water.
Iron has zero, +2, +3 and +6 valence, of which +2 and +3 valence are common and +6 valence is rare.
Iron is widely distributed in life, accounting for 4.75% of the earth's crust content, second only to oxygen, silicon and aluminum, ranking fourth in the earth's crust content. Pure iron is a silvery white metal with good flexibility and ductility, which is used to make iron cores of generators and motors. Iron and its compounds are also used to make magnets, medicines, inks, pigments, abrasives and so on.
In addition, the human body also contains iron, and ferrous iron with valence of +2 is an important component of hemoglobin, which is used for oxygen transportation.
Three. abstract
In the case of the same volume of gold and iron, because the density of gold is greater than that of iron, gold is heavy. ? Under the same volume condition as iron, gold is heavy. Because that density of gold 19.26 (g/cm3) is great than the density of iron (g/cm3) of 7.87.