Mercury is a chemical element with an atomic number equal to 80 and an atomic mass equal to 200.59 u. The element symbol of mercury is Hg, which can be expanded as hydrargyrum. The word hydrargyrum has been derived from two Greek words, namely hydor and argyros, meaning water and silver respectively. Mercury is generally known as liquid silver or quicksilver as it is silver in colour, lustrous, and is the only metallic element that tends to maintain its liquid state at room temperature and standard pressure conditions. Mercury is typically placed under the category of transition metal or post-transition metal. According to Roman mythology, the name mercury comes from the Roman god mercury who was known for his swiftness. Mercury is the only element that has retained its alchemical name as the modern chemical common name. Mercury is known to be discovered in and around 2000 BCE and India and China are known to be its discovering nations. The surface tension property of mercury is significantly high which enables it to form rounded beads of liquid. Mercury is one of the rarest elements that are available in Earth’s crust and account for approximately 0.08 parts per million. Mercury is usually found in the mineral cinnabar in the form of mercuric sulfide. To extract pure Mercury from the mineral cinnabar, the ore is crushed and heated in a furnace till the pure mercury gets vaporized. As compared to the conductivity of other metals, mercury is considered to be a relatively poor or mild conductor of heat and electricity. The freezing point of Mercury is equal to -38.8 C, while the boiling point is equal to 356 C. Mercury is immune to chemical reactions with most acidic elements. The electronic configuration of mercury causes it to form weak chemical bonds with other elements and behave like noble gases. The containers that are used to hold and transport mercury from one place to another are generally made up of iron as mercury tends to form amalgams with most metallic elements except iron. Using mercury in applications that make use of aluminium metal is generally not preferable as mercury quickly forms an amalgam with aluminium and disrupts its protective oxide layer, thereby causing the element to corrode.

A chemical change is a change that occurs when the internal structure of a material is altered to generate a new substance. For example, chemical changes can occur during the digestion of food, the burning of wood, the baking of a cake, the curdling of milk, the mixing of acid, the boiling of an egg, the rusting of iron, and so on.

Chemical changes might bring to mind fireworks or explosions. However, some examples of chemical changes are subtle. Explore examples of chemical changes in cooking, nature, and your home. Get an understanding of the difference between physical and chemical changes.

While physical changes can often be reversed, there generally cannot be chemical changes of matter except through various chemical reactions, when a chemical change occurs there is also a change in the energy of the system, the chemical change giving heat is called an exothermic reaction and the one that absorbs heat is called an endothermic reaction.

If you could see every chemical reaction that happens in your body on a daily basis, you would be astounded. These reactions underpin everything we do from the food we eat to the world around us. Let us walk you through your daily life, exposing the science that you probably take for granted.

A fundamental aspect of our world is that chemical changes take place. They transform one substance into another.

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