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Metals react with water to release hydrogen gas.

Hydrogen gas is also formed when metals such as aluminum, zinc, magnesium, and iron react with acid.

Materials used to reduce friction are called lubricants,
Methods for decreasing friction:
Make the surfaces smoother. Rough surfaces produce more friction and smooth surfaces reduce friction.
Lubrication is another way to make a surface smoother. …
Make the object more streamlined. …
Reduce the forces acting on the surfaces. …
Reduce the contact between the surfaces.

Silicon has atomic number of 14.
Silicon has two electrons in its first shell, eight electrons in the second shell, and four electrons in the third shell.
Since the electrons in the third shell are the outermost electrons, silicon has four valence electrons.

Number of neutrons=A-Z.
A=4,Z=2
4-2=2.

In an atom, number of protons and electrons are equal. Hence there will be 32 protons present.

Heavy hydrogen: Deuterium
Radioactive isotope of hydrogen: Tritium

Willard Frank Libby was an American physical chemist noted for his role in the 1949 development of radiocarbon dating, a process which revolutionized archaeology and palaeontology. For his contributions to the team that developed this process, Libby was awarded the Nobel Prize in Chemistry in 1960.

Sericulture – Silkworm rearing, Epiculture – Beekeeping, Pisci culture – Fish rearing.

Centrifugation – A device called a centrifuge that separates the insoluble particles in a liquid mixture by their weight.
Separation of two liquids in a mixture is carried out by using centrifugal force is known as centrifugation.
Here the lighter medium comes towards the axis and denser medium goes away from the axis.

All animals and humans store some glucose in the cells so that it is available for quick shots of energy. When there is excess of glucose in the body, it is stored in the liver as the large compound called glycogen.
Glycogen is storage polysaccharides of animal cells. Excess glucose is stored as glycogen in liver and muscles

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