General Science: Biology and Chemistry

Gangue is the term used in metallurgy to describe the worthless material (sand, clay, rock, limestone, mica) that surrounds or is mixed with the mineral ore. During ore processing, gangue is separated from the valuable ore through various beneficiation processes like crushing, grinding, and flotation.

Minerals are naturally occurring substances with a definite chemical composition. Ores are specific minerals from which metals can be extracted profitably; therefore, all ores are minerals, but not all minerals are ores.

The nasal passage is the primary cavity located directly behind the nostrils, serving as the first part of the respiratory tract.

The human respiratory system consists of several interconnected organs, including the trachea, bronchi, and lungs, which work together to facilitate gas exchange.

Bauxite is the primary ore of aluminium, consisting mainly of hydrated aluminium oxides.

Cinnabar is a bright red mineral that is the principal ore of mercury (mercury sulfide).

The trachea is a cartilaginous tube that connects the larynx to the bronchi, commonly referred to as the windpipe.

The larynx, located at the top of the trachea, contains the vocal cords and is commonly known as the voice box.

The diaphragm is a dome-shaped sheet of muscle that separates the thoracic cavity, containing the lungs, from the abdominal cavity.

Metallurgy is the branch of science and technology concerned with the properties of metals and their production and purification from ores.

Extraction is the general term for the process of obtaining a metal from its ore through various chemical and physical methods.

The rib cage is a bony structure that protects the thoracic organs, including the lungs and heart.

Pyrolusite is a mineral consisting essentially of manganese dioxide and is the most important ore of manganese.

Alveoli are tiny, balloon-like air sacs at the end of the bronchioles where gas exchange occurs in the lungs.

Carbon is commonly used as a reducing agent in the extraction of metals like zinc from their oxides, as it is cheaper and effectively removes oxygen.

The epidermis is the outermost layer of cells in plant roots, responsible for protection and water absorption.

The root cortex is the tissue layer located between the epidermis and the endodermis, primarily involved in storage.

Highly reactive metals have a strong affinity for oxygen and cannot be reduced by carbon; therefore, they are extracted by the electrolysis of their molten salts.

Calamine is a zinc ore, specifically zinc carbonate (ZnCO3).

A grasshopper is a multicellular organism, whereas Amoeba and Planaria are often used as examples of single-celled or simple organisms.

A ventilator is a medical device that provides mechanical ventilation by moving breathable air into and out of the lungs for patients who cannot breathe on their own.

Mature mammalian red blood cells (erythrocytes) lack a nucleus to provide more space for hemoglobin, which carries oxygen.

During electrolysis, positive metal ions are attracted to the negatively charged electrode, which is the cathode, where they gain electrons to become neutral metal atoms.

White blood cells (leukocytes) are a key part of the immune system and produce antibodies to identify and neutralize pathogens.

Hematite is a common iron oxide mineral and is the most important ore of iron.