Chemical Description

Topics: Oxygen, Water, Acetic acid Pages: 5 (664 words) Published: March 2, 2013


Chemical #1


Calcium Carbonate - CaO3

Density|   * 2.71 g/cm3 (calcite) * 2.83 g/cm3 (aragonite)| Exact mass| * 100.0869 g/mol|
Molecular Formula| * CaO3|
Melting point| * 825 °C (calcite) * 1339 °C (aragonite)| Boiling point| * Decomposes|
Acidity| * 9.0|
Flash point| * Non flammable|
Crystal structure| * Trigonal|
Other names| * Limestone, Marble, Chalk, Calcite and pearl.|

Calcium carbonate is a chemical compound with the chemical formula CaCO3. It is one of the most common substances found in rock in every part of the world, and is the main ingredient in shells, marine organisms, snails, pearls, and eggshells. Calcium carbonate is the active ingredient in agricultural lime, and is usually the top cause of hard water. It is commonly used medicinally as a calcium supplement or as an antacid, but extreme use can be risky.

Word meanings

Antacid: It is any substance which neutralizes stomach acidity, usually a base or a basic salt.

Chemical #2


Silicon dioxide - SiO2

Density| * 2.634 g/cm3|
Exact mass| * N/A|
Molecular Formula| * SiO2|
Melting point| * 1650(±75) °C|
Boiling point| * 2230 °C|
Acidity| * N/A|
Flash point| * Non-Flammable|
Crystal structure| * Explanation bellow, after main.|
Other names| * Silica, Quartz |

The chemical compound silicon dioxide, also known as silica (from the Latin silex), is an oxide of silicon with a chemical formula of SiO2 and has been known for its hardness for centuries. Silica is most commonly found in nature as sand or quartz, as well as in the cell walls of diatoms. Silica is the riches mineral in the Earth's crust. The crystal structure of Silicon Dioxide changes as the compound heats up. The original structure is trigonal, but when it heats up to 573C°, its structure changes to hexagonal.

Word meanings

Diatoms: A main group of eukaryotic algae, and are one of the most common types of phytoplankton.

Chemical #3


Sodium Chloride - NaCl

Density| * 58.443 g/mol|
Exact mass| * 58.443 g/mol|
Molecular Formula| * NaCl|
Melting point| * 801 °C,|
Boiling point| * 1413 °C|
Acidity| * 6.7 – 7.3|
Flash point| * Non Flammable|
Crystal structure| * Face-centred cubic |
Other names| * Halite, Saltex, Sodium monochloride. |

Sodium chloride is an ionic compound with the formula NaCl. Sodium chloride is responsible for the salty taste in the ocean and the body fluid that is outside of cells of most multi-cellular organisms. It is frequently used as a food preservative and everyday seasoning.

Word Meanings

Ionic compound: Is when atoms or molecules are held together in a patterned structure.

Chemical #4


Hydrogen Oxide - H2O

Density| * NA|
Exact mass| * 18.01528 g/mol|
Molecular Formula| * H2O|
Melting point| * Liquid|
Boiling point| * 100C°|
Acidity| * neutral|
Flash point| * Non-flammable|
Crystal structure| * NA|
Other names| * NA|

One water molecule is made up of two hydrogen atoms covalently bond to a single oxygen atom (H2O). Water is the most common compound on Earth and is making up about 70% of the planet's surface. In nature water can be found as a liquid (river), solid (iceberg), and gaseous state (fog). Water at room temperature is nearly colourless with a hint of blue, it is odourless and tasteless. .

Word meanings:

Covalently bond: It is a form of chemical bonding that is distinguished by the sharing of pairs of electrons between atoms.

Chemical #5

White vinegar

Acetic Acid - CH3 COOH + H2O

Density| * 1.049 g/cm3 (l) * 1.266 g/cm3 (s)|...
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