Water is a Polar Molecule!!☻

Yesterday in Physical Science we learned about the structure of a water molecule. The water molecule is a polar molecule. A polar molecule is a molecule that has slight positive and negative charges due to an imbalance in the way electrons are shared. In the case of a water molecule, the Oxygen atom has a slight negative charge while the 2 Hydrogen atoms have a slight positive charge. These charges give water it's specific properties. Some properties of water are: tasteless, odorless, it is a good solvent,it's cohesive, it has a high boiling point(100 degrees Celsius), it has a low freezing point (0 degrees Celsius).











Other molecules with similar atomic structures that "look like" water but are not polar have very different characteristics. Here are some examples:

Hydrogen sulfide
Hydrogen sulfide (or hydrogen sulphide) is the chemical compound with the formula H2S. This colorless, toxic and flammable gas is partially responsible for the foul odor of rotten eggs and flatulence.

freezing: -85.6 degrees C
Boiling: -60.3 C

Hydrogen selanide
Hydrogen selenide is H2Se, the simplest hydride of selenium. H2Se is a colorless, flammable gas under standard conditions. It is the most toxic selenium compound with an exposure limit: 0.05 ppm over an 8 hour period. This compound has a very irritating smell of decayed horseradish.

freezing: -66 degrees C
Boiling: -42 C

Hydrogen Telluride
Hydrogen telluride is the inorganic compound with the formula H2Te. The simplest hydride of tellurium, it is rarely encountered because of its tendency to decompose to the constituent elements. Most compounds with Te-H bonds are unstable with respect to loss of H2. H2Te is chemically and structurally similar to hydrogen selenide, both are acidic species with H-X-H angles approaching 90°.
freezing: -49 degrees C
Boiling: -2 C