Biology: Water

Why is Solid water less dense than liquid water?

Solid water is less dense than liquid water due to Hydrogen Bonds. At 0 degrees Celsius, water molecules start to solidify and the hydrogen bonds in those water molecules form crystalline structures that space molecules apart more evenly, in turn making frozen water less dense than its liquid form

Hydrophillic Subtances

Substances in which their polarity is stronger than the cohesive forces of the water

Water molecule is _ shaped because

The Water molecule is V-Shaped because the oxygen atom has a negative charge, while the hydrogen atoms have a positive charge.

Hydrogen Bonds

The positive pole around those hydrogen atoms bonds to the negative pole around the oxygen atoms of a different water molecule. This is a weak bond.

Water Molecule

Two Hydrogen, one oxegen. The hydrogens each sharing an electron with oxygen(in a covalent bond)

Water has the ___ cohesion of ____

Water has the highest cohesion of any non-metallic liquid

Ice Density

Water in its solid form floats!! Solid water is less dense than liquid water

Water is nicknamed?

Water is nicknamed "The Universal Solvent"

Water is the only substance on earth that?

Water is the only substance on earth that occurs naturally in solid, liquid, and gas forms.

Sweating

When the body gets hot and sweats, that heat excites some of the water molecules on my skin to the point that they break those hydrogen bonds and they evaporate away. And when they escape, they take that heat energy away with them, leaving me cooler.

A cool property that results from these hydrogen bonds is?

A high cohesion for water, which results in a high surface tension

Adhesion

Adhesion is the attraction between two unlike substances

Capillary Action

Capillary Action- Adhesion makes the water molecules attracted to the molecules in the "Capillary", while cohesion keeps drawing in other water molecules

Cavendish didn't believe in?

Chemical compounds

Cohesion

Cohesion is the attraction between two like substances

Cavendish called oxygen?

Dephlogisticated air

Due to the water molecules polarity....

Due to the water molecules polarity, all water molecules are attracted to one another

What is important about water?

HYDROGEN BONDS!!!

First person to recognize hydrogen gas as a distinct substance and to determine the composition of water ++++

Henry Cavendish, he also discovered the Composition of the Atmosphere and the Density of the Earth

Heat Capacity

How good water is at holding heat

Substances that dissolve in water?

Hydrophillic

Hydrophobic Substances

Hydrophobic substances lack charged poles, they are non-polar and do not dissolve in water because they are essentially being pushed out of the water by water's cohesive forces

Cavendish called Hydrogen?

Inflammable air