Acids/Basis and Water Water, water every where and not a drop to drink.

Water Water is vital for life. We need it for our cells to be able to carry out certain reactions. We need it for cells to maintain their shape. We need it to carry nutrients through out our body. WE NEED IT.

Water H 2 O = Water Water has a funny shape.

Water Because of it’s shape water is a polar substance. The Hydrogens are slightly positively charged and the oxygen's are slightly negatively charged. This polarity allows water molecules to bond via hydrogen bonding.

Water Polar substances are Hydrophilic (water- loving). – Salt (NaCl) Non polar substances are hydrophobic (water- dreading) Lipids (fats)

Water Because of it’s polarity water has three properties that very important. Temperature Stabilization (Specific Heat) Cohesion and Adhesion The Capacity to dissolve substances.

Specific Heat Specific Heat is the amount of energy needed to raise 1 gram of a substance 1 degree Celsius. Water will not vibrate very fast until the hydrogen bonds are broken. So water can take a lot of heat before actually heating up itself.

Water Water molecules like to stick together. The hydrogen bonds between molecules do not like to separate meaning that molecules will cling together. This is called Cohesion

Water Water molecules also like to stick to other polar surfaces. This is called Adhesion. Water can form a layer around certain organic molecules like proteins and act as a protective shield. This is called a hydration layer.

Water Water dissolves ions and other polar molecules. When salt is dumped into water the positive ends of water cluster around the negative ion (chloride) with their negative ends pointing out and other water molecules negative ends cluster around the positive ion (sodium). This creates a barrier between the two ions.

Water When dissolving substances it is important to know which chemical is the solute and which chemical is the solvent. Solute = it the solid being dissolved. Solvent = the substance doing the dissolving.