Biology - Properties of Water

Acid

A compound that forms hydrogen ions (H+) in solution

Base

A compound that forms hydroxide (OH-) ions in solution

Heat Capacity

The amount of energy needed to increase the temperature of a substance

specific heat

The amount of energy required to raise the temperature of 1 gram of a substance by 1 degree celcius

Hydrogen bond

The attraction between a hydrogen atom (with a partial positive charge) and another atom with a partial negative charge

H2O

The chemical formula for water

surface tension is a measure of what?

how hard it is to break the surface of a liquid

What keeps particles suspended?

water

pure water has a ph of

7

at sea level water freezes at

0 degrees celcius

Five properties of water

1.)Cohesion and Adhesion 2.)Surface tension 3.)High specific heat 4.)Density 5.)Universal Solvent

at sea level water boils at

100°C

Mixture

A material composed of two or more elements or compounds that are physically mixed together but are not chemically combined

Surface tension

A measure of how difficult it is to break the surface of a liquid and is caused by cohesion

pH scale

A measurement system that indicates the concentration of hydrogen ions (H+) in a solution

Suspension

A mixture of water and nondissolved material

Solution

A mixture where the components are evenly distributed throughout

Polar molecule

A molecule in which the positive and negative charges are unevenly distributed

Cohesion

A property of water in which the water moecules are attracted to one another

Adhesion

A property of water in which the water molecules are attracted to a substance other than water

Buffer

A weak acid or base that can react with a strong acid or base to prevent sudden changes in pH

Capillary action

The movement of a liquid along a surface and against the force of gravity and is due to both adhesion and cohesion

Solvent

The substance in which the solute dissolves

Solute

The substance that is dissolved in a solution