Biology 2.2

Solution

All components of a ______________ are evenly distributed throughout the solution.

Acid

Any compound that forms H+ ions in solution.

PH scale

Chemists devised a measurement system called the _________ to indicate the concentration of H+ ions in solution.

Solute

In a saltwater solution, table salt is the ________ substance that is dissolved.

Suspensions

Mixture of water and non-dissolved materials.

Solvent

Water is the _____________substance in which the solute dissolves

why are water molecules polar

a water molecule is polar because there is an uneven distribution of electrons between the oxygen an hydrogen atoms

What is the difference between a solution and a suspension?

all component are evenly distributed throughout a solution. mixtures of water and nondissolved materials are known as suspension.

Buffer

are weak acids or bases that can react with strong acids or bases to prevent sharp, sudden changes in ph.

What are acidic solutions

contain higher concentration of h+ ions that pure water and have ph values below 7

compare in terms acidic and basis solutions in terms of their H+ ion and OH- ion concertrations

higher concentration of h+ ion than pure water and have ph values below 7 solution lower concentration of h+ ions than pure water and have ph values above 7

Bases

is a compound that produces hydroxide ion (OH ions) in solution.

Mixture

is a material composed of two or more elements or compounds.

Adhesion

is an attraction between molecules of different substances.

Cohesion

is an attraction between molecules of the same substance.

What does PH measure?

measures the concentration of h+ ions in solution measures the concentration of h+ ions in solution

what are basic solutions

solutions contain lower concentrations of h+ ion than pure water and have ph values above 7

Use the structure of a water molecule to explain why it is polar

there is an uneven distribution of electrons between the oxygen and hydrogen atoms