vocab
protective barrier of lipids and secretions on the surface of the skin.
Acid mantle
3 states of matter
sold, liquid and gas
what does pH stand for?
potential hydrogen
define solvent.
a substance that dissolves the solute to form a solution
a uniform mixture of two miscible substances
solution
substances that have a pH below 7.0
acid
give examples of physical properties.
color, smell, density.
what number means neutral on the pH scale?
7
two branches of chemistry
organic and inorganic
what is the difference between miscible and immiscible?
miscible- mixable
immiscible- does not mix
science that deals with composition, structure and properties of matter.
chemistry
define a elemental and a compound molecule.
elemental: molecule with 2 or more of the same element.
compound: molecule with 2 or more of a different element.
the addition of oxygen or the loss of oxygen
oxidation
any substance that occupies space
matter
give an example of a suspension
oil and vinegar, salad dressing.
the simplest form of matter
elements
what is an atom?
particle which matter is composed
colorless, odorless, tasteless gas, and the lightest element known.
hydrogen
can be determined without a chemical reaction
physical properties
surfactants have two ends, what are they?
lipophilic tail, hyrdophilic head,
unstable molecules that cause inflammation, disease, and biochemical reactions.
Free Radicals
matter that has an indefinite shape and volume.
gas
the most abundant element found on earth
oxygen
colorless, gaseous element that makes up about 4/5ths of the air in our atmosphere.
nitrogen
an unstable mixture of two or more immiscible substances
suspension