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Ch 3 vocab
Campbell Reece Biology CH 3 Vocab
30
Biology
11th Grade
08/18/2011

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Term
acid precipitation
Definition
rain, snow, or fog that is more acidic than pH 5.2
Term
acid
Definition
a substance that increases the hydrogen ion concentration of a solution
Term
aqueous solution
Definition
a solution in which water is the solvent
Term
base
Definition
a substance that reduces the hydrogen ion concentration of a solution
Term
Buffer
Definition
a substance that consists of acid and base forms in a solution and that minimizes changes in pH when extraneous acids or bases are added to the solution
Term
calorie
Definition
the amount of heat energy required to raise the temperature of 1 gram of water by 1 degree celsius; also the amount of heat energy that 1 gram of water releases when it cools by 1 degree celsius
Term
Celsius
Definition
a temperature scale that measures the freezing point of water at 0 degrees and the boiling point of water at 100 degrees
Term
cohesion
Definition
the binding together of like molecules, often by hydrogen bonds
Term
colloid
Definition
a mixture made up of a liquid and particles that remain suspended rather than dissolved in that liquid, because of their large size
Term
evaporative cooling
Definition
the process in which the surface of an object becomes cooler during evaporation, owing to a change of the molecules with the greatest kinetic energy from the liquid to the gaseous state
Term
heat
Definition
the total amount of kinetic energy due to the random motion of atoms or molecules in a body of matter; also called thermal energy. this is the most random form of energy
Term
heat of vaporization
Definition
the quantity of heat a liquid must absorb for 1 gram of it to be converted from the liquid to the gaseous state
Term
hydration shell
Definition
the sphere of water molecules around a dissolved ion
Term
hydrogen ion
Definition
a single proton with a charge of 1+ from the dissociation of a water molecule H+
Term
hydronium ion
Definition
a water molecule that has an extra proton bound to it H3O-
Term
hydrophillic
Definition
having an affinity for water
Term
hydrophobic
Definition
having an aversion to water; tending to coalesce and form droplets in water
Term
hydroxide ion
Definition
a water molecule that has lost a proton
Term
kilocalorie
Definition
the amount of heat energy rquired to raise the temperature of 1 kilogram of water by one degree celsius; a thousand calories
Term
kinetic energy
Definition
the energy associated with the relative motion of objects. moving matter can perform work by imparting motion to other matter.
Term
mole
Definition
the number of grams of a substance that equals its molecular weight in daltons and contains Avogadro's number of molecules.
Term
molecular mass
Definition
the sum of the masses of all the atoms in a molecule; sometimes called molecular weight
Term
pH
Definition
a measure of hydrogen ion concentration equal to -log[H+] and ranging from 0 to 14
Term
polar molecule
Definition
a molecule with opposite charges on different ends of the molecule (such as water)
Term
solute
Definition
a substance that is dissolved in a solution
Term
solution
Definition
a liquid that is a homogeneous mixture of two or more substances
Term
solvent
Definition
the dissolving agent of a solution
Term
specific heat
Definition
the amount of heat the must be absorbed or lost for 1 gram of a substance to change its temperature by 1 degree celsius
Term
surface tension
Definition
a measure of how difficult it is to stretch or break the surface of a liquid.
Term
temperature
Definition
a measure of the intensity of heat in degrees, reflecting the average kinetic energy of the molecules.
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