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Biology Ch. 2
The Chemical Basis of Life
Terms in this set (32)
Anything that occupies space and has mass.
A substance that cannot be broken down to other substances by ordinary chemical means.
A substance containing two or more elements in a fixed ratio
Named from a Greek word meaning "indivisible," the smallest unit of matter that still retains the properties of an element.
Two neutrons and two protons tightly packed in the atom's central core.
Unique number of protons in an element, defines that element.
The sum of the protons and neutrons in its nucleus.
Atomic Mass (weight)
is approximately equal to its mass number, the sum of its protons and neutrons
certain energy levels at which at which electrons in an atom occur
an atom or molecule with an electrical charge resulting from a gain or loss of one or more electrons
synonym for an ionc compound
two atoms share one or more pairs of outer-shell electrons.
two or more atoms held together by a covalent bonds
a covalent bond in which two pairs of electrons are shared between two atoms
an atom's attraction for its electrons, including shared electrons
polar covalent bond
the unequal sharing of electrons
an unequal distribution of charges
a chemical bond consisting of a hydrogen atom between two electronegative atoms (e.g., oxygen or nitrogen) with one side be a covalent bond and the other being an ionic bond
a measure of how difficult it is to stretch or break the surface of a liquid
the amount of energy associated with the movement of atoms and molecules in a body of matter.
measures the intensity of heat-that is that average speed of molecules rather than the total amount of heat energy in a body matter
the dissolving agent
the substance that is dissolved
the solute when water is the solvent
a compound that donates hydrogen ions to solutions
a compound that accepts hydrogen ions and removes them from a solution
used to describe how acidic or basic a solution os (pH stand for potential hydrogen)
substances that resist changes in pH by accepting H⁺ when it is in excess and donating H⁺ when it is depleted.
rain, snow, or fog with a pH lower (more acidic) than 5.6
a process leading to changes in the composition of matter
the starting material in a chemical reaction
the resulting material in a chemical reaction
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