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27.16: P

Difficulty Level: At Grade Created by: CK-12
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partial pressure
The contribution that gas makes to the total pressure when the gas is part of a mixture.
pascal (Pa)
The standard unit of pressure.
Pauli exclusion principle
States that no two electrons in an atom can have the same set of four quantum numbers.
A combination of amino acids in which the amino group of one amino acid has undergone a reaction with the carboxyl group of another amino acid.
peptide bond
the amide bond that occurs between the amino nitrogen of one amino acid and the carboxyl carbon of another amino acid
percent composition
The percent by mass of each element in a compound.
percent error
Absolute value of the error divided by the accepted value and multiplied by 100%.
percent yield
The ratio of the actual yield to the theoretical yield, expressed as a percentage.
Horizontal row of the periodic table.
periodic law
States that when elements are arranged in order of increasing atomic number, there is a periodic repetition of their chemical and physical properties
periodic table
Arrangement of the elements in order of their atomic numbers so that elements with similar properties appear in the same vertical column or group.
The negative logarithm of the hydrogen-ion concentration in a solution.
Any part of a sample that has a uniform composition and properties.
phase diagram
Graph which the conditions of temperature and pressure under which a substance exists in the solid, liquid, and gas.
A lipid that contains a phosphate group and is a major component of cell membranes.
photoelectric effect
Phenomenon that occurs when light shined onto a metal surface causes the ejection of electrons from that metal.
Particle of electromagnetic radiation that has zero mass and carries a quantum of energy.
physical change
Change to a sample of matter in which some properties of the material change, but the identity of the matter does not.
physical chemistry
Branch of chemistry that is the study of the both the macroscopic and the atomic properties and phenomena in chemical systems.
physical property
Characteristic of a substance that can be observed or measured without changing the identity of the substance.
pi bond (π)
A bond formed by the overlap of orbitals in a side-by-side fashion with the electron density concentrated above and below the plane of the nuclei of the bonding atoms.
The negative logarithm of the hydroxide-ion concentration in a solution.
polar covalent bond
A covalent bond in which the atoms have an unequal attraction for electrons and so the sharing is unequal.
polar molecule
A molecule in which one end of the molecule is slightly positive, while the other end is slightly negative.
polyatomic ion
Ion composed of more than one atom.
A large molecule formed of many smaller molecules covalently bonded in a repeating pattern.
A sequence of amino acids between ten and one hundred in length.
polyprotic acid
An acid that contains multiple ionizable hydrogens.
A complex carbohydrate polymer formed from the linkage of many monosaccharide monomers.
A particle with the same mass as an electron, but with a positive charge.
potential energy diagram
A diagram that shows the change in potential energy of a system as reactants are converted into products.
Solid product that forms from a reaction and settles out of a liquid mixture.
Measure of how close a series of measurements are to one another.
Applied force per unit area on a surface.
primary structure
The amino acid sequence of a protein.
principal quantum number
Indicates the principal or main energy level occupied by the electron, symbolized by the letter n.
Substance that is present at the end of a chemical reaction.
a peptide that is greater than one hundred amino acids in length
Positively charged subatomic particle present in all atoms.
pure chemistry
Chemistry that is concerned with a greater understanding of the theories behind how matter is changing in chemical reactions.

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    Date Created:
    Apr 20, 2012
    Last Modified:
    Sep 06, 2016
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