October 27 - 30
students took quarterly exams
October 24
Review for quarterly
October 22 and 23, 2014
Nuclear chemistry
deals with the changes in the nucleus of the atom
radioisotope
isotopes that have unstable nuclei and undergo radioactive decay
radioactive decay
process in which an unstable nucleus emits radiation
radioactivity
the process in which a nucleus gives off alpha, beta or gamma radiation
radiation
the giving off of energy
alpha emission(radiation)
emission of an alpha particle (helium nuclus) from the nucleus of an atom.
Beta emission(radiation)
emission of a high speed electron, formed when a neutron decomposes into a proton, from the nucleus of an atom.
gamma emission(radiation)
emission of high energy electromagnetic radition from the nucleus of the atom.
October 20 and 21
isotope
atoms with the same number of protons but different numbers of neutrons
Percent Abundance
The amount of an isotope of an element found in nature expressed as a percentage of the
total amount of all isotopes of the element.
Atomic Mass
The weighted average of the masses of all the isotopes of an element
October 17 and 18
students took the third test of the quarter
students completed their percentage labs
Mixture
Combination of two or more substances that are not
chemically combined
Heterogeneous Mixture
A mixture that is
not uniform throughout. The components of the mixture can be distinguished.
Homogeneous Mixture
A mixture that is uniform
throughout. The components of the mixture cannot be distinguished.
A solution is a
homogeneous mixture.
October 2 and 3,2014
Students completed a density lab.
Percent error
a measurement of how inaccurate a measurement is
October 1, 2014
DENSITY
A PHYSICAL PROPERTY OF A SUBSTANCE THAT MEASURES THE RELATIONSHIP OF THE MASS OF THE SUBSTANCE TO IT'S VOLUME.
DENSITY=MASS/VOLUME GRAMS/ML
October 31
Half Life
Time required for one half of a sample of a radioisotope to decay.
October 29
Nuclear chemistry
deals with the changes in the nucleus of the atom
radioisotope
isotopes that have unstable nuclei and undergo radioactive decay
radioactive decay
process in which an unstable nucleus emits radiation
radioactivity
the process in which a nucleus gives off alpha, beta or gamma radiation
radiation
the giving off of energy
alpha emission(radiation)
emission of an alpha particle (helium nuclus) from the nucleus of an atom.
Beta emission(radiation)
emission of a high speed electron, formed when a neutron decomposes into a proton, from the nucleus of an atom.
gamma emission(radiation)
emission of high energy electromagnetic radition from the nucleus of the atom.