Mid-Year Review

Chemistry, Earth History, Infectious Diseases, Lithosphere

Chemistry-8.P.1-Understand the properties of matter and changes that occur when matter interacts in an open and closed container

Physical Properties-Properties that can be observed through not changing an object.


Chemical Properties-Properties that can be observed through an object reacting to a stimuli.


Physical Change-A change that does not involve changing the object's chemical identity.


Chemical Change-A change that can not be reversed.


Compound-Substance where two or more elements chemically combine.


Mixture-Combination of two elements that are in the same place, but not combined.


Element-Made of one type of atom by itself.


Atom-Smallest form of matter.


Molecule-Formed when two or more atoms join together by chemical means.


Heterogeneous-Visible parts of a mixture.


Homogenous-A mixture that has it's contents invisible to the eye.


Matter-Everything that has mass and takes up space.


Solution-A substance made as a result of mixing a solid and liquid.


Atomic #-Equal to the number of protons and electrons.


Atomic Mass-The mass of an atom.


Protons-Positively charged particles in an atom.


Neutrons-Neutrally charged particles in an atom.


Electrons-Negatively charged particles in an atom.


Law of Conservation of Mass-A rule that states that if an experiment is done closed, there shouldn't be a loss of mass.


Periodic Table of Elements

Groups-A vertical column that categorizes elements that are similar.



Periods-Horizontal columns that group elements according to valance electrons.



Metals-Elements with metallic properties.



Metalloids-Elements that share the properties of metals and gases.



Non-Metals-Elements with no metallic properties.



Transition Metals-Elements found in the middle and that slowly transition into non-metals.

U.E.2-Understand the history of Earth and it's life forms based on evidence of change recorded in fossil records and land forms.

Law of Superposition-A rule that states that the older layers of rock will be found deep in the ground and will always stay that way unless an intrusion happens.


Index Fossils-Fossils that can be compared to indicate specific periods in time.


Ice Cores-Pieces of ice that contain the ancient gases of Earth millions of years ago.


Geologic Time Scale-A scale to show the different periods of time in Earth. Includes Precambrian Era, Paleozoic Era, Mesozoic Era, Cenozoic Era.


Relative Dating-Dating using the Law of Superposition, index fossils and Geologic Time Scale to find the relative age of a fossil.


Absolut Dating-Found when using carbon dating on a fossil.


Half-Life-The time it takes for half of the isotopes to decay.


Radioactive Decay-An that is unstable, thus gradually releases nitrogen isotopes.


Geology-The study of the history of Earth.


Fossil-Naturally preserved remains of an organism.


Uniformitarianism-Idea that processes that happen have always happened and continue to happen everywhere in the universe.


Index Fossils-Fossils that can be compared to help identify specific periods of time.


Fossil Record-A record of the total number of fossils that have been discovered.

Microorganisms-Microscopic organisms.


Viruses-Microorganisms that can not reproduce by themselves, so attack host cells; not really living, more like D.N.A. capsules.


Bacteria-