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.