Mid-Year review

Chemistry, Earth History, Infectious Diseases

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

-Physical; Can be observed or measured without changing it. Chemical; Describes matter based on its ability to change into new matter with different properties.

-Physical; One or more substances are changed into new substances that have new and different properties. Chemical; These properties can only be observed during a chemical reaction.

-Elements; Made of one type of atom, cannot be separated into simpler substances by physical or chemical means. Compounds; Are made of 2 or more atoms of different elements that bound together, made of elements in a specific ratio that is always the same, has a chemical formula. Mixtures; Combination of 2 or more pure substances that are held together by physical forces, not chemical.

-Periodic Table; Describes the parts of an atom and how we use these parts to identify elements on the periodic table.

*Groups; Columns of elements on the periodic table that share common properties. Periods; The periodic table has seven rows (horizontal) known as periods.

*Metals; Are on the left. Non-Metals; On the right. Metalloids; In the middle of the staircase line. (all on periodic table)

*Atomic Number; Electrons in an atom of one element. Atomic Mass; The sum of protons and neutrons in the nucleus of an atom Protons; Look at the atomic number to find them. Neutrons; Take the atomic number and round to nearest whole number. and Electrons; Look at the atomic number.

-Law of Conservation of Mass; transfers of matter and energy (both of which have mass)


Earth History

-Law of Superposition; Younger rocks lie above older rocks if the layer have not been disturbed.

-Index Fossils; Fossils of widely distributed organisms that lived during only one short period.

-Ice Cores; A piece of ice with different layers to describe how cold it was in certain times and at certain temperatures.

-Geologic Time Scale; A record of the geologic events and life forms in earths history.

-Relative; The age of a rock compared to the ages of rock layers. and Absolute Dating; The age of a rock given as the number of years since the rock formed.

-Half-Life/Radioactive Decay; Time it takes for 1/2 of the isotopes to decay.


Infectious Diseases


*Virus, Bacteria, Fungi, Parasite

-Epidemic; Small infection in a town or city. vs. Pandemic; World wide infection of a disease.

-Prevention/Treatment; Vaccines.

-Biotechnology; Living technology.


*Agriculture, Medicine, Economy