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 conatiner

-Physical and chemical properties

Physical properties are those that can be observed without changing the identity of

the substance.

-Physical and chemical changes

A chemical change is a result from a chemical reaction and make a new substance.

Physical change

A physical change is not a change in which the form of matter is altered but one substance is not transformed into another.

-Elements, compounds, and mixtures

Element~Is a substance that cannot be broken down by chemical means.

Compounds~Is a chemical species that is formed when 2 or more atoms are joined together chemically covalent, or ionic bonds.

Mixtures~2 or more substances which have been combined such that each retains it's own chemical identities.

-Periodic Table

*Groups and Periods

*Metals and Non-Metals

*Atomic Number, Atomic Mass, Protons, Neutrons, and Electrons

-Law of Conservation Of Mass

The LCM is that any system closed for all transfers of matter and energy the mass of the system must remain constant over time, as system mass cannot change quantity if it is nit added or removed.


Earth History

-Law of Superposition

The geologic principle that states in horizontal layers of sedimentary rock, each layer is

older that the layer above and younger than the one below it.

-Index Fossils

Fossils widely distributed organisms that lived during only one short period.

-Ice Cores

Times in the past when continental glaciers covered large parts of earth's surface.

-Geologic Time Scale

Is a system of chronological measurement that relates stratigraphy to time.

-Relative and Absolute Dating

The age of rock compared to the ages of the rock layers.

-Half-Life/Radioactive Decay

Time taken out for the radioactivity specified isotope ti fall to half of it's original value.


Infectious Diseases


*Virus, Bacteria, Fungi, Parasite

-Epidemic vs. Pandemic

Epidemic~widespread of an infectious disease in a community.

Pandemic~Wide spread of a disease over a the whole world or country.


Wash hands before doing anything especially when eating food.


The study of living organisms , divided into specialized fields that can cover their morphology, physiology, anatomy, behavior, origin and distribution.


*Agriculture, Medicine, Economy