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 and Chemical Properties- Physical properties can be observed or measured with out being changed. These include density, state of matter, odor, volume, mass, and color. Chemical properties can only be observed during a chemical reaction. These include flammability, reactivity, and formation of rust.

Physical and Chemical Change- A physical change does not form new substance. An example of a physical change would be ice cream melting because of the sun, the ice cream is still ice cream but it is in another state of matter. A chemical change is when one or more substances are changed into new substances that have new and different properties. An example of a chemical change would be the burning of wood, because you cant change the ashes back into wood.

Elements, Compounds, and Mixtures- Elements are the basic building blocks for matter that are made up of atoms. An example of an element is carbon. A compound is a substance formed when two or more elements chemically combine. An example of a compound would be H2O or water. A mixture is a combination of two or more different substances that are mixed but not combined. An example of a mixture is a bowl of cereal.

Periodic Table:

Groups and periods- A group on the periodic table is a vertical column of elements. A period on the periodic table is a horizontal row of elements

Metals, Non-Metals, and Metalloids-

EARTH HISTORY- 8.E.2- Understand the history of Earth and its life forms based on evidence of change recorded in fossil records and land forms.

Law of Superposition- A sequence of sedimentary rock layers each layer of rock is older than the layer above it and younger than the rock layer below it.

Index Fossils- Fossils used to define and identify geologic periods

Ice Cores- Ice that can be used to show a climate record

Geologic Time Scale: Describes the timing and relationships between events that have occurred throughout Earth's history

Relative and Absolute Dating: Relative dating is the act of determining the relative order of past events. Absolute dating is the act of determining the absolute age of past events

Half Life/ Radioactive Decay-