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 or closed container

Physical Property Physical Change and Chemical Properties Chemical Changes

Physical Properties: Odor, Mass, density, state, volume, color.

Physical Change: Does not form a new substance like ice cream and butter on bread.

Chemical Properties:These properties can only be observed during a chemical reaction flammability and reactivate.

Chemical Change:One or more substance are changed into new substances that have new and different properties.

Element: One type of atom can not be separated into similar substances by physical or chemical means.Located on the periodic table of elements.

Compounds: Are made up of two types.

Mixture: Combination of two or more pure substances that are held together by physical forces, not chemical.

Atoms: Smallest part of a element. Atoms are the basic building blocks of matter. Atoms are chemically joined together are called molecules.

Molecules: is formed when two or more atoms join together chemically. A compound is a molecule that contain at least two different elements.

Heterogeneous: You can see individual parts .

Homogeneous: Are the same throughout It is well mixed.

Solution: A substance made as a result of mixing a solid and liquid and they dissolves like Kool Aid.

Matter: Is anything that takes up Space the world is made of matter.

Groups: Columns elements that go up and down on the periodic table of elements.

Atomic Mass: The mass of an atom of a chemical element that is equivalent to the number of protons and neutrons in an atom.

Earth History

Law of Superposition: The geologic principle that state in horizontal layers of sedimentary rock.

Index fossil: Fossil of widely distributed organisms that lived during only one short period.

Ice core: Times in the past when continental glaciers covered large parts of earths surface.

Precambrian Era: 4.5 billion- million years ago.

Paleozoic Era: 570-245 million years ago.

Mesozoic Era: Million years ago.

Cenozoic Era: 70 million years ago present day.

Absolute Dating: The age of a rock given as the number of years since the rock formed.

Relative Dating: The age of the rock compared to the age or rock layers.

Half-life: The time taken for the radioactively of a specified isotope to fall its original value.

Radioactive Decay: Emitting or relating to the emission of ionizing radiation or particles

Infectious Diseases

Microorganisms: Many microorganisms cause a diseases.

Virus: Is too small to be seen by light microscope.Is able to multiply only with living cells.

Bactria: Bacteria constitute a large domain of prokaryotic microorganisms.

Fungi: Large group of eukaryotic organisms that includes microorganisms mushrooms are a part of the fungi group.

Parasite: An organisms that lives in or on an organism