Mid-year Review

Chemistry , Earth history, Infections Disease.

Chemistry -8.p.1- understand the proprieties of matter and changes that occur when matter interacts in an open or closed container.

A Physical Properties is a characteristic that can be observe without changing the composition of the substance.

examples of physical properties is color and shape and texture and smell and size and state or matter.

A Chemical Propertties is a characteristic that you can only observe by changing the identify of the substance.

Examples of chemical properties is flammability and reactivate and oxidation. Matter can't be created or destroyed but matter can be changed. Matter changes physical and Chemically.

A Physical Change is any change but not involving a change in the substances chemical identify.

Examples: of physical change

A Chemical Change: one or more substances and changing into new substance. Examples: a explosion of firework. mixing acid and a base.Baking a cake.milk going sour

Elements: Elements are arranged on the periodic table.

Compounds: Two or more atoms of different elements that are bonded together made of element is a specific ratio that is always the same has a chemical formula can only be separated chemically but not physically.

Mixtures: Mixture is a combination of 2 or more pure substance that are held together by physical forces and chemical.

Periodic table: Is a table that shows all of the elements arranged in order by the atomic number. They usually are in rows

Groups:

group 1 is alkali metals and group 2 is alkaline earth metals

group three though twelve is transition metals

Lanthanids and Actinids are placed on the bottom of the periodic table

Metals are placed in group 1 and 2. Non-metals are now in row 14 15 16 17. Metalloids are placed elements 5 and 14 and 32 and 33 and 51 and 51 and 85.

Atomic number: is the number of an elements. Atomic mass is the same number of protons and neutrons in the atom.

protons and the neutrons will stay the same.

EARTH HISTORY

The Law Of Superposition: Is a key axiom based of observations of natural history.

Index fossil: Is a fossil the it useful for dating and the correlating the strata in which it is found.

Ice core: Is an sample of ice that can tell you the past climate by holding carbon dioxide.

Geologic Time Scale: Is a system of chronological measurement that relates stratigraphy.

Relative Dating: The age of a rock compared to the age of rock layers

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

Half-Time: Is the time taken for the radioactivity of a specified isotope to fall to half its original value.

Radioactive Decay: is the spontaneous breakdown of an atomic nucleus resulting in the release of energy and matter from the nucleus.

Vocabulary: Geology

Relative Dating

Absolute Dating

Index fossil

Law Of Superposition

Ice Core

Infectious Diseases:

They are different types