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 Properties: Can be observed or measured without changing it.

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

Physical Change: Does not form a new substance.

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

Elements:made of one type of atom cannot be separated into simpler substance by physical or chemical means. located on the periodic table.

Compounds: Are made of 2 or more atoms of different elements that are bonded together and can only be separated by chemical means, not physically.

Mixtures: Combination of 2 or more pure substance that are held together by physical forces, not chemical.

Periodic Table: It is organized by increasing the atomic number.the periodic table: metals and nonmetals.A small group whose members touch the zigzag line are called metalloids because they have metallic and nonmetallic properties. the table is also arranged in vertical columns called "groups" or "families" and horizontal rows are called "periods"