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 properties are a characteristic that you can observe without changing the composition of a substance. Examples would color, shape, texture, smell, size-dependable properties, and state of matter.

Chemical properties are a characteristic that you can only observe by changing the identity of a substance. Examples would be flammability, re activity, oxidation, and toxicity.

Physical change and Chemical change

-Physical change is any change that does not involve a change in the substance's chemical identity. Examples would be wood chipper, ice cube, chair, and water.

Chemical change is any change in matter that results in the formation of a new chemical substance. Examples would be eggs, cake batter, taco, and wood/fire.

Elements, Compounds, and Mixtures

-Elements are the building blocks of matter made of atoms. Examples would be oxygen, titanium, nitrogen, sodium, hydrogen, and gold.

Compounds are a substance that is formed when two or more elements chemically combine. Examples would be H2O, C6H12O2, and Nacl.

Mixtures are a combination of two or more different substances that is mixed but not combined. There are two different mixtures Heterogeneous and Homogeneous. Examples of a heterogeneous mixture is a bowl of cereal , balsamic vinaigrette, dressing, sand, and trail mix. Examples of a homogeneous mixture is water, perfume, gum powder, and mouth wash.

Periodic Table

The periodic table is a table with periods and groups of elements. There are exactly 112 elements on the table. Groups are the vertical columns and Periods are the horizontal columns. Metalloids, Metals, and Non-Metals are on the right side of the periodic table. Each element has their own atomic number, Atomic mass, protons, neutrons, and electrons.

Law of super conservation of mass

It states that mass cannot be created or destroyed but it can change states.


  • compound
  • matter
  • solution
  • atom
  • mixture
  • element


The law of superposition states that younger rock layers are on top and older rock layers are on top.