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 .

Chemistry deals with the identification of substance of which matter is composed. Chemistry investigates their properties and the ways in which interact, combine and change.

Physical and Chemical Properties;

Physical properties is when you can observe or measured something without changing it. You can observe their color and odor or you can measure there volume, density and mass.

Chemical Properties can only be observed during a chemical reaction. You can determine its flammability and re-activity.

Physical and Chemical Change;

Physical change is when your substance or object does not form a new substance or object. It does not combine. For example Ice cream and a ice cream cone they are combined but can be taken apart.

Chemical change is when one or more substances are changed into new substance that have new and different properties. For example when you melt a metal it turns into a new substance.

Elements, Compounds and Mixtures;

An element is building blocks of matter mad out of atoms, They contain only one type of atom.

A compound is a substance a formed when two or more elements chemically combine.

And a mixture is a combination of two or more different substance that is mixed but not combined.

A example of mixture would be a salad because you combine all type of things but you can easily separate them.

Law of conservation of mass;

The law of conservation tells you that matter cannot be created or destroyed. It can only be transferred form state to state.


Solution- A substance made as a result of mixing a solid and a liquid and the solid dissolves.

Element- Building blocks of matter made of atoms.

Atom- The basic block for all matter.

Periodic Table;

A periodic table is a chart with all the metals and the basic information. The periodic table is divided by groups and periods. The periodic table is tells you what type of metals they are.

Metals and Non-Metals;

Metals are also good conductors of electricity. Non-metals do not conduct heat or electricity very well.

Atomic Number;

The atomic is what sorts the metals but they do not only sort metals they also tell you how many protons and neutrons the metal has.

Atomic Mass;

The atomic mass tells you the weight of the metal.

Protons , Neutrons and Electrons;

These 3 things are what make up an atom. They are distributed among the outer shell.

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Earth History

Law of supervision;

The law of supervision is a key based on observations of natural history, Stating that the youngest fossils are on the top and the oldest fossils are at the bottom.

Index Fossils ;

A fossil that is useful for dating correlating the strata in which it is found.

Ex: Dinosaur fossil