Welcome to the epic cumulative wiki on Unit 5:  Chemistry, made by Eddy, Josh, Britney and Steven.  Here we have a FrontPage (you are looking at it right now), which basically includes a bunch of pictures and this summary, which has no other purpose but to take up space.  Next, we have a SideBar, which has links to all of the labs and assignments we have done throughout the year.  In this unit, we have learned how to identify and describe matter, learn how matter changes state, and the composition of atoms.  We also learned about the Periodic Table of Elements, which tells you a lot about every element.  Below are some images that are (mostly) relevant to the unit.  The standards covered in this unit are:

5. Chemical reactions are processes in which atoms are rearranged into different combinations of molecules.

As a basis for understanding this concept, students know:

a. reactant atoms and molecules interact to form products with different chemical properties.

b. the idea of atoms explains the conservation of matter: in chemical reactions the number of atoms stays the same no matter how they are arranged, so their total mass stays the same.

c. chemical reactions usually liberate heat or absorb heat.

d. physical processes include freezing and boiling, in which a material changes form with no chemical reaction.

e. how to determine whether a solution is acidic, basic or neutral.

Chemistry of Living Systems (Life Science)

6. Principles of chemistry underlie the functioning of biological systems.

As a basis for understanding this concept, students know:

a. carbon, because of its ability to combine in many ways with itself and other elements, has a central role in the chemistry of living organisms.

b. living organisms are made of molecules largely consisting of carbon, hydrogen, nitrogen, oxygen, phosphorus and sulfur.

c. living organisms have many different kinds of molecules including small ones such as water and salt, and very large ones such as carbohydrates, fats, proteins and DNA.

Periodic Table

7. The organization of the Periodic Table is based on the properties of the elements and reflects the structure of atoms.

As a basis for understanding this concept, students know:

a. how to identify regions corresponding to metals, nonmetals and inert gases.

b. elements are defined by the number of protons in the nucleus, which is called the atomic number. Different isotopes of an element have a different number of neutrons in the nucleus.

c. substances can be classified by their properties, including melting temperature, density, hardness, heat, and electrical conductivity.