Summary of pg 34(2.6),36,38(2.9)

p.34 (2.6)
Compounds have a definite composition: Elements can't decomposed,compounds are the elements together. However ,not all combination of elements are combination. Hydrogen and oxygen gases produced when water is decomposed can be mixed together in any proportion, the result will be colorless,odorless gas like air. The difference between mixture of elements and compounds of elements: mixture of elements can have almost any composition desired and compounds will have definite composition, the experimental fact is called the Law of definite composition. Every compound has a definite composition, it is possible to make several compounds from the same elements. The fact that two or more compounds with different proportions of the same elements can be made is known as the Law of multiple proportions.

p.36
Macroscopic observations(macro means large;scopic means viewing or observing) is what you see,feel or smell .
Macroscopic properties are melting point, boiling point,heat of fusion ,temperature, and mass are all properties of large chunks of matter .
Atoms: the word atom means this smallest possible piece of something., they are normally spheres of various size and colors.

p.38(2.9)
Compounds: All compounds must be made of two or more kinds of atoms. Since compounds are made of two or more kinds of atoms,the different atoms can be separated if enough energy is supplied to break the compound apart. Heat and electricity are forms of energy ,and both heating and electrolysis can supply the energy to decompose the compound . Like elements ,compounds exist in 3 forms: Solid,Gas,Liquid. For example: when ice melts or water boils, the molecules come unstuck, but the atoms do not.

Here is a video of how atoms are made
http://www.youtube.com/watch?v=qmgE0w6E6ZI