DAILY QUESTION September 8, 2008 1.How did you study for Quiz 1? 2.How long did you study?

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DAILY QUESTION September 8, How did you study for Quiz 1? 2.How long did you study?

Agenda9/8/08 Daily Question Hand back DQ Week 2 Handout Textbooks Chapter 2 Notes  Composition of Matter Assignments: 1. Enjoy Homecoming Coronation & Bonfire!

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Composition of Matter Atoms are matter. Everything in the universe is made up of matter. Matter is anything that has mass and takes up space Chemistry is the scientific study of the composition, structure, and properties of matter and the changes that matter undergoes. Element a substance that cannot be separated or broken down into simpler substances by chemical means Atom the smallest unit of an element that maintains the properties of that element Section 1 What Is Matter? Chapter 2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Elements in the Human Body Section 1 What Is Matter? Chapter 2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Composition of Matter, continued Elements combine chemically to form a compound. Compound a substance made of atoms of two or more different elements that are chemically combined Section 1 What Is Matter? Chapter 2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Composition of Matter, continued Compounds have unique properties. Every compound is different from the elements it contains. When elements combine to form a specific compound, they always combine in the same proportions. Section 1 What Is Matter? Chapter 2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Composition of Matter, continued A molecule acts as a unit. Atoms can join together to make millions of molecules. Molecules are the smallest unit of a substance that keeps all all of the physical and chemical properties of that substance. Section 1 What Is Matter? Chapter 2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Molecule Section 1 What Is Matter? Chapter 2

Copyright © by Holt, Rinehart and Winston. All rights reserved. ResourcesChapter menu Composition of Matter, continued Chemical formulas represent compounds and molecules. A chemical formula shows how many atoms of each element are in a unit of a substance. Chemical formula a combination of chemical symbols and numbers to represent a substance. Section 1 What Is Matter? Chapter 2