2. Chemistry is concerned with the properties of chemicals and with the changes chemicals can undergo. Chemicals make up everything you see every day. A chemical is any substance that has a definite composition—it’s always made of the same stuff no matter where the chemical comes from. Everything you see, Including the clothes the girl is wearing and the food she is preparing, is made of chemicals. The girl is even made of chemicals! Even things you cannot see, such as air, are made up of chemicals. without.

3. You Depend on Chemicals Every Day

4. Top Eight Chemicals Made in the United States (by Weight) Rank NameFormulaUses 1Sulfuric acidH 2 SO 4 production of fertilizer; metal processing; petroleum refining 2EtheneC2H4C2H4 production of plastics; ripening of fruits 3PropyleneC3H6C3H6 production of plastics 4AmmoniaNH 3 production of fertilizer; refrigeration 5ChlorineCl 2 bleaching fabrics; purifying water; disinfectant 6Phosphoric acid (Anhydrous) P2O5P2O5 production of fertilizer; flavoring agent; rustproofing metals 7Sodium Hydroxide NaOHpetroleum refining; production of plastics 81,2- Dichloroethene C 2 H 2 Cl 2 solvent, particularly for rubber

5. Chemical Reactions Happen All Around You Cooking FoodTaking a Photograph Starting a Gasoline engineStriking a Match YOU

6. Go to http://my.hrw.comhttp://my.hrw.com Log in Select the online textbook Select chapter 1 (entire chapter) Select Visual Concepts View all of the Visual Concepts under section 1 What is Chemistry?

7. Chemical Reactions

8. The End Sharon Holloway