Presentation on theme: "Chapter 2. Learn about the composition of matter Learn the difference between elements and compounds Learn to distinguish between physical and chemical."— Presentation transcript:
Learn about the composition of matter Learn the difference between elements and compounds Learn to distinguish between physical and chemical properties and changes Learn to distinguish between mixtures and pure substances Learn to methods of separating mixtures
Can exist in three states – solid, liquid and gas Can be described in terms of its physical and chemical properties
Read Chapter 2 Answer the Focus questions at the end of selected Sections (pages 29 & 41)
Atoms – tiny particles that make up matter Elements are made of atoms No two elements are made of the same atoms Made of one type of atom Compounds are made of molecules that are made of two or more different atoms bonded together A specific compound consists of the same particles throughout Molecules are made of atoms that are “stuck” together bonded.CO 2 Always have the same composition same combination of atoms.
Describe a substance’s ability to undergo a change to a different substance
Are the characteristics a substance exhibits as long as no chemical change occurs.
Involves a change in one or more physical properties, but no change in composition. The most common physical changes are changes of state: solid liquid gas
Transforms a substance into a new substance or substances Involves a change in the fundamental components of the substance A given substance changes into a different substance or substances Are called reactions Ex. Silver tarnished by reacting with substances in the air Ex. A plant form a leaf by combining various substances from the air and soil
Has variable composition Homogeneous mixture (solution) Has the same properties throughout Ex. tea, sugar water, glass, alloys Heterogeneous mixture Does not have the same properties throughout Ex. granite, salt & pepper, Italian dressing
Two types Elements Which cannot be broken down chemically into simpler substances Composed of tiny particles called atoms. Each element has a characteristic type of atom. All elements are on the Periodic table of elements Compounds Which can be broken down chemically into elements Are composed of different types of atoms. Contain molecules particles that are composed of atoms bonded to one another Ex. Sugar, gasoline, baking soda, plastics
1.A multivitamin tablet 2.The blue liquid in your car’s windshield washer 3.A Spanish omelet 4.A diamond 5.Gasoline 6.A jar of jelly beans 7.Chunky peanut butter 8.Margarine
Go to classzone.com Click on science to find your book the state of Tennessee World of Chemistry Chapter 2 Flip through the flashcards Take Test 1 Bring results to class tomorrow.
CHEMISTRY World of Zumdahl Zumdahl DeCoste
1.Iron metal is melted. 2.Wood burns in air 3.A rock is broken into small pieces. 4.Milk turns sour. 5.Iron combines with oxygen to form rust. 6.The inside of an apple turns brown when exposed to air. 7.You make scrambled eggs. 8.You step on a piece of chalk and it becomes powdered. 9.You use a flashlight when the electricity goes out. 10.Steam from hour hot shower condenses on a cold mirror.
11.The boiling point of a certain alcohol is 78 0 C. 12.A diamond is very hard 13.Sugar ferments to form alcohol. 14.A gold wire can be flattened and used for foil 15.Gallium metal melts in your hand 16.Platinum does not react with oxygen at room temperature. 17.A dead tree gets chopped for firewood. 18.The copper sheets that form the “skin” of the Statue of Liberty have acquired a greenish coating over the years.