<p> Chemical Properties KEY 2.3</p><p>Begin a 4 page foldable, entitled “Chemical Properties, 2.3”, Read pages 50-54, and “Chemical Properties” PowerPoint., and use Lab 2.3.1. </p><p>Tab 1: Chemical Properties, p 50-51/1. Define chemical property (Use the definition in the margin.) A CHEMICAL PROPERTY IS A PROPERTY OF MATTER THAT DESCRIBES A SUBSTANCE’S ABILITY TO PARTICIPATE IN CHEMICAL REACTIONS ; 2. Chemical properties describe matter based on ITS ABILITY TO CHANGE INTO NEW MATTER THAT HAS DIFFERENT PROPERTIES.</p><p>Tab 2: Flammability: A Chemical Property, p 50-51/ 1. Define flammability; FLAMMABILITY IS THE ABILITY OF A SUBSTANCE TO BURN 2. Draw a picture of a stick of wood. </p><p>3. Write down at least one physical property and one chemical property of that wood;. A PHYSICAL PROPERTY OF THIS PIECE OF WOOD IS THAT IT IS A TAN COLOR SHAPED LIKE A cylinder, angled at the ends. 4. Draw a picture of the wood after it goes through a chemical change (after it burns)- </p><p>5.Write down at least one physical property and one chemical property of the new substance;. A PHYSICAL PROPERTY OF THE ASHES IS THAT IT IS GREY IN COLOR AND IN SMALL FINE POWDER. A CHEMICAL PROPERTY IS THAT ASHES ARE NOT FLAMMABLE</p><p>Tab 3: Reactivity: A Chemical Property, p 50-51/ 1. Define reactivity; REACTIVITY IS THE ABILITY OF TWO OR MORE SUBSTANCES TO COMBINE AND FORM ONE OR MORE NEW SUBSTANCES. 2. Draw a picture of a piece of steel wool. (or a car.) </p><p>3. Write down at least one physical property (such as color or luster) and one chemical property of the steel wool (or the car.);. A PHYSICAL PROPERTY OF STEEL WOOL IS THAT IT IS THE COLOR GREY.</p><p>4. Draw a picture of the steel wool (or the car) after it goes through a chemical change –reacts with copper sulfate or oxygen;</p><p>5. .What is this new substance called: Write down at least one physical property and one chemical property of the new substance;. THE NEW SUBSTANCE IS RUST. A PHYSICAL PROPERTY OF RUST IS IT IS THE COLOR ORANGE. AND IT IS A FINE POWDER A CHEMICAL PROPERTY OF RUST IS THAT IT IS NOT REACTIVE TO WATER OR OXYGEN</p><p>Tab 4: Chemical Changes, p 52/1. Define chemical change; A CHEMICAL CHANGE IS A CHANGE THAT HAPPENS WHEN ONE OR MORE SUBSTANCES ARE CHANGED INTO NEW SUBSTANCES THAT HAVE NEW AND DIFFERENT PROPERTIES 2. List evidence of a chemical change, (use BOAST ‘N) YOU CAN USE THE WORD BOAST’N TO HELP YOU REMEMBER THE SIGNS OF CHEMICAL CHANGES: BUBBLES FORMED, ODOR CHANGED, ALTERED COLOR, SOLID FORMED FROM LIQUIDS, TEMPERATURE CHANGED, NEW SUBSTANCE WITH NEW PROPERTIES</p><p>3. Give an example of when bubbles may not be enough evidence that a chemical change happened; IF YOU JUST SHAKE OR OPEN A CAN OF POP, YOU MIGHT SEE BUBBLES, BUT THIS IS JUST CARBON DIOXIDE BEING RELEASED- IT WASN’T FROM A CHEMICAL REACTION. 4. How many pieces of evidence are needed to identify a change as a chemical change? YOU USUALLY NEED AT LEAST TWO PIECES OF EVIDENCE TO BE SURE A CHEMICAL CHANGE HAS OCURRED. Tab 5: Chemical vs Physical Changes, p 53-54/ 1. List and pictures of five physical changes (Be sure to include solubility and phase changes.); Dissolving, melting, crushing, shredding, slicing, evaporating </p><p>2. List and pictures of five chemical changes; </p><p>Bubbles odor light irreversible new color precipitate burning Produced changed or heat change substance changed formed produced 3. Explain what the most important question is to ask when determining whether a change is a physical or chemical change. THE MOST IMPORTANT QUESTION TO ASK IS, “DID THE COMPOSITION CHANGE?”</p>