Page 0: Page 1: Chapter 2: Properties of Matter Section 1 Page 2: Chapter 2 Opening Demonstration  How are these two cans alike and different?  If we put these two drinks in water would they float or sink???  Let’s Try! Page 3: Who is Right??  This will work for any regular and diet drink! Page 4: Objectives Describe physical & chemical properties. Give examples of physical changes. Explain that chemical changes form new substances. Observe signs of chemical changes in an experiment. Page 5: Physical Properties We use physical properties to describe an object or a person! How would you describe these objects? Page 6: Matter has observable properties Physical Properties the characteristics of a substance that can be observed without changing the identity of the substance. Your senses can be used to detect physical properties. Examples: Color, shape, size, texture, volume, mass. Page 7: How do you know which characteristics are physical properties? Just ask yourself whether observing the property involves changing the substance to a different substance. Page 8: Density Mass & Volume are two physical properties Density is a measure of the amount of matter present in a given volume of a substance. Density= Mass D= m Volume V Page 9: Can you Determine??? How would you find the density of 200 g of clay with a volume of 100 cm3. Density is a property of a substance that remains the same no matter how much of a substance you have! Page 10: Density A glass marble has a volume of 5 cm3 and a mass of 13 g. What is the density of glass? Answer: D= 2.6 g/cm3 Page 11: Physical Changes A change in any physical property of a substance, not in the substance itself.\ Examples: Stretching a Rubber Band Ice melting Page 12: Chemical Properties Page 13: Up your nose…. Page 14: Why is Lady Liberty’s nose so shiny? It needs to be powdered? NO! When Tori and Alex rub her nose, the oils on their skin remove the tarnish (a chemical reaction); revealing the untarnished alloy. Olis from their hands also protect the alloy from reacting with the air and forming more tarnish. Do you think they pulled out an alloy booger? Page 15: Chemical Properties Chemical Properties describe how substances can form new substances. Examples: Combustibility Iron Rusting Silver Tarnishing Cooking (boiling Eggs) The only true indication of a chemical change is that a new substance has been formed. Page 16: Signs of a Chemical Change You may or may not be able to observe many chemical changes. If you observe 2 or more of these signs during a change, you are most likely observing a chemical change. Production of an Odor Change in Temperature Change in Color Formation of Bubbles Formation of a Solid Page 17: Formation of an Odor Some chemical changes produce smells. The chemical change that occurs when an egg is rotting produces the smell of sulfur. Thunderstorms also produce an odor. The odor is an indication that lightning has caused a chemical change in the air. Page 18: Lightning storm over Iraq~ Oct 07 Page 19: Lightning over Camp Adder in Iraq Page 20: “God must hate this place as much as we do…” Captain Jason deFoor Page 21: Change in Temperature Chemical changes often are accompanied by a change in temperature. Example: Logs burning in a campfire Page 22: Change in Color A change in color is often an indicator of a chemical change. Example: Fruit may change color when it ripens. Page 23: Formation of Bubbles  The formation of gas bubbles is another indicator that a chemical change may have occurred.  Example: Antacid tablet in water Page 24: Formation of a Solid  When two liquids combine, a solid called a precipitate can form.  Examples: Shells of animals such as clams and mussels are precipitates. They are the result of a chemical change involving substances combining with substances from the creatures. Page 25: Review What is a Physical Change? Give an example. What is a Chemical Change? Give an example. What is density? What is the formula? What are the signs of a Chemical Change? Page 26: