3. Matter Pure Substances Mixtures Elements Compounds Homogeneous Heterogeneous He, O H 2 O, NaCl Tea, kool-aid Rocky Road ice cream, muddy water REMEMBER THIS ? This system allows us to classify matter into general types.
4. PROPERTIES OF MATTER are sets of characteristics by which a substance is recognized. However, we can also describe matter by its chemical and physical properties , referred to generally as properties of matter . How can we recognize physical properties? Physical properties are those that we can determine without changing the identity of the substance we are studying.
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6. Changing from solid to liquid to gas does not change the composition of water. It is still H 2 O. MORE CLUES ON PHYSICAL PROPERTIES Breaking the object changes the mass, volume and shape. But the basic composition is still the same. The spoons ability to bend without breaking, called malleability, is a physical property. Despite a change in its shape, the spoon is still a spoon, although admittedly not as useful.
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9. Density Shortcut M D V ass ensity olume D = M V M = D x V V = M D If you need mass, the triangle method shows that to solve you multiply D x V. If you need density, what is left is m/v If you need volume, what is left is m/D
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17. EXPLAIN THIS! Image courtesy of Texarkana Science Club, Texas A&M University Regular coke is made with sugar, diet coke has a sugar substitute which is far less dense than sugar. The result is that diet coke is less dense than water and floats. At your next family reunion dig down in the cooler…you’ll find that coke at the bottom.
18. How can we recognize chemical properties? Example: Hydrogen has the potential to ignite and explode, as it did here with the Hindenburg. http:// www.americanrhetoric.com/speeches/hindenburgcrash.htm Chemical properties describe the way a substance can change or react to form other substances.
19. More clues on chemical properties Rusting is a chemical property. In the presence of oxygen and with a little help from moisture, metals rust. Layer by layer the metal atoms combine with oxygen to form a brand new substance. Flammability is a chemical property. Childrens toys, clothing, and bedding are all items that have special guidelines that manufacturers must follow concerning the flammability of their materials.
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