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Alike or different? How do you know?

9. 27 .11 M. James. Alike or different? How do you know?. Agenda . Std: 7-5.9 Compare physical properties of matter (including melting or boiling point, density, and color) to the chemical property of reactivity with a certain substance (including the ability to burn or to rust.

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Alike or different? How do you know?

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  1. 9. 27.11 M. James Alike or different? How do you know?

  2. Agenda • Std: 7-5.9 Compare physical properties of matter (including melting or boiling point, density, and color) to the chemical property of reactivity with a certain substance (including the ability to burn or to rust. • Objective: Compare physical and chemical properties of a substance by making a foldable. • Bell ringer: Can you always identify a substance by how it looks? Why/why not? • Construct booklet • Insert notes • Discuss properties • Reflection: Can you always identify a substance by how it looks? Why/why not?

  3. Agenda, September 29, 2011 • Std: 7-5.9 Compare physical properties of matter (including melting or boiling point, density, and color) to the chemical property of reactivity with a certain substance (including the ability to burn or to rust. • Objective: Compare physical and chemical properties of a substance by making a foldable. • Bell ringer: without mentioning a name describe one of your friends. • Prep booklets • Insert notes • Discuss properties • Reflection: Why is what you see not always what you get?

  4. heading Front cover Physical and chemical properties

  5. Matter has ________ and takes up ________. Examples of matter are: __________________________________________________________________________ Draw one ex of matter. Matter? P. 1

  6. Matter has __mass_ and takes up _space_. Examples of matter are: (should have 7 or more) __________________________________________________________________________ Draw one ex of matter. Matter? P. 1

  7. p. 2 Pure substances Mixtures • _____________-- is a pure substance made of only one type of atom. An ex is __________________. • _____________-- is a pure substance made of 2 or more elements chemically joined in a certain ratio. An ex is _______ All matter is divided into 2 categories

  8. p. 3 Pure substances Mixtures • _an element_-- is a pure substance made of only one type of atom. An ex is __hydrogen, oxygen, iron, etc__. • _A compound_-- is a pure substance made of 2 or more elements chemically joined in a certain ratio. An ex is _water • A Mixture has no certain ratio or proportion. • Ex are iced tea, lemonade, Chex mix, milk, soda • Draw one: All matter is divided into 2 categories

  9. p. 4 • physical and chemical properties can be used to identify substances. Physical Chemical • Physical propertiescan be observed and measured without changing the kind of matter being studied. • Ex are • Melting point • Boiling point • Density • color • Chemical properties can be recognized only when substances react or do not react chemically with one another, that is, when they undergo a change in composition. • ex are • Rusting • burning Properties of matter

  10. p. 5 Melting point Boiling Point • The temperature at which a solid can change to a liquid. • The temperature at which a pure substance melts is unchanging under constant conditions. • Therefore, the melting point of a pure substance can be used as a physical property for identification. • Ice melts to form __________ at 00C or 32oF. • The temperature at which a liquid boils. • During the process of boiling a substances changes from a liquid to a gas. • Boiling begins when the liquid starts to form bubbles throughout, which grow larger, rise to the surface, and burst. • As long as the substance is boiling the temperature of the liquid remains constant (at the boiling point). • The boiling point for pure water at sea level is ________ or 212oF. Changes of state

  11. p.6 Density • Density is a property that describes the relationship between the mass of a material and its volume. • Density=Mass/volume • Substances that are denser contain more matter in a given volume. • The density of a substance will stay the same no matter how large or small the sample of the substance, and therefore, density can be used as a physical property for identification of the substance. • For example, lead is a very heavy, dense metal. The density of lead is much greater than the density of the very light metal aluminum.

  12. p. 7 Color • Color can be used to help identify a substance, along with other properties. • By itself color is not a significant identifier of a substance. • Absence of color is also a physical property. • What could you use for a picture of color in your foldable?

  13. p.8 gas SOLID liquid • Characteristics • Characteristics • Characteristics States of matter

  14. Can you always identify a substance by how it looks? Why/why not? Reflection:

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