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Physical Properties and Changes

Physical Properties and Changes. Lindsey Peele. Ice Breaker. Directions: Turn to the next blank right side page in your interactive notebook. Restate and answer the following questions: 1.True or False: A compound is made up of two or more elements.

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Physical Properties and Changes

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  1. Physical Properties and Changes Lindsey Peele

  2. Ice Breaker • Directions: Turn to the next blank right side page in your interactive notebook. Restate and answer the following questions: • 1.True or False: A compound is made up of two or more elements. • 2. True or False: The properties of a compound are different from the properties of the elements that make it. • 3. If you could make a compound, what would you make? • After you complete these questions, discuss with your neighbor and write down their answers as well.

  3. You will know by the end of today…. • Physical and chemical properties can be used to identify substances • How to distinguish between physical properties and chemical properties

  4. Matter Matter can undergo physical and chemical changes Physical Changes: the chemical composition of the substances does not change. Chemical Changes: different substances are formed. Chemical Reaction- when a substance is broken apart or when substances are combined and at least one new substance is formed

  5. Fire- Chemical Reaction • http://app.discoveryeducation.com/techbook2:concept/view/guidConceptId/22cc81ed-8bd3-4b53-8964-18551be0242d/guidUnitId/1ef90b7b-c4ee-40d5-bcdc-ff4f708f8873#/tab=engage-tab&page=NaN&subTab= • Video: The Chemistry of Fire • Discovery Education

  6. Physical Properties • Can be observed and measured without changing the kind of matter being studied.

  7. Melting 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. • The melting point of a pure substance can be used as a physical property for identification. • Ice melts to form liquid water at 0 degrees Celsius or 32 degrees Fahrenheit.

  8. Boiling Point • The temperature at which a liquid boils. • During the process of boiling a substance changes from a liquid to a gas. • As long as the substance is boiling the temperature of the liquid remains constant (at the boiling point). • Boiling point is unchanging under constant conditions for a given substance and can be used as a physical property for identification of the substance. • The boiling point for pure water at sea level is 100degrees C or 212degrees F.

  9. Density • Density is a property that describes the relationship between the mass of a material and its volume. • Substances that have higher densities 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, the density of lead is much greater than the density of aluminum.

  10. 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.

  11. Physical Changes • Do not change the composition of a substances, only the physical properties.

  12. Chemical Properties • Chemical properties can also be used to help identify a substance. • 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. • A chemical property of one substance usually involves its ability to react or not react with another specific substance.

  13. Two examples of chemical properties: Reacting with Oxygen • The ability of a substance to burnis a chemical property that involves a substance reacting quickly with oxygen to produce light and heat. Reacting with oxygen slowly occurs when iron rusts or apples turn brown. Reacting with Acids • The ability of a substance to react with an acid is a chemical property. Some metals react with various acids to form compounds. • All metals do not react with all acids. Bases react with acids to form water and neutralize the acid.

  14. Tomorrow… • How to differentiate between physical and chemical changes….. • http://www.youtube.com/watch?v=gCbqjs-pqJo

  15. YouTube Video! • Shake • http://www.youtube.com/watch?v=oKXvcMIftt0 • Physical/Chemical Properties Rap • http://www.youtube.com/watch?v=EeWzyR1xap4

  16. Activity- Physical Changes Lab Stations • Station 1- Melting Ice- Melting Point • Station 2- Food Coloring in water- Color • Station 3- Empty soda can and empty tin can of beans –Density • Station 4/Computer- Show Boiling Point - Boiling water http://www.youtube.com/watch?v=0xcxumccf8Q

  17. Interactive Notebook • Answer the following questions FOR EACH STATION. • 1. Write your observations. • 2. Write materials used. • 3. Write process of physical change occurring (how the physical change occurs) • At the end of this activity, summarize your findings in a 2 paragraph essay.

  18. END

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