Changes in Matter Chapter 2 Section 2

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Presentation transcript:

Changes in Matter Chapter 2 Section 2 Students know that compounds are formed by combining two or more different elements and that compounds have properties that are different from their constituent elements. Chapter 2 Section 2

Match the Key Terms

All Matter. . .

Physical Change Physical Change: Any change that alters the appearance of matter but DOES NOT make a different substance. Examples: Changing the state of matter  solid, liquid, gas Changes in shape or form  dissolving, blending, crushing, chopping, breaking

What happened?

Chemical Change Chemical Change: A change in matter that produces NEW SUBSTANCES with properties different from those of the original substances. Bubbles are a sign of a chemical change …production of Carbon Dioxide Examples: Combustion  burning of wood, natural gas Oxidation  Rusting of iron Tarnishing  Tarnish on silverware

What happened?

Chemical vs. Physical Change

What happens to a substance in a physical change? It changes form or appearance Is dissolving sugar a physical change? Yes, if the water dries up, the sugar remains. How does a chemical change differ from a physical change? Chemical change produces new substances different from those of the original substances. When natural gas (methane) combusts, what are the substances that combine? Is this a physical or chemical change? Methane mixes oxygen from the air. Creates CO2 & water. Chemical Change!

Law of Conservation of Matter Matter is never created or destroyed…it is simply changed. Atoms are not lost or gained, just rearranged.

Chemical vs. Physical Slides! Your job is to create two whiteboard slides. One slide should be all about physical changes Include at least 5 examples with pictures and descriptions Include the definition of a physical change Include the definition of a physical property One slide should be all about chemical changes Include the definition of a chemical change Include the definition of a chemical property Use the whiteboard, powerpoint, or open office. You will present your whiteboards!