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Can you change your matter?

Can you change your matter?. Name one physical property of this bear. Review. Chemical Properties. The ability of a substance to undergo chemical reactions and form NEW substances Chemical Properties describe CHEMICAL CHANGES

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Can you change your matter?

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  1. Can you change your matter?

  2. Name one physical property of this bear. Review

  3. Chemical Properties The ability of a substance to undergo chemical reactions and form NEW substances Chemical Properties describe CHEMICAL CHANGES Example: burning a tree creates new substances (ash and smoke)

  4. Examples of Chemical Properties • Combustibility • Reactivity with oxygen, acid or water • Flammability

  5. Give an example of a chemical property. Review

  6. Study Buddy Review!! Classify each as a physical or chemical property of matter: • Blue Color • Ability to Rust • Density • Flammability • Reacts with a base to form water • Boiling Point • Reacts with water to form a gas • Luster • Mass • Odor

  7. Physical Change is a change that affects one or more physical properties of a substance. What could you do to this lemon to change it physically?

  8. How can you physically change the paper? • Crumble it. • Rip it. • Cut it.

  9. How can you physically change ice? • Cut it. • Melt it.

  10. Examples of Physical Changes • Freezing water into ice cubes • Sanding a piece of wood • Cutting your hair • Crushing an aluminum can • Bending a paperclip • Ironing your clothes

  11. What are chemical changes? A chemical change occurs when a substance changes into something new. This occurs due to heating, chemical reaction, etc.

  12. You can tell a chemical change has occurred if the density, melting point or freezing point of the original substance changes.

  13. Examples of Chemical Changes… Combustion Electrolysis Oxidation Tarnishing Reacting with oxygen, acid or water

  14. Evidence for Chemical Reactions… Color Change Precipitation Gas production Temperature changes Changes in properties

  15. Reaction with acids Reaction with bases (alkalis) Reaction with oxygen (combustion) Ability to act as oxidizing agent Ability to act as reducing agent Reaction with other elements Decomposition into simpler substances Corrosion Characteristics of Chemical Changes

  16. Discover Activity Obtain a small piece of chalk. Observe it and record its properties in your notebook. Place the chalk on a piece of paper and crush it with the back of a spoon. Record the changes that occurred in your notebook

  17. Discover Activity (Cont.) Place some of the crushed chalk into the bowl of the spoon. Add about 8 drops of vinegar. Record what happens in your notebook.

  18. Explanation Chalk is mostly a single substance, calcium carbonate. Do you think a new substance was formed when the chalk was crushed? Do you think a new substance was formed when vinegar was added? Provide evidence for your answers.

  19. Physical Changes Changes that alter the form or appearance of matter. Does not change the substances in the matter into new substances.

  20. Examples of Physical Changes… Changes in State When matter changes from a solid to a liquid or a liquid to a gas. Ice/water vapor/liquid water Dissolving Bending, crushing, breaking, chopping

  21. Check for understanding Why is the melting of an ice cube called a physical change? The substance is still water, just the form has changed.

  22. Chemical Change Occurs when a substance is transformed into a different substance. The newly formed substances have different properties than the original substances.

  23. Discover Activity Take a beaker and fill with 50 mL of water Drop 3 drops of red dye into the water Make observations. Is it a physical or chemical change? Which one is the Solvent? Solute?

  24. Cont. Discover Activity Now, add 5 drops of bleach to the solution of red colored water. Make observations. Is this a physical or chemical change? Explain.

  25. Let’s See What You Have Learned About the Properties of Matter…

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