1 / 10

Changes

Changes. Physical or chemical?. Physical Change. Put a can of cola in the freezer. The water in the cola turns to ice It pushes on the can and may explode. Cleaning up that mess is not so nice. Now ice seems different than water. But its true identity’s the same.

daktari
Download Presentation

Changes

An Image/Link below is provided (as is) to download presentation Download Policy: Content on the Website is provided to you AS IS for your information and personal use and may not be sold / licensed / shared on other websites without getting consent from its author. Content is provided to you AS IS for your information and personal use only. Download presentation by click this link. While downloading, if for some reason you are not able to download a presentation, the publisher may have deleted the file from their server. During download, if you can't get a presentation, the file might be deleted by the publisher.

E N D

Presentation Transcript

  1. Changes Physical or chemical?

  2. Physical Change • Put a can of cola in the freezer. The water in the cola turns to ice It pushes on the can and may explode. Cleaning up that mess is not so nice. Now ice seems different than water. But its true identity’s the same. What do you say when you see this kind of thing? You call it a Physical Change

  3. Physical Change During a physical change the matter is manipulated in shape, size or appearance however the atomic or molecular arrangement stays in tack. The identity of the object remains the same.

  4. Chemical Changes A CHEMICAL CHANGE ALWAYS RESULTS IN SOMETHING NEW BEING CREATED. Something NEW means you will have a different pure substance

  5. Chemical Changes There are 5 basic types of chemical changes • Definite Color change (not a blending) • Production of a gas • Absorption or Release of Heat • Production of Light • Formation of a Precipitate

  6. Chemical Change • Definite Color change (not a blending): Dramatic change in the color of a substance indicates a new substance is present. Examples: Iron rusting it changes from dull gray to an orange. Leaves changing. Lemon juice in Ice Tea.

  7. Chemical Change • Production of a gas: When there is a chemical change sometimes gas is released. This gas is the result of the chemical reaction and the chemical change. When you mix baking powder with vinegar a gas is let loose and it bubbles. That gas is the product of the baking soda and vinegar mixing.

  8. Chemical Change 3. Absorption or Release of Heat: Burning wood is a classic chemical change. When wood burns it becomes ash and it produces heat. This heat is a product produced during the chemical change. Types of Heat Reactions a. Exothermic – Release of energy. b. Endothermic – Absorption of energy.

  9. Chemical Change 4. Production of Light: Glow sticks are very common in showing that light is an indicator of a chemical change. Among other things, the lights from fireworks and the light from lightning bugs are also products from a chemical change.

  10. Chemical Change 5. Formation of a Precipitate : When two liquids combine chemically often there is a solid product that is released. When that solid is insoluble {unable to dissolve in solution} the solid will “fall out” of the solution. The solid is called the precipitate and it indicates that a chemical change has occurred.

More Related