Particle Model and Changes that Matter Undergoes .pdf

SCIENCE 7  Sort Me Out! Categorize these materials. Juice Cellphone Water Sand Oxygen Carbon dioxide Questions: 1. How did you sort the materials? 2. What comes into your mind when you hear the words solid, liquid, and gas? 3. What do you think is the common thing between those...

SCIENCE 7  Sort Me Out! Categorize these materials. Juice Cellphone Water Sand Oxygen Carbon dioxide Questions: 1. How did you sort the materials? 2. What comes into your mind when you hear the words solid, liquid, and gas? 3. What do you think is the common thing between those things? 4. Do you agree that all those things take space and have mass? 5. What takes up spaces and has mass?  Matter (Particle Model and the Changes it undergoes)  Encounter Objectives 1 Explain the properties of solid, liquid, and gas; 2 Demonstrate a simple experiment that shows change of state; and 3 Promotes the responsible use of resources and materials.  Matter is anything that has mass and occupies space.  Matter is composed of small discrete particles that are constantly moving called atoms. Atoms and Molecules Atoms are the basic unit of matter. Molecules are formed when a chemical bond exists between two or more atoms. Phases of Matter  Matter Type Phase/State mercury element liquid rubbing alcohol mixture liquid aspirin compound solid air mixture gas cologne mixture liquid brass mixture solid  Solid has a definite shape and volume has a very close arrangement of particles to each other particles can only vibrate  Liquid has definite volume but takes the space of the container has a nonuniform arrangement of particles with reasonable spaces between them  Gas does not have a definite shape nor volume distance between particles is greater compared with their sizes  i v i a Tr When matter transforms from one phase to another by heating , the heat provides the molecules additional kinetic energy that allows them to move faster. Changes in Matter Physical change refers to the transformation of matter wherein the composition of matter does not change. Examples of Physical Change freezing of water into ice melting of ice cream Changes in Matter Chemical change refers to the transformation of matter wherein the composition is affected or altered thereby forming new substances. Examples of Chemical Change frying meat burning of wood Questions?  Let us apply! Materials: baking soda vinegar bottle funnel balloon tablespoon  Let us apply! Procedure: Use the funnel to add about 2-3 tablespoons of baking soda into the balloon. Pour about 1/4 cup of vinegar into the small bottle.  Let us apply! Carefully stretch the opening of the balloon over the neck of the bottle or flask. Ensure that the balloon is securely attached, but don’t let the baking soda fall into the vinegar yet.  Let us apply! Once the balloon is securely in place, lift the balloon so that the baking soda falls into the vinegar. Observe what happens as the reaction begins. Questions: What did you observe happening to the balloon once the baking soda was added to the vinegar? How did the size of the balloon change throughout the experiment? Why do you think this happened? What did you notice about the reaction between the baking soda and vinegar? Were there any signs that a chemical change was occurring?  Let us make meaning! During our science experiments, we usually have left over materials. Why do you think it is important to use the resources responsibly in scientific experiments? How can we minimize waste during these times? Generalization: One Liner Describe this encounter with one word.