The Nature of Matter

1. The Nature of Matter

2. Standard • S8P1. Students will examine the scientific view of the nature of matter. • Distinguish between atoms and molecules. • Describe the difference between pure substances (elements and compounds) and mixtures. • Describe the movement of particles in solids, liquids, gases, and plasmas states. • Distinguish between physical and chemical properties of matter as physical (i.e., density, melting point, boiling point) or chemical (i.e., reactivity, combustibility). • Distinguish between changes in matter as physical (i.e., physical change) or chemical (development of a gas, formation of precipitate, and change in color). • Recognize that there are more than 100 elements and some have similar properties as shown on the Periodic Table of Elements. • Identify and demonstrate the Law of Conservation of Matter.

3. LIQUID PLASMA GAS SOLID Gases can fill a container of any size or shape. gases are really spread out and the atoms and molecules are full of energy. They are bouncing around constantly. Plasmas are made up of free electrons and ions of the element. You see plasma when you look at stars. Stars are big balls of gases at really high temperatures. Solids are usually hard because their molecules have been packed together. The closer the molecules are, the harder the solid is. Solids hold their own shape. Liquids will fill up the shape of a container. Water is a liquid. Your blood is a liquid. Liquids are an in-between state of matter. They can be found in between the solid and gas states.

4. Plasma is not a gas, liquid, or solid - it is the fourth state of matter. Plasma often behaves like a gas, except that it conducts electricity and is affected by magnetic fields. On an astronomical scale, plasma is common. The Sun is composed of plasma, fire is plasma, fluorescent and neon lights contain plasma. At least 85% of the universe is made up of plasma.

5. Physical changes between the states of matter can be produced by heating and cooling.

6. http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=30http://www.explorelearning.com/index.cfm?method=cResource.dspDetail&ResourceID=30

7. Once the ice has melted you have liquid water. (1-99°C) If you heat the water more it becomes steam, a gas. (0°C) • Let’s take a closer look with water. When water is frozen it is ice, a solid. (0°C) When ice is melting, it is heating up. Melted ice is a liquid. TEMPERATURE HIGH LOW

8. Lab 1: Melting Crayon • A crayon is melted and the results are observed • This activity may be conducted in various ways • Crayon shavings can be melted using aluminum foil and a tea light • A whole crayon can be melted using a pan and a Bunsen burner or a portable electric burner • By applying heat, the crayon goes from a solid to a liquid. Once the heat is removed or cooling is applied it returns to its original state, but not to its original shape.

9. Lab 2: Identify that state of matter! • Students must identify the state of matter in the mystery object • This activity could also be done in various ways • Shaving cream • Cornstarch and water

10. Lab 3: The Plasma Experiment • The students learn about plasma and experiment with the plasma globe • Materials • Plasma Globe • Fluorescent bulb

11. LIQUID PLASMA GAS SOLID Well separated with no regular arrangement. Vibrate and move freely at high speeds Has no definite volume or shape and is composed of electrical charged particles Tightly packed, in a regular pattern Sometimes vibrate, but do not move from place to place Close together with no regular arrangement. Vibrate, move about, and slide past each other

12. As more heat is applied, the atoms start to vibrate. The vibration increases as more heat is added to the system. Vibration turns into free movement as the heat gets higher and higher. When more heat is applied, the gas may be ionized: an electron will gain enough energy to escape its atom. This atom is left one electron short and now has a net positive charge; now it is called an ion. In a sufficiently heated gas, ionization happens many times, creating clouds of free electrons and ions; however, not all the atoms are necessarily ionized, and some may remain completely intact with no net charge. This ionized gas mixture, consisting of ions, electrons, and neutral atoms, is called plasma.

13. Nothing! It just changes states. The amount of matter does not change as a substance is heated or cooled. • This is called the conservation of matter. Matter is conserved or saved. It doesn’t disappear. • Let’s think back to our past experiments. Did the crayon disappear after it was melted and cooled?

14. Lab 4: Conservation of Matter • Students will learn that matter is conserved as it goes through physical changes. Materials • Mass balance • Styrofoam plate • Ice cube

15. References and Links • http://www.dac.neu.edu/physics/b.maheswaran/phy1121/data/ch04/anim/anim0402.htm (animations) • http://www.harcourtschool.com/activity/states_of_matter/molecules.swf (flash) • http://www.chem4kids.com/files/matter_plasma.html • http://www.chem4kids.com/files/matter_gas.html • http://www.chem4kids.com/files/matter_liquid.html • http://www.chem4kids.com/files/matter_solid.html • http://www.chem4kids.com/files/matter_changes.html • http://www.chem4kids.com/files/matter_states.html • http://www.chem4kids.com/files/matter_states.html • http://id.mind.net/~zona/mstm/physics/mechanics/energy/heatAndTemperature/changesOfPhase/changeOfState.html • http://www.bbc.co.uk/schools/scienceclips/ages/9_10/changing_state.shtml