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Just A Phase

Just A Phase. Phases of Matter Inquiry. Just a Phase - Inquiry. Properties of Matter – page 64 - 65 Read Introduction Getting Started – In your lab group, discuss all of the questions under #1 A – F Complete Getting Started – Read and complete Question #2. Background Information:

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Just A Phase

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  1. Just A Phase Phases of Matter Inquiry

  2. Just a Phase - Inquiry • Properties of Matter – page 64 - 65 • Read Introduction • Getting Started – In your lab group, discuss all of the questions under #1 A – F • Complete Getting Started – Read and complete Question #2.

  3. Background Information: • 1. Plasma is a fourth phase of matter. Plasma exists at high temperatures (such as those found in stars) and consists of ionized atoms. • Phase changes take place when molecules loose kinetic energy and come closer together (example: gases to liquids to solids) or gain kinetic energy and move farther apart (example: solids to liquids to gases). • Phase change is dependent on temperature and pressure (atm or air pressure determines at what temperature water will boil)

  4. Background Information continued: • The temperature of the substance, NOT the temperature of the surroundings determines whether a phase change takes place (example: snow or ice does not instantly turn to water when the temperature rises above 0⁰ C orthe water in your swimming pool does not instantly evaporate when it is over 100 ⁰ C in the summer). • An object must absorb heat energy to rise in temperature.

  5. Student Jobs • 1 – Measure the temperature • 1 – Monitor the time • 2 or 3 – Record the temperature and make observations. • Materials Required • Alcohol Burner • Burner Stand • Thermometer • 250 mL Beaker • 3 – 4 ice cubes • Water • Stopwatch

  6. Procedures: • Mrs. Joshu will demonstrate how to use the burner stand and alcohol burner to heat a liquid. Illustrate (in your lab book) how the assembled alcohol burner apparatus should look. • Pour cold tap water to a depth of 1 cm, into the bottom of the beaker. • Collect 3 or 4 ice cubes and add them to the beaker. • Place the thermometer in the ice water and allow it to stand for a few minutes. Keep the bulb of the thermometer in the water throughout the entire heating process.

  7. Procedures continued: • Take the temperature of the ice water before they start heating with the burner. This will be the temperature at time 0 in Table 1 on the student sheet. • As soon as the temperature has been taken, start heating the ice water with the burner (as shown in your illustration of the alcohol burner apparatus). • Take temperature readings every 30 seconds. Make notes in column 3 of the table of any observations considered to be relevant.

  8. Procedures continued: • Continue to heat the water, taking the temperature and recording observations for 3 minutes after it has started to boil. • When you have completed heating, extinguish the burner and allow the apparatus to cool for a minimum of 10 minutes. The beakers should then be emptied. • Important Safety Requirements • Tie back long hair. • Safety goggles must be worn. • Be careful handling hot apparatus!

  9. Still MORE Procedures: • All members of the group should have a complete record of the results. • Plot the results of your data on the Student Sheet 7.1. Make sure that you have everything labeled correctly. • Annotate the graph with observations (example: “all of the ice melted” or “the water started to boil”). • Turn to page 67 in the Properties of Matter Book. Answer questions 1 and 2 in the “Reflecting on What You’ve Done” Section.

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