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Lesson 2 – Changes of State Learning Objectives: 1.Recall that heating or cooling is involved in changes of state. 2.Recall the names of different changes.

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Presentation on theme: "Lesson 2 – Changes of State Learning Objectives: 1.Recall that heating or cooling is involved in changes of state. 2.Recall the names of different changes."— Presentation transcript:

1 Lesson 2 – Changes of State Learning Objectives: 1.Recall that heating or cooling is involved in changes of state. 2.Recall the names of different changes of state 3.Describe the particle model of solids, liquids, and gases. 4.Explain how energy is involved in changes of state.

2 Video https://www.brainpop.com/science/matterandchemistry/matterchan gingstates/ https://www.brainpop.com/science/matterandchemistry/matterchan gingstates/

3 Particle Theory Particle theory = idea that everything is made of particles Draw the particle model of solids, liquids, and gases.

4 Particle Theory Describe the motion of particles in solids, liquids, and gases. Solids vibrate in place. Liquids move and slide past each other. Gases more quickly and bounce around in all directions.

5 Energy How do you add more energy to matter? What happens to the particles when energy is added? What happens when matter changes state? Heating an energy adds thermal energy. When particles have more energy they move around faster. If enough energy is added, the particles move so fast that they move apart from each other and change state.

6 Changes of State Label the changes of state. Melting Boil/Evaporate FreezingCondensing

7 Melting point = the temperature at which a substance melts (turns from a solid into a liquid) Freezing point = the temperature at which a substance freezes (turns from a liquid to a solid The melting point and freezing point are actually the same! Boiling point = the temperature at which a substance boils (rapidly turns from a liquid to a gas) Freezing Point / Melting Point of Water Boiling Point of Water

8 Heating Curve We are going to investigate what happens to the temperature of water when ice is heated all the way to boiling.

9

10 Graphing a Heating Curve TimeTemperature (s)(°C) 03 303 608 9016 12024 15032 18043 21053 24062 27070 30078 33086 36090 39096 42097 45097 48097 Include: Title X-axis Label (independent variable) X-axis Units Y-axis Label (independent variable) Y-axis Units Pencil and Ruler Appropriate Scale (takes up at least ½ page) Line (curve) of Best Fit Points Accurately Plotted

11 melting  freezing  solid  liquid boiling  condensing  liquid  gas temperature time solid liquid gas Changes of state – heating curve

12 temperature time solid liquid gas Melting Point? Boiling Point? Melting Point Boiling Point

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