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Freezing/Melting and Boiling Points

Freezing/Melting and Boiling Points. Spacing of Molecules in a Solid, Liquid, & Gas. Use this link http://www.chem.purdue.edu/gchelp/liquids/character.html. cools. rain. snow. Freezing/Melting Point. What is freezing point? It is the temperature at which a liquid becomes a solid. warms.

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Freezing/Melting and Boiling Points

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  1. Freezing/Melting and Boiling Points

  2. Spacing of Molecules in a Solid, Liquid, & Gas • Use this link http://www.chem.purdue.edu/gchelp/liquids/character.html

  3. cools rain snow Freezing/Melting Point • What is freezing point? • It is the temperature at which a liquid becomes a solid

  4. warms rain snow Freezing/Melting Point • What is melting point? • It is the temperature at which a solid becomes a liquid

  5. Freezing/Melting Point • What is the unit of measurement that scientists use for temperature? • Celsius • What is the temperature at which a WATER (liquid) becomes a solid (ice or snow)?

  6. Freezing/Melting Point • What is the temperature at which a WATER (liquid) becomes a solid (ice or snow)? • 0o degrees Celsius

  7. Freezing/Melting Point • If the temperature warms up 1 degree above 0o Celsius – what happens? • The ice or snow will melt • Or change from a solid to a liquid

  8. Freezing Point 0 Water freezes at ____ degrees Celsius • On your handout, use a marker to color in the temperature at which water freezes or becomes a solid (ice or snow) on the “Freezing Point” thermometer Water is a liquid that changes to a solid when it freezes.

  9. Gas Boiling Point • What is a boiling point? • It is the temperature at which a liquid becomes a gas.

  10. Boiling Point • What is the boiling point of water? • Does water continue to get hotter the longer you let it boil? • Let’s try it & see • http://www.youtube.com/watch?v=RN0XF9qQB6M

  11. Boiling Point • At what temperature did the water boil? • 100o Celsius • Did the water continue to get hotter the longer you let it boil? • No • Once the water boils, it will not get any hotter – it will continue to boil until it all the liquid changes into a gas

  12. 100 Boiling Point Water boils at ____ degrees Celsius • On your handout, use a marker to color in the temperature at which water (a liquid) boils or becomes a gas on the “Boiling Point” thermometer Water is a liquid that changes to a gas when it boils.

  13. Heating Chocolate • What happens to chocolate when we heat it? • Is the chocolate chip a solid or liquid? • It’s a solid • Place one chip on your spoon and hold it over the candle for about 45 seconds • Use your tooth pick to poke it

  14. Heating Chocolate • What happens to chocolate when we heat it? • Is the chocolate chip a solid or liquid AFTER heating? • It’s turning into a liquid • Did it boil or change into a gas? • NO

  15. Water boils at 100o C

  16. Does it change into a gas? Yep! Yep! Yep!

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