Student Objective Define and explain what is meant by boiling & melting. Warm Up What does “melting” mean?

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Presentation transcript:

Student Objective Define and explain what is meant by boiling & melting. Warm Up What does “melting” mean?

melting When matter changes from a solid to a liquid. Vocabulary: *Add this to your vocabulary page.

melting point The temperature at which a solid changes into a liquid. Add to sentence box for melting point: Ice’s melting point is 0°C More Vocabulary:

Daily applications of melting point….

Kettles Water boils in a kettle at 100 degrees Celsius. The materials used to make the kettle must have a melting point higher than the boiling point of water. If they did not the kettle would melt before the water boiled.

Electric Light Bulb If you look at an electric light globe you will see a thin wire inside the glass. When the electric current flows through the globe this wire heats up and glows. The wire must have a very high melting point so that it glows but does not melt!

DIRECTIONS: 1. Go to the site below and find out about “melting”. 2. READ the information about Melting 3.Answer Question 4 (at the bottom of the screen) and then click “Show Answers”. 4. Then copy the correct answers from Question 4 onto your worksheet. CLICK HERE TO BEGIN

boiling point? The temperature at which a liquid changes into a gas. Add to sentence box: Water’s boiling point is 100° C VOCABULARY (Add to Vocab. Paper in binder)

DIRECTIONS: 1. Go to the site below and find out about “boiling”. Click Here What are materials made of? Boiling 2. READ the information about Boiling 3.Answer Question 5 (at the bottom of the screen) and then click “Show Answers”. 4. Then copy the correct answers from Question 5 onto your worksheet. What are materials made of? Boiling

What is this animation showing? Click on the beaker to find out…. This animation shows how water molecules are able to break the forces of attraction to each other and escape as the gas molecule. This is what is happening inside the gas bubble as it is rising to the surface to break and release the water gas molecules

Conclusions (Part 1): Answer on your notebook paper in Notes Section. Name a specific solid that has a high melting point. Name a specific solid that has a low melting point.

What is “freezing”?

VOCABULARY (Add to Vocab. Paper in binder) Freezing – when a liquid changes to a solid Add to sentence box: *Water’s freezing point is 0°C

BOILING VS EVAPORATION Boiling is when a liquid changes to a gas… Evaporation is also when a liquid changes to a gas… Do NOT write this on your paper!

WELL, WHAT IS THE DIFFERENCE, THEN? (Answer the questions on the next slide to find out.)

1. What is EVAPORATION? Look it up in the textbook glossary & add it to your worksheet (on the back) & vocab. section of your binder. 2. What is BOILING? Look it up in the textbook glossary & add it to your worksheet & vocab. section of your binder. 3. Then, explain how evaporation and boiling are different. 4. Then draw the pictures below (on your worksheet) to show evaporation and boiling.

EVAPORATION and BOILING are both types of “vaporization” because the liquid changes to a gas or a “vapor”. The difference is EVAPORATION occurs only at the surface of the liquid but BOILING occurs both throughout the liquid and at the surface. (Fix your answer for #3 if you need to.) Look at the diagram of boiling and notice how the gases (bubbles) are formed all throughout the water..

Answer the following using your textbook. Write the QUESTION & answer in your notes section of your binder. Use pgs to help you answer the following questions. 1.What happens to the particles of a solid as it becomes a liquid? 2.What is vaporization?

Discovery Education Esc powerpoint Double click on “Computer” Double click on “Student Apps R” drive Double click on “Discovery” Click on “Assignments” tab Click on “Hot and Not So Hot” & complete worksheet using interactive virtual lab

Viscosity: a liquid’s resistance to flowing Add to sentence box: *high viscosity = flows slowly, low viscosity = flows quickly Click on the picture below. Test different liquids, using the same temperature for both liquids. (You can change the temp., just change both of them to the same thing. Vocabulary!! (Add to your vocab. Paper)