Wednesday 1/26/11 Melting Wax and Sugar DateActivityPage 1/26Melting Wax and Sugar
Today’s Content Objectives 1.We will investigate whether or not sugar and wax melt completely. 2.We will learn that freezing is when liquids change state to solids.
Today’s Language Objectives 1.We will read and follow instructions given about the experiment. 2.We will record data and write answers to questions. 3.We will discuss our results.
Today’s Group Objectives 1.We will work in our table group to complete the experiment, analyze the data and respond to the questions in writing and in discussion.
Wax and Sugar Melting Most of us saw wax melting, but sugar did not melt. Do you think sugar can melt? What would we need to do to determine whether or not sugar can melt?
Today’s Experiment We will conduct an experiment to determine whether wax and sugar melt using a candle.
Safety: Flame is approx C!!! Remove papers from area where candle is set. Roll up sleeves. Long hair should be secured. Avoid touching the hot spoons and the melted materials. Wear goggles as long as the candle is lit.
Set Up: Job Assignments 1s—gets the tub, hands out safety glasses 2s—makes aluminum spoon 3s—makes aluminum spoon 4s—gets sugar and wax
Clean Up: Job Assignments 1s—puts safety glasses in tub 2s—throws away aluminum spoons 3s—returns paper cups to teacher 4s—checks tub with teacher, returns tub to its spot
What does the word melt mean? Melting is a change of state from solid to liquid
Did the wax melt? What is your evidence? Yes. The wax changed from a solid to a liquid.
Did the sugar melt? What is your evidence? Yes. The sugar changed from a solid to a liquid.
Did the melted wax and sugar stay liquid? No, they both changed back into solids.
Note: Freezing When liquids change state from liquid to solid.
Did the melted wax and sugar freeze? Evidence? Yes. They changed from a liquid to a solid.
Do all solids melt? How would you find out? Heat them until melt or something else happens.
Do all solids melt at the same temperature? No. Each element has its own melting temperature.
Do all liquids freeze at the same temperature? No. Water freezes at 0 C, and wax and butter are solid at room temperature.
How could you find out if all liquids freeze? Cool them until they freeze or something else happens.
When wax melts, how do the particles change? The wax particles don’t change; they stay wax particles. The amount of KE they have changes.
Why do materials melt when they get hot? Heat energy transfers to particles. KE of particles increases until they start to move over and around one another.
What happens at the particle level when a material freezes? KE of particles decreases until they stop moving over and around one another.
Why is the wax around the wick of your candle solid now? Energy transferred from the wax to the surrounding air. The KE of the particles decreased until the particles stopped moving over and around each other. When they stopped moving, the wax froze.