Manipulating Phase Changes
Fourth grade Chemistry lesson
Liaison: Sudhir Vora
Date: 11/10/97
Group Members: Amy Mecklenburg, Frankie Perez
School: Peabody
Teacher: David Walsh
Materials:
candle
lighter
cups (2 for each pair of kids)
salt
ice
spoons (2 for each pair of kids)
Procedure:
• So far, we have talked about the three states of matter: solid, liquid and gas. Does anyone remember some properties of gases that we discussed last week?
• compressible, take up space, oxygen, an example of a gas, is present in the air and it can react with apples
• This week, we are going to talk about phase changes. We will be discussing how a solid become a liquid (melting water), a liquid becomes a gas (water to steam), a solid become a gas (dry ice) and a liquid becomes a solid (freezing water). We will also talk about what causes these phase changes. Can you think of any examples of when a solid become a liquid, etc.? We will be doing an experiment to find out what affects phase changes and how we can bring them about and why they happen in the first place.
• GAME: States of matter
Each person stands up and is representative of a water molecule. If you are a solid, you move very little. A liquid state moves faster and a gas state moves about very fast. We will call out a different state of matter and before going from not moving at all to moving very fast (solid to gas), a person must go through a PHASE CHANGE, just like water does.
• DEMONSTRATION: burning candle as an example of phase changes
We must supply heat to get a solid candle to become a liquid (which burns in a chemical reaction, a byproduct of which is light) which becomes a gas. The heat makes the molecules move faster. When ice melts and becomes water, the ambient (environmental) air temperature supplies this heat. Bec
Evaluation:
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