Conceptual Explanations Solid Liquid Gas

Concepts:

Understanding the change of a solid to a liquid:

Children will learn how a solid can change to a liquid. They will address this task by melting the chocolate to a liquid form. They will be able to actually see the chemical change when they add hot water to the chocolate. They will also elaborate on this concept by thinking of other substances that can melt into a liquid form. (i.e. frozen soup to liquid soup when it defrosts)

Understanding the change of a liquid to a gas:

Children will learn how a liquid changes into a gas form. They will be able to see the change from a liquid to a gas when the hot water creates steam. Through experimentation, they will be able to make a liquid into a gas.

Understanding the change of a gas to a liquid:

During the experiment, the children will cover the top of their cup with a napkin, resulting in the gas changing back to the liquid state. The children can do this multiple times to ensure that they understand that substances can change from one state to another. Through discussion, they can relate these changes to our weather system. They can see how ice melts, the water evaporates turning into a vapor, and eventually returns to the liquid state when it rains. When they repeat this step in the experiment they can see how it is a cycle and how water continuously changes its form. (solid, liquid, gas)

Understand the effects of adding heat to a substance:

The children will see the difference of cold water and hot water and how it affects the chocolate. Relating this to every day events can ensure their conceptual understanding of the effects of adding heat to something. A starting point would be adding heat to water.

What chemical change is, and how it affects the material when it changes:

The children will understand that the change of a substance is a result of a chemical change. They will understand that substances physically change when they are melted and evaporated. They will not necessarily fully understand how the specific chemical change takes place, but they will understand that there is an actual change to the substance when it goes from one form to another.

Understand where changes occur in everyday life, other examples of matter changes:

During the lesson, they made lists of other things that change form. Through discussion and exploration the students will be able to recognize when a substance is changing form, and a chemical change is occurring.

Develop an understanding of where chocolate came from and what it is:

The students will not memorize the facts given about chocolate, but they will have a basic understanding of where chocolate came from. They will be able to use the poster to remind themselves the facts about chocolate and having discussions will help them remember some of the history of chocolate.

Be familiar with the history of chocolate:

The students will know the history of chocolate, where it came from. They will also gain the tools to research their own curiosity about history, and chocolate. They will be taught the skills of researching a topic. They will be able to find their own discoveries about chocolate and be able to share with others.

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