Matter conserved after physical/chemical changes
I can explain how the total weight of matter is conserved.
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General
In this lesson, your students will learn about the Conservation of Matter. Regardless of the type of change that occurs when heating, cooling or mixing substances, matter can not be destroyed. The class will discuss physical changes versus chemical changes in matter. They will finish the lesson with a fun, yet simple experiment activity, to see if melting ice in water causes a change in the total weight of matter.
Standards
5-PS1-2
Learning Objective
Students will be able to demonstrate an understanding that the total weight of matter is conserved, regardless of the type of change that occurs when heating, cooling, or mixing substances.
Introduction
Introduce this lesson with an attention-grabbing photo: A glass of water, books, and study materials. Discussion questions to follow: “Someone left a glass of water. When they came back a day later, there was less water in the glass! What do you think happened to the rest of the water?” “Does matter ever just go away?”
Instruction
The lesson continues with a review of how matter can change between different physical stages. Present a diagram of the six ways matter changes from one phase to the other. (cycle) Students will then complete a labeling activity to check their understanding of this cycle. Next, discuss physical changes of matter, as well as chemical changes. Have the class complete an activity in which they sort changes into physical or chemical. Reinforce the concept of the Conservation of Matter with a discussion of both physical and chemical changes and the way in which matter weighs the same after each type of change.
Quiz
Students respond to ten multiple-choice and true/false questions.
Closing
Close the lesson with a simple experiment to see if melting ice in water causes a change in the total weight of matter.
Instruction materials
Students will need the following items for the closing activity:
Plastic cup
Water
Cube of ice
Scale
Paper/pencil to record results
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