Conservation of Mass Lesson Plan:
Next Gen Science Framework:
Outline:
MS-PS1: Chemical Reactions. Conservation In this lesson, students will learn the
Of Mass
difference between physical and
chemical changes and their relationship
“The amount (weight) of matter is
to the Law of Conservation of Mass. The
conserved when it changes form, even in
major concept that students should learn
transitions in which it seems to vanish (e.g., is that mass is conserved when
substances undergo a physical or
sugar in solution, evaporation in a closed
chemical change (Law of Conservation of
container).”
Mass).
Lesson Objectives:
-
-
Students will know the difference
between a physical change and a
chemical change.
Students will be able to design an
experiment to determine the effect
on mass when a substance undergoes
either a physical change or a
chemical change.
Students will understand that mass is
conserved when substances undergo
physical and chemical changes (The
Law of Conservation of Mass).
Keywords:
•
•
•
•
•
•
Mass
Matter
Open System
Closed System
How to use a triple beam balance
Law of Conservation of Mass
1. Activation Phase (10 minutes):
- Teacher-Student Talk: “What will happen to things when they are burned?
- Experiment: Burning wire wool on a scale. Weight will go up.
- Cognitive Dissonance: Burning things doesn’t make them disappear, the weight can
even get higher.
2. Main Phase (25 minutes):
- What is burning? Chemical reaction with oxygen. à Chemical Change
- What is the difference of a chemical reaction to physical change?
- Explaining the law of conversation of mass. Experiment sugar in water.
3. Consolidation Phase (10 minutes)
- How can we design an experiment that proves, that the mass is conserved when
burning wire wool?
- Homework: Name 5 chemical and 5 physical changes you know from your daily
life.