Law of conservation of mass
I can describe how matter and mass are always conserved during chemical reaction
8,000 schools use Gynzy
92,000 teachers use Gynzy
1,600,000 students use Gynzy
General
In this lesson, students will learn about how mass stays through a chemical reaction. They will complete a lab with the lesson.
Standards
NGSS: MS-PS1-5
Learning objective
Students will be able to describe how matter and mass are always conserved during chemical reactions.
Introduction
Students will reflect on a before-and-after picture of a fire. What happens when wood burns? Describe what happened to the log? Where did it go?
Instruction
Students will discuss the definition of conservation of mass during chemical reactions. They will review examples of where this takes place in the real world and on the molecular level. They will then do a quick lab that demonstrates this concept. Students will use a balance to find the mass of an Alka Seltzer tablet and amount of water in a plastic bag. Then students will place that tablet in the bag and make observations.
Closing
Students will recall what they learned by explaining how mass is conserved in a chemical formula.
Instruction materials
Students will be split into groups of 2-4. Each group needs:
- 1 paper/plastic cup
- zip-lock bags
- water
- graduated cylinder
- 2-3 tablets of Alka Seltzer
- electronic balance
Students can use the handout (linked on Slide 10) to complete the lab.
The online teaching platform for interactive whiteboards and displays in schools
Save time building lessons
Manage the classroom more efficiently
Increase student engagement
Discover more!
About Gynzy
Gynzy is an online teaching platform for interactive whiteboards and displays in schools.
With a focus on elementary education, Gynzy’s Whiteboard, digital tools, and activities make it easy for teachers to save time building lessons, increase student engagement, and make classroom management more efficient.