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By the end of this lesson, students will be able to explain and demonstrate the Law of Conservation of Mass in chemical reactions.

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I can:
1. Define the Law of Conservation of Mass
2. Identify examples of mass conservation in everyday life
3. Analyze data to support the law

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How does mass behave during chemical reactions?

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Law of Conservation of Mass - The amount of matter does not change during a chemical reaction, only that the atoms are rearranged to form new substances. This is evidenced in a balanced chemical equation.

mass - The amount of matter in an object.

reactants - The starting materials that participate in a chemical reaction. Reactants are always written on the left side of a chemical equation

products - The new substances formed due to that reaction. Products are always written on the right side of a chemical equation

chemical reaction - A process in which one or more substances, also called reactants, are converted to one or more different substances, known as products.

open system - A container where matter (like chemicals) and energy (like heat) can freely enter and leave the system.

closed system - A container where no matter can enter or leave, but energy can still be transferred in or out of the system.

conserved - The amount of a substance (like mass) remains the same during a chemical reaction

transformed - A chemical process that changes the composition, state, or organization of matter.

balanced chemical equation - the number of atoms of each element on the reactant side of a chemical reaction is the same as the number of atoms of each element on the product side.

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Begin with a simple demonstration: Mix baking soda and vinegar in a sealed plastic bag. Weigh before and after the reaction. Discuss observations.

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Explain the Law of Conservation of Mass: In a closed system, the total mass of substances does not change during a chemical reaction.

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What Is The Law of Conservation of Mass | Properties of Matter | Chemistry | FuseSchool

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Teacher: Direct Instruction - Small Group #1

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Teacher: Direct Instruction - Small Group #1

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We will read the article and discuss the Law of Conservation of mass. After we read, we will complete the linked handout together, then you will practice with your group. Handout

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1. Define the Law of Conservation of Mass in your own words.
2. Explain why the mass stayed the same in our experiments.
3. Predict what would happen if we opened the container during a reaction.

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End-of-lesson quiz covering:
- Definition of the Law of Conservation of Mass
- Examples of mass conservation
- Interpreting experimental data
- Balancing simple chemical equations

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In small groups, students discuss:
1. What was the most surprising thing you learned today?
2. How does the Law of Conservation of Mass relate to our everyday lives?
3. What questions do you still have about mass conservation?

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Students complete a 3-2-1 reflection on Padlet:
3 things they learned
2 things they found interesting
1 question they still have

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Complete the PhET simulation 'Balancing Chemical Equations' and screenshot your results. Go to the Game

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How do you know if a chemical equation is balanced? What can you change to balance an equation? Play a game to test your ideas!

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Find and photograph 3 examples of chemical reactions in your home or neighborhood. Explain how the Law of Conservation of Mass applies to each.

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Create a comic strip or infographic explaining the Law of Conservation of Mass to a younger student.

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Create a TED Talk that explains the Law of Conservation of Mass to 6th graders. Include visuals that show the Law of Conservation of Mass in our daily lives.

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https://docs.google.com/presentation/d/1qzTjQp7MLJOaZcGyFdT-ye5M-BlHLRbpN4rKr5P1bC8/edit?usp=drive_link

Choose 2 topics from the board to complete.

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Choice Board Law of Conservation of Mass

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Make a copy of this presentation. Use headphones to listen to the videos and read the text. Respond to questions on the slides by creating a text box.

https://docs.google.com/presentation/d/1pZjhHmoeGlBG8RrI_kn1pSZ0aJz5R1wcndhwvnjUKuc/copy.

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Practice balancing chemical equations using this interactive online tool. Start with simple equations and progress to more complex ones.

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Welcome to It's Elemental - Balancing Act! The computer will give you a number of incomplete chemical equations. Balance the chemical equations by selecting coefficients from the pull-down menus. Once you think the equation is balanced, press the 'Check my answer!' button. Have fun and good luck!

Other games based on the Table of Elements are available.

A JavaScript enabled web browser is required.

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Practice balancing chemical equations with this game!

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Download the handout and follow directions to complete the assignment on Ck12 Science.

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2022 CHEMICAL REACTIONS AND CONSERVATION OF MASS COMPUTER LAB

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Watch this video!