Chemical reactions
Chemical reactions

Chemical reactions

I can explain how atoms and mass are conserved in chemical reactions.

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In this lesson, students will learn the law of conservation of mass and how that is applied to chemical reactions.



Learning objective

Students will be able to explain how atoms and mass are conserved in chemical reactions.


Students will discuss the differences between chemical and physical changes and jot down their thoughts.


Explain that a chemical reaction occurs when one or more substances change into different substances. When this happens, students may notice a color change, change in energy, or new odor. Go over a few examples. Next, students will look at diagrams of chemical reactions at the atomic level. They will determine how many hydrogen and chlorine atoms are present before and after the reaction.

Explain that the law of conservation of mass states mass (matter) cannot be created or destroyed. Students will be presented with another chemical reaction and predict the number of atoms on the product side of the equation.


Students will respond to ten true/false and multiple-choice questions.


Students will recall what they learned in the lesson and fill out an exit slip.

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