Does the law of conservation of mass apply to chemical changes? Explore this question with Sabrina Cruz. During a chemical change, two or more reactants rearrange to form new products. There are several clues that identify a chemical reaction is taking place, such as change in temperature, bubbling, and a flash of light. No matter what state the matter is in, if you add up the mass of all the products, it will always equal the mass of all the reactants. Thus, during chemical changes, mass is always conserved.
This video also features demonstrations that will help the students observe how the law of conservation governs chemical changes.
This video satisfies the 5-PS1-2 requirement of fifth-grade science proficiency.
Students who demonstrate understanding can: 5-PS1-2. Measure and graph quantities to provide evidence that regardless of the type of change that occurs when heating, cooling, or mixing substances, the total weight of matter is conserved.