Investigate the Law of Conservation of Mass by measuring and comparing the mass of a substance before and after a change of state.
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Balance chemical equations to show how the total number of atoms for each element does not change in chemical reactions and as a result, mass is always conserved in a closed system. (Law of Conservation of Mass.)
Using a model in which matter is composed of particles in motion, investigate that when substances undergo a change in state, mass is conserved.
Compare and contrast physical change vs. chemical change. Analyze the properties of substances before and after substances interact to determine if a chemical reaction has occurred.
Explain that chemical changes occur when substances react and form one or more different products, whose physical and chemical properties are different from those of the reactants.