INTERACTIVITY Perform a virtual experiment to compare the masses and colors of reactants and products Mass Conserved Figure 4

Question

INTERACTIVITY Perform a virtual experiment to compare the masses and colors of reactants and products Mass Conserved Figure 4 Iron and sulfur react to form iron sulfide The masses of the reactants and the products are shown on the first set of scales The second set of scales shows the masses of two liquid reactants Fill in the expected mass of the liquid products for this second reaction Law of Conservation of Mass When reactants form new products the new products always have the same amount of matter as the reactants During a chemical reaction matter is neither created nor destroyed This is the law of conservation of mass All atoms that are pres ent at the beginning of a chemical reaction are present at the end of the reaction Even though products may have different properties and may look and behave very differently from the reactants the total mass does not change This is why coeffi cients are used to balance equations For example in the reaction such as the one that produces iron sulfide the sum of the masses of iron and sulfur equals the mass of the iron sulfide they produce Figure 4 An atom of iron bonds with an atom of sulfur and the masses of the individual atoms combine when they form molecules If there is more iron than can bind with sulfur or more sulfur than can bind with iron the leftover reactant will still be present as will its mass NO 80 5 Fe S FeS 80 328 220 READING CHECK Integrate With Visuals Explain how the masses on the scales in Figure 4 demonstrate the law of conservation of mass

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