Conservation of Mass Lab Question: Does the weight of a substance change, after 2 chemicals undergo a chemical reaction? Hypothesis: If reactants go through a chemical reaction, than the mass should decrease in size. This is because when 2 substances are put together, heat, a gas or other things may be let out because of exothermic reactions. When the thing is let out, it loses weight. For proof, see added sheet. Background: I- A chemical reaction is between 2 reactants that react with each other to form 1 or more products. Also it is a change in the arrangement of Atoms and Molecules to make substances with different chemical compositions. II- The law of the Conservation of Mass states that in a chemical reaction the total mss of the reactants is always equal to the total mass of the products. This means that whenever a chemical reaction takes place, the atoms are not changed, they are just re-arranged. Molecules are broken apart, and new molecules form. Materials Chemicals: � Iron (III) chloride solution (3% or 0.2 mol/L) � Sodium hydroxide......

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