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Insoluble means that the solid will not dissolve. Tell students that a precipitate is an insoluble solid that forms when two solutions are combined and react chemically. Why or why not? Combining the two clear colorless liquids is a chemical change because a different solid substance is formed. Ask students: Would you consider adding a sodium carbonate solution to a magnesium sulfate solution a chemical reaction? Yes.
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Hold up the two clear colorless solutions and slowly pour the smaller amount into the larger. Pour 50 mL of water in another clear plastic cup and add 5 g (about 1 teaspoon) of sodium carbonate.Pour 100 mL of water in one clear plastic cup and add 10 g (about 1 tablespoon) of magnesium sulfate.Engage Do a demonstration by combining two clear colorless solutions that produce a white solid and introduce the term precipitate.Follow all safety precautions regarding use, storage, and disposal of copper II sulfate. Measuring spoon (½ teaspoon) or balanceĬopper II sulfate is available from various chemical suppliers, including Sargent Welch, Product #WLC94770-06 or Flinn Scientific, Product #C0110.Sodium carbonate is Product #WLC94291-06 or #S0052. Follow all safety precautions regarding use, storage, and disposal of copper II sulfate and sodium carbonate. SafetyĬopper II sulfate is available from various chemical suppliers, including Sargent Welch, Product #WLC94770-06 or Flinn Scientific, Product #C0110. The activity sheet will serve as the “Evaluate” component of each 5-E lesson plan.
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Evaluationĭownload the student activity sheet, and distribute one per student when specified in the activity. Students will also be able to explain that this definition applies to the production of a solid called a precipitate. Students will be able to explain that for a chemical reaction to take place, the reactants interact, bonds between certain atoms in the reactants are broken, the atoms rearrange, and new bonds between the atoms are formed to make the products. They will make the connection between the chemical equation and the real substances and see that the solid and gas produced in the actual reaction are also in the products of the equation. Students will analyze the chemical equation for the reaction and see that all atoms in the reactants end up in the products. Students will combine two clear colorless solutions (baking soda solution and calcium chloride solution) and see the formation of a solid and a gas.