Explain Discuss the products produced in this chemical reaction.These products seem to be different from the reactants. Why? The two substances that were combined were liquids and the substances that were produced were a solid and a gas. Do you think this was a chemical reaction? Yes. The white particles appeared after the two solutions were combined. Ask students: What did you observe when you mixed the baking soda solution and the calcium chloride solution? The solutions bubbled and little white particles of solid formed. Try not to pour in any undissolved baking soda. There may be some undissolved baking soda remaining in the bottom of the cup.Ĭarefully pour the baking soda solution into the calcium chloride solution. Swirl until as much of the baking soda dissolves as possible. Add 2 g (about ½ teaspoon) of baking soda to the water in its labeled cup.Swirl until as much of the calcium chloride dissolves as possible. Add 2 g (about ½ teaspoon) of calcium chloride to the water in its labeled cup.Use a graduated cylinder to add 20 mL of water to each cup.Use masking tape and a pen to label 2 plastic cups baking soda solution and calcium chloride solution.Note: If you would like students to practice using a balance to weigh grams, have them weigh two grams each of baking soda and calcium chloride. How do you know when a precipitate is formed in a chemical reaction? Materials for Each Group Explore Have students combine two liquids to observe another precipitate.Look at the teacher version of the activity sheet to find the questions and answers. The Explain It with Atoms & Molecules and Take It Further sections of the activity sheet will either be completed as a class, in groups, or individually, depending on your instructions. Students will record their observations and answer questions about the activity on the activity sheet. 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. Hold up the two clear colorless solutions and slowly pour the smaller amount into the larger. ![]()
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