Chemistry > GIZMOS > Chemical Changes Nevada Virtual Academy - CHEMISTRY 304 (All)

Chemical Changes Nevada Virtual Academy - CHEMISTRY 304

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Student Exploration: Chemical Changes Prior Knowledge Questions (Do these BEFORE using the Gizmo.) 1. A student mixes baking soda and vinegar in a glass. The results are shown at left. Do you think ... any new substances are being created in this mixture? If so, how do you know? Yes I do belive that new substances are being formed because there is a chemical reaction between the baking soda and vinegar turning it into a bubbly substances instead of a powder and liquid. 2. Suppose this was done on top of a balance. Do you think the mass would change as the reaction proceeded? Yes 3. What do you think would happen to the mass if the reaction took place inside a sealed plastic bag? I don’t think anything would happen because this reaction needs oxygen. Gizmo Warm-up A chemical change, (or chemical reaction) occurs when one or more substances, called reactants, are transformed into different substances, or products. In the Chemical Changes Gizmo, you will look for evidence of chemical changes by looking at changes you can see, touch, or smell. To begin, check that Reactant 1 is Sodium and Reactant 2 is Water. Sodium is a metal so soft you can cut it with a knife. 1. Click Play ( ). What do you observe? I noticed that the mass decreases and the sodium dissolves in the water. 2. Do you think a chemical reaction has taken place? Explain. Yes because the salt has changed permanently now that it has been dissolved there is no changing it back to a solid. [Show More]

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