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ChemicalChanges gizmo

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Student Exploration: Chemical Changes Vocabulary: acid, base, catalyst, chemical change, coefficient, conservation of matter, decomposition, dissolve, double replacement, endothermic, exothermic, in ... dicator, ion, physical change, product, reactant, single replacement, subscript, synthesis 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? Oxygen (or a type of gas) is being produced because there are bubbles forming. 2. Suppose this was done on top of a balance. Do you think the mass would change as the reaction proceeded? Why? Yes, the mass would change because gas is produced. 3. What do you think would happen to the mass if the reaction took place inside a sealed plastic bag? The mass would increase since nothing would be able to evaporate and everything would build up in a sealed space. 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? The solution produced smoke. Do you think a chemical reaction has taken place? Explain. Yes, due to the fact that the solution started to fizz and produce smoke after being introduced to the sodium [Show More]

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