Chemistry_Chem_Changes_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 d... icator, 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? Yes, because the bubbles give off the idea that something new is forming when the chemicals are mixed. 2. Suppose this was done on top of a balance. Do you think the mass would change as the reaction proceeded? Yes, the mass would change. 3. What do you think would happen to the mass if the reaction took place inside a sealed plastic bag? The mass would increase due to the fact that 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. Name: Date: 1. Click Play ( ). What do you observe? [Show More]

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