Summary

Student Exploration: Chemical Changes gizmos

Student Exploration: Chemical Changes Vocabulary: acid, base, catalyst, chemical change, coefficient, conservation of matter, decomposition, dissolve, do uble replacement, endothermic, exothermic, indicator, ion, physicalchange, 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 resultsare shown at left. Do you think any new substances are being created in this mixture? If so, how do you know? Yes, because, as shown in the image, there are bubbles,therefore gas is being released, which are characteristics of a chemical change. 2. Suppose this was done on top of a balance. Do you think themass 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? Then, the mass would not change, because the gases being released in the reaction are being collected Gizmo Warm-up A chemical change, (or chemical reaction) occurs when oneor 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? download full paper here