Student Exploration: Chemical Changes
Vocabulary: acid, base, catalyst, chemical change, coefficient, conservation of matter,
decomposition, dissolve, double replacement, endothermic, exothermic, indicator, ion, physic
...
Student Exploration: Chemical Changes
Vocabulary: acid, base, catalyst, chemical change, coefficient, conservation of matter,
decomposition, dissolve, double replacement, endothermic, exothermic, indicator, 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?
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