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?
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
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