Student Exploration: Chemical Changes
Vocabulary: acid, base, catalyst, chemical change, coefficient, conservation of matter, decomposition,
dissolve, double 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?
2020
When the Sodium is put inside the water container, there is a c
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Category | GIZMOS |
Pages | 12 |
Language | English |
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