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Gizmos
Name: Avery Libbey
Date: 1/15/25
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, new substances is being created. I
know this by color change , temp change , and
the bubbles, where gas is escaping.
2. Suppose this was done on top of a balance. Do you think the
mass 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? The mass wouldn't change because the gas stays
sealed & can't escape.
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 water bubbled & fizzed and
the mass decreased from 388g
387.9 g.
2. Do you think a chemical reaction has taken place? Explain. Yes because the
bubbles & mass change is a sign of a chemical reaction.
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